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From the source to the registers.
The term “heat pump” refers to any system that can extract heat from a colder space and transfer it to a warmer one. For example, refrigerators use heat pumps to remove heat from inside the fridge and expel it into your kitchen. Air conditioners use heat pumps to remove heat from inside the house and dump it outside. In this guide, the phrase “heat pump” refers specifically to HVAC equipment that is capable of both heating
and cooling the air inside a home. In other words, we’re talking about air conditioners that can also run in reverse, pulling heat from outside on a winter day and pumping it inside.
We’ve created this guide because when it comes to getting off fossil fuels, it does matter what you replace them with. Climate advocates tout electric heat pumps because they can create two to three times more heat per unit of energy than other heating equipment. Electric resistance heating, by contrast, is extremely wasteful, and if people start installing those systems en masse, that could actually increase emissions in the near term and make it more difficult to decarbonize the economy in the long term. By getting a heat pump, you won’t just be cutting emissions, you’ll be reducing the cost of cleaning up the electric grid because we’ll need less electricity overall.
That said, a poorly designed or installed system can negate many of the benefits that heat pumps have to offer. Whether you’re reading because you want to cut emissions, or save money on energy, or take advantage of the steady, quiet comfort heat pumps provide, it’s essential to do your homework and find a good contractor to work with. In this guide, we’ll cover how to know when it’s the right time to get heat pumps, the basics of understanding what your options are, common misconceptions about heat pumps, how to find and vet contractors, and more.
Larry Waters is the founder and president of Electrify My Home, a heating and air conditioning contractor in Northern California that specializes in heat pumps. Waters has worked in the HVAC industry for more than 40 years.
D.R. Richardson is the co-founder of Elephant Energy, a Boulder, Colorado-based startup that helps homeowners in Colorado and Massachusetts electrify by using building science and proprietary software to ensure good system design, and by managing all aspects of the project.
Jake Marin is the senior emerging opportunities manager for VEIC, a clean energy nonprofit that administers Vermont and D.C.’s energy efficiency programs among other decarbonization work across the country. Marin ran VEIC’s HVAC program for nearly 8 years and was recently given a “Champion of Energy Efficiency” award for his pioneering work bringing heat pumps to Vermont.
There are many, many kinds of electric heat pumps used for space heating and cooling. At a high level, there are two main categories that homeowners can typically choose from:
Within each of these are a handful of installation options:
The above designs aren’t mutually exclusive. You can install a system that’s fully ducted, fully ductless, or a combination of both. You can also combine a heat pump system with a fuel-burning furnace or boiler, known as a dual-fuel system. If aesthetics are important to you, there are also companies like Quilt that offer versions that can better integrate into the look of your home.
“Ductwork in unfinished space is easy. Ductwork in finished space is so expensive and hard that we typically don't recommend it,” said Richardson.
Heat pumps also come in models with different “speeds” or “stages”:
There are also some technical specifications to be aware of, such as seasonal efficiency ratings:
The highest rated SEER2 device may have a lower HSPF2 rating, while the highest rated HSPF2 device may have a lower SEER2 rating.
Finally, heat pumps also come in many different sizes. Having a properly sized system is one of the most important factors for ensuring your heat pumps run efficiently and last a long time.
A good contractor will be able to walk you through different system designs and equipment options to find the answer that’s best suited to your house, your goals, and your budget.
“There’s a lot of companies out there that offer just what they have in the catalog and their salespeople can’t sell anything outside of that,” Waters told me. “That means the customer is going to get matched with that cookie cutter option if they go with that company. So how to choose a contractor is one of the most important things.”
Many people are used to setting their HVAC systems to different temperatures at different times of day — one temp for the morning and evening, another for when they leave for work, and another for bedtime. This makes sense with many furnaces and air conditioners because they’re usually designed to cycle on, blast hot or cold air at full capacity until they achieve the temperature you want, and then turn off, so turning down the system when you’re not home can save a lot of energy. But the most efficient “variable speed” heat pumps work differently — they use a lot of energy to reach a certain temperature, but once they hit it, they sip small amounts of energy to maintain it. Experts say a “set it and forget it” approach will give you the most efficient performance and the most consistent energy bills.
“Don’t worry about the number,” says Marin. “Just find your comfortable temperature, and then leave it alone, forget it’s even there.”
This topic can be divisive among HVAC experts, but in most of the continental U.S., you should be able to find a heat pump solution that will heat your home efficiently on the coldest winter days. The key is that the system has to be sized correctly. Richardson’s company, Elephant Energy, works in Colorado, where he says they’ve had two years in a row with days that got down to -13 degrees Fahrenheit, “and our fleet of hundreds of heat pumps have cranked out heat to keep homes nice and warm on those coldest days.”
There still may be scenarios where you
want to keep your furnace as a back-up, even if it’s not strictly necessary.
If you’re switching from fuel oil, propane, or electric resistance heating, you’re pretty much guaranteed to save money on your bills with heat pumps. But if you’re switching from natural gas, it really depends on where you live.
Richardson says that for a lot of his customers in Colorado, making the switch from gas to inverter heat pumps is cost neutral — they end up paying a bit more for heating in the winter but less for cooling in the summer, since the heat pump is often more efficient than whatever air conditioning they were replacing. At the same time, those who don't have air conditioning to start with could end up paying a bit more year-round.
Do you…
Short answer: Hold off on a heat pump, invest in weatherization.
Long answer: You may have arrived at this guide because you’re interested in decarbonizing your home, but if you have a relatively new heating and/or cooling system, it could actually be worse, emissions-wise, to replace it, due to the embedded carbon that went into manufacturing that equipment. Unless you’re really desperate to replace your existing system for comfort or financial reasons (if you have electric resistance heaters, for example, switching to heat pumps could save you a lot of money, since they use about a third of the electricity), we recommend getting a bit more life out of it first.
In the meantime, put your enthusiasm for decarbonization into making your home more efficient. Insulating and air sealing your home before you get heat pumps will help you save money in the near term and get you the best results from heat pumps later on.
Short answer: Consider a dual fuel system
Long answer: If you really need a new air conditioning system but your heater still has a lot of life left in it, consider installing a heat pump to work alongside your existing furnace or boiler. That way, you’ll get efficient cooling capacity that will save you money in the summer, and you’ll also be able to cut down on your fossil fuel consumption in the winter. You can set the heat pump to warm your home until it gets down to a certain temperature outside, at which point your furnace or boiler will kick in. (Many heat pump models can operate in very cold temperatures, so having a backup heating system like this is not necessary, but it may be a good intermediate step in certain cases.)
Short answer: It’s the perfect time to think about heat pumps!
Long answer: HVAC equipment typically lasts for 15 to 20 years, so 10 years is probably the earliest you would want to start thinking about a replacement. It’s probably safe to wait a few years longer, but you definitely don’t want to wait until your existing system breaks to start your heat pump journey. A heat pump retrofit can be a months-long process, from finding contractors, to evaluating quotes, to refining your plan, to getting permits and scheduling the work. If you’re in an emergency situation where your boiler broke and you really need heat, you could be forced to settle for a less-than-ideal solution. At the very least, start your research now and consider weatherization upgrades.
Short answer: Get a mini-split!
Long answer: Ductless mini-split heat pumps are a no-brainer to provide heating and cooling to a single room or zone. They can be very affordable — and in some cases free — with rebates and tax credits. If you want to retrofit the rest of your home to use heat pumps down the line, this will help you get familiar with the technology and will not preclude you from adding more later — though it is helpful to tell your contractor that now so they can take it into account.
Heat pumps can be a major investment. If you just want to add heating or cooling capacity to one or two rooms, it can cost $5,000 to $7,000 per room, on average, before incentives, Richardson told me. A whole-home solution averages $20,000 to $30,000 before incentives, but depending on the home and the system design can go much higher.
Do you have some rooms that are hotter in the summer or colder in the winter than others and you want to make your home more comfortable overall? Or is your goal to get better air filtration and ventilation? Or do you simply want to get off fossil fuels? It will be helpful to think through what you want to achieve and communicate that to your contractor so they can take that into account when they design your system.
The federal government offers a 30% tax credit for heat pumps, up to $2,000, not including labor, for certain energy efficient models. (Note that you can only get the full tax credit if you have $2,000 or more in tax liability the year you install the heat pumps.) The credit can’t be rolled over to the next tax year, but you can claim it in multiple years. Your state energy office, city, or utility may offer additional tax credits or rebates.
It’s important to learn about what’s available in your area before reaching out to contractors because some rebate programs require you to work only with approved partners. Also, the contractors you reach out to might not always be up to date on the latest incentive programs, so it’s a good idea to do some independent research and make sure you find someone who knows how to help you take advantage. There is, unfortunately, not yet any single directory where you can enter your zip code and find out about every possible rebate opportunity everywhere in the country, so it’s best to check multiple sources of information:
As with all home renovation projects, we strongly recommend getting at least three quotes from different contractors.
Heat pumps are common in some parts of the country, but in others it might be difficult to find a contractor who really knows their stuff. Dip your toes in a heat pump Reddit forum and you’ll find scores of homeowners asking what to do after a contractor told them that heat pumps don’t work and they should just stick with gas. Here are a few strategies for finding high quality heat pump contractors, in order of what we recommend:
Finding the right contractor is probably the most important decision you’ll make in this entire process, and it’s not uncommon to get quotes with wildly different recommendations. Here are some questions you can ask to help you get a sense of who really knows what they are talking about and is willing to go the whole nine yards to make sure you get a properly designed system:
Manual J is a formula that helps a contractor identify the right size HVAC system for your home. It requires taking detailed measurements throughout the building, inspecting your home’s insulation and other elements that will affect airflow and heat retention, and performing tests such as the “blower door” to assess how leaky your building’s envelope is. If you’re interested in using your ductwork or installing new ductwork, they should also perform a “Manual D” calculation. Waters told me that despite these calculations being industry standards, very few contractors actually go through the trouble of doing them. “What this does, it tells us exactly what size system I need for heating and cooling, and exactly how much air goes into each room,” he said.
Richards agreed, adding that you may want to ask what technology they use to size the system. “You need somebody who has a technology-driven tool that can actually measure the heating and cooling requirements of your home,” he says. “Are you doing a true Manual J, or are you sort of sticking your finger up in the air?”
If your contractor only works with one brand of equipment, you’re more likely to get a solution that’s convenient for them rather than one that’s custom designed for you.
Waters told me the registers — the vents that release air into a given room — are critical for occupant comfort. If your existing ductwork is designed to distribute air from a furnace, your registers may be designed to push air into the middle of the room. But with heat pumps, you want the air either pushed up toward the ceiling if the vents are down low or across the ceiling if they are up high, so that the house doesn’t feel drafty and you get proper circulation.
If you’re starting with heat pumps but you eventually want to electrify your stove, your clothes dryer, or your car, your home may need an electric panel upgrade or an electric service upgrade from the utility. What you don’t want is to put in heat pumps that eat up the rest of your home’s capacity and then have to deal with pricey upgrades down the line.
The Building Performance Institute and North American Technician Excellence are two organizations that train and certify contractors, auditors, and technicians in the latest building science and best practices. A certification doesn’t guarantee you’ve found the right contractor — it could mean they know a lot about installing heat pumps but still don’t know much about the models that work in the coldest climates, for instance. But it’s a helpful data point that shows they are investing in training.
After you’ve found a contractor or company to work with, settled on a system design, and secured financing, your installer is going to need to secure permits for the work. Then you’ll need to schedule the installation, which, depending on how busy your contractor is, can take several weeks to several months. The actual work should take one to three days, depending on how complicated it is.
Also — talk to your contractor about maintenance. Be sure to clean the filters regularly and do anything else they recommend to get the best performance and longest life out of your equipment.
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And more on the week’s biggest conflicts around renewable energy projects.
1. Jackson County, Kansas – A judge has rejected a Hail Mary lawsuit to kill a single solar farm over it benefiting from the Inflation Reduction Act, siding with arguments from a somewhat unexpected source — the Trump administration’s Justice Department — which argued that projects qualifying for tax credits do not require federal environmental reviews.
2. Portage County, Wisconsin – The largest solar project in the Badger State is now one step closer to construction after settling with environmentalists concerned about impacts to the Greater Prairie Chicken, an imperiled bird species beloved in wildlife conservation circles.
3. Imperial County, California – The board of directors for the agriculture-saturated Imperial Irrigation District in southern California has approved a resolution opposing solar projects on farmland.
4. New England – Offshore wind opponents are starting to win big in state negotiations with developers, as officials once committed to the energy sources delay final decisions on maintaining contracts.
5. Barren County, Kentucky – Remember the National Park fighting the solar farm? We may see a resolution to that conflict later this month.
6. Washington County, Arkansas – It seems that RES’ efforts to build a wind farm here are leading the county to face calls for a blanket moratorium.
7. Westchester County, New York – Yet another resort town in New York may be saying “no” to battery storage over fire risks.
Solar and wind projects are getting swept up in the blowback to data center construction, presenting a risk to renewable energy companies who are hoping to ride the rise of AI in an otherwise difficult moment for the industry.
The American data center boom is going to demand an enormous amount of electricity and renewables developers believe much of it will come from solar and wind. But while these types of energy generation may be more easily constructed than, say, a fossil power plant, it doesn’t necessarily mean a connection to a data center will make a renewable project more popular. Not to mention data centers in rural areas face complaints that overlap with prominent arguments against solar and wind – like noise and impacts to water and farmland – which is leading to unfavorable outcomes for renewable energy developers more broadly when a community turns against a data center.
“This is something that we’re just starting to see,” said Matthew Eisenson, a senior fellow with the Renewable Energy Legal Defense Initiative at the Columbia University Sabin Center for Climate Change Law. “It’s one thing for environmentalists to support wind and solar projects if the idea is that those projects will eventually replace coal power plants. But it’s another thing if those projects are purely being built to meet incremental demand from data centers.”
We’ve started to see evidence of this backlash in certain resort towns fearful of a new tech industry presence and the conflicts over transmission lines in Maryland. But it is most prominent in Virginia, ground zero for American hyperscaler data centers. As we’ve previously discussed in The Fight, rural Virginia is increasingly one of the hardest places to get approval for a solar farm in the U.S., and while there are many reasons the industry is facing issues there, a significant one is the state’s data center boom.
I spent weeks digging into the example of Mecklenburg County, where the local Board of Supervisors in May indefinitely banned new solar projects and is rejecting those that were in the middle of permitting when the decision came down. It’s also the site of a growing data center footprint. Microsoft, which already had a base of operations in the county’s town of Boydton, is in the process of building a giant data center hub with three buildings and an enormous amount of energy demand. It’s this sudden buildup of tech industry infrastructure that is by all appearances driving a backlash to renewable energy in the county, a place that already had a pre-existing high opposition risk in the Heatmap Pro database.
It’s not just data centers causing the ban in Mecklenburg, but it’s worth paying attention to how the fight over Big Tech and solar has overlapped in the county, where Sierra Club’s Virginia Chapter has worked locally to fight data center growth with a grassroots citizens group, Friends of the Meherrin River, that was a key supporter of the solar moratorium, too.
In a conversation with me this week, Tim Cywinski, communications director for the state’s Sierra Club chapter, told me municipal leaders like those in Mecklenburg are starting to group together renewables and data centers because, simply put, rural communities enter into conversations with these outsider business segments with a heavy dose of skepticism. This distrust can then be compounded when errors are made, such as when one utility-scale solar farm – Geenex’s Grasshopper project – apparently polluted a nearby creek after soil erosion issues during construction, a problem project operator Dominion Energy later acknowledged and has continued to be a pain point for renewables developers in the county.
“I don’t think the planning that has been presented to rural America has been adequate enough,” the Richmond-based advocate said. “Has solar kind of messed up in a lot of areas in rural America? Yeah, and that’s given those communities an excuse to roll them in with a lot of other bad stuff.”
Cywinski – who describes himself as “not your typical environmentalist” – says the data center space has done a worse job at community engagement than renewables developers in Virginia, and that the opposition against data center projects in places like Chesapeake and Fauquier is more intense, widespread, and popular than the opposition to renewables he’s seeing play out across the Commonwealth.
But, he added, he doesn’t believe the fight against data centers is “mutually exclusive” from conflicts over solar. “I’m not going to tout the gospel of solar while I’m trying to fight a data center for these people because it’s about listening to them, hearing their concerns, and then not telling them what to say but trying to help them elevate their perspective and their concerns,” Cywinski said.
As someone who spends a lot of time speaking with communities resisting solar and trying to best understand their concerns, I agree with Cywinksi: the conflict over data centers speaks to the heart of the rural vs. renewables divide, and it offers a warning shot to anyone thinking AI will help make solar and wind more popular.
The One Big Beautiful Bill Act is one signature away from becoming law and drastically changing the economics of renewables development in the U.S. That doesn’t mean decarbonization is over, experts told Heatmap, but it certainly doesn’t help.
What do we do now?
That’s the question people across the climate change and clean energy communities are asking themselves now that Congress has passed the One Big Beautiful Bill Act, which would slash most of the tax credits and subsidies for clean energy established under the Inflation Reduction Act.
Preliminary data from Princeton University’s REPEAT Project (led by Heatmap contributor Jesse Jenkins) forecasts that said bill will have a dramatic effect on the deployment of clean energy in the U.S., including reducing new solar and wind capacity additions by almost over 40 gigawatts over the next five years, and by about 300 gigawatts over the next 10. That would be enough to power 150 of Meta’s largest planned data centers by 2035.
But clean energy development will hardly grind to a halt. While much of the bill’s implementation is in question, the bill as written allows for several more years of tax credit eligibility for wind and solar projects and another year to qualify for them by starting construction. Nuclear, geothermal, and batteries can claim tax credits into the 2030s.
Shares in NextEra, which has one of the largest clean energy development businesses, have risen slightly this year and are down just 6% since the 2024 election. Shares in First Solar, the American solar manufacturer, are up substantially Thursday from a day prior and are about flat for the year, which may be a sign of investors’ belief that buyer demand for solar panels will persist — or optimism that the OBBBA’s punishing foreign entity of concern requirements will drive developers into the company’s arms.
Partisan reversals are hardly new to climate policy. The first Trump administration gleefully pulled the rug from under the Obama administration’s power plant emissions rules, and the second has been thorough so far in its assault on Biden’s attempt to replace them, along with tailpipe emissions standards and mileage standards for vehicles, and of course, the IRA.
Even so, there are ways the U.S. can reduce the volatility for businesses that are caught in the undertow. “Over the past 10 to 20 years, climate advocates have focused very heavily on D.C. as the driver of climate action and, to a lesser extent, California as a back-stop,” Hannah Safford, who was director for transportation and resilience in the Biden White House and is now associate director of climate and environment at the Federation of American Scientists, told Heatmap. “Pursuing a top down approach — some of that has worked, a lot of it hasn’t.”
In today’s environment, especially, where recognition of the need for action on climate change is so politically one-sided, it “makes sense for subnational, non-regulatory forces and market forces to drive progress,” Safford said. As an example, she pointed to the fall in emissions from the power sector since the late 2000s, despite no power plant emissions rule ever actually being in force.
“That tells you something about the capacity to deliver progress on outcomes you want,” she said.
Still, industry groups worry that after the wild swing between the 2022 IRA and the 2025 OBBA, the U.S. has done permanent damage to its reputation as a business-friendly environment. Since continued swings at the federal level may be inevitable, building back that trust and creating certainty is “about finding ballasts,” Harry Godfrey, the managing director for Advanced Energy United’s federal priorities team, told Heatmap.
The first ballast groups like AEU will be looking to shore up is state policy. “States have to step up and take a leadership role,” he said, particularly in the areas that were gutted by Trump’s tax bill — residential energy efficiency and electrification, transportation and electric vehicles, and transmission.
State support could come in the form of tax credits, but that’s not the only tool that would create more certainty for businesses — considering the budget cuts states will face as a result of Trump’s tax bill, it also might not be an option. But a lot can be accomplished through legislative action, executive action, regulatory reform, and utility ratemaking, Godfrey said. He cited new virtual power plant pilot programs in Virginia and Colorado, which will require further regulatory work to “to get that market right.”
A lot of work can be done within states, as well, to make their deployment of clean energy more efficient and faster. Tyler Norris, a fellow at Duke University's Nicholas School of the Environment, pointed to Texas’ “connect and manage” model for connecting renewables to the grid, which allows projects to come online much more quickly than in the rest of the country. That’s because the state’s electricity market, ERCOT, does a much more limited study of what grid upgrades are needed to connect a project to the grid, and is generally more tolerant of curtailing generation (i.e. not letting power get to the grid at certain times) than other markets.
“As Texas continues to outpace other markets in generator and load interconnections, even in the absence of renewable tax credits, it seems increasingly plausible that developers and policymakers may conclude that deeper reform is needed to the non-ERCOT electricity markets,” Norris told Heatmap in an email.
At the federal level, there’s still a chance for, yes, bipartisan permitting reform, which could accelerate the buildout of all kinds of energy projects by shortening their development timelines and helping bring down costs, Xan Fishman, senior managing director of the energy program at the Bipartisan Policy Center, told Heatmap. “Whether you care about energy and costs and affordability and reliability or you care about emissions, the next priority should be permitting reform,” he said.
And Godfrey hasn’t given up on tax credits as a viable tool at the federal level, either. “If you told me in mid-November what this bill would look like today, while I’d still be like, Ugh, that hurts, and that hurts, and that hurts, I would say I would have expected more rollbacks. I would have expected deeper cuts,” he told Heatmap. Ultimately, many of the Inflation Reduction Act’s tax credits will stick around in some form, although we’ve yet to see how hard the new foreign sourcing requirements will hit prospective projects.
While many observers ruefully predicted that the letter-writing moderate Republicans in the House and Senate would fold and support whatever their respective majorities came up with — which they did, with the sole exception of Pennsylvania Republican Brian Fitzpatrick — the bill also evolved over time with input from those in the GOP who are not openly hostile to the clean energy industry.
“You are already seeing people take real risk on the Republican side pushing for clean energy,” Safford said, pointing to Alaska Republican Senator Lisa Murkowski, who opposed the new excise tax on wind and solar added to the Senate bill, which earned her vote after it was removed.
Some damage has already been done, however. Canceled clean energy investments adds up to $23 billion so far this year, compared to just $3 billion in all of 2024, according to the decarbonization think tank RMI. And that’s before OBBBA hits Trump’s desk.
The start-and-stop nature of the Inflation Reduction Act may lead some companies, states, local government and nonprofits to become leery of engaging with a big federal government climate policy again.
“People are going to be nervous about it for sure,” Safford said. “The climate policy of the future has to be polycentric. Even if you have the political opportunity to make a big swing again, people will be pretty gun shy. You will need to pursue a polycentric approach.”
But to Godfrey, all the back and forth over the tax credits, plus the fact that Republicans stood up to defend them in the 11th hour, indicates that there is a broader bipartisan consensus emerging around using them as a tool for certain energy and domestic manufacturing goals. A future administration should think about refinements that will create more enduring policy but not set out in a totally new direction, he said.
Albert Gore, the executive director of the Zero Emissions Transportation Association, was similarly optimistic that tax credits or similar incentives could work again in the future — especially as more people gain experience with electric vehicles, batteries, and other advanced clean energy technologies in their daily lives. “The question is, how do you generate sufficient political will to implement that and defend it?” he told Heatmap. “And that depends on how big of an economic impact does it have, and what does it mean to the American people?”
Ultimately, Fishman said, the subsidy on-off switch is the risk that comes with doing major policy on a strictly partisan basis.
“There was a lot of value in these 10-year timelines [for tax credits in the IRA] in terms of business certainty, instead of one- or two- year extensions,” Fishman told Heatmap. “The downside that came with that is that it became affiliated with one party. It was seen as a partisan effort, and it took something that was bipartisan and put a partisan sheen on it.”
The fight for tax credits may also not be over yet. Before passage of the IRA, tax credits for wind and solar were often extended in a herky-jerky bipartisan fashion, where Democrats who supported clean energy in general and Republicans who supported it in their districts could team up to extend them.
“You can see a world where we have more action on clean energy tax credits to enhance, extend and expand them in a future congress,” Fishman told Heatmap. “The starting point for Republican leadership, it seemed, was completely eliminating the tax credits in this bill. That’s not what they ended up doing.”