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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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The administration seems to be pursuing a “some of the above” strategy with little to no internal logic.
The Department of Energy justified terminating hundreds of congressionally-mandated grants issued by the Biden administration for clean energy projects last week (including for a backup battery at a children’s hospital) by arguing that they were bad investments for the American people.
“Following a thorough, individualized financial review, DOE determined that these projects did not adequately advance the nation’s energy needs, were not economically viable, and would not provide a positive return on investment of taxpayer dollars,” the agency’s press release said.
It’s puzzling, then, that the Trump administration is pouring vast government resources into saving aging coal plants and expediting advanced nuclear projects — two sources of energy that are famously financial black holes.
The Energy Department announced it would invest $625 million to “reinvigorate and expand America’s coal industry” in late September. Earlier this year, the agency also made $900 million available to “unlock commercial deployment of American-made small modular reactors.”
It’s hard to imagine what economic yardsticks would warrant funding to keep coal plants open. The cost of operating a coal plant in the U.S. has increased by nearly 30% since 2021 — faster than inflation — according to research by Energy Innovation. Driving that increase is the cost of coal itself, as well as the fact that the nation’s coal plants are simply getting very old and more expensive to maintain. “You can put all the money you want into a clunker, but at the end of the day, it’s really old, and it’s just going to keep getting more expensive over time, even if you have a short term fix,” Michelle Solomon, a program manager at Energy Innovation who authored the research, told me.
Keeping these plants online — even if they only operate some of the time— inevitably raises electricity bills. That’s because in many of the country’s electricity markets, the cost of power on any given day is determined by the most expensive plant running. On a hot summer day when everyone’s air conditioners are working hard and the grid operator has to tell a coal plant to switch on to meet demand, every electron delivered in the region will suddenly cost the same as coal, even if it was generated essentially for free by the sun or wind.
The Trump administration has also based its support for coal plants on the idea that they are needed for reliability. In theory, coal generation should be available around the clock. But in reality, the plants aren’t necessarily up to the task — and not just because they’re old. Sandy Creek in Texas, which began operating in 2013 and is the newest coal plant in the country, experienced a major failure this past April and is now expected to stay offline until 2027, according to the region’s grid operator. In a report last year, the North American Electric Reliability Corporation warned that outage rates for coal plants are increasing. This is in part due to wear and tear from the way these plants cycle on and off to accommodate renewable energy sources, the report said, but it’s also due to reduced maintenance as plant operators plan to retire the facilities.
“You can do the deferred maintenance. It might keep the plant operating for a bit longer, but at the end of the day, it’s still not going to be the most efficient source of energy, or the cheapest source of energy,” Solomon said.
The contradictions snowball from there. On September 30, the DOE opened a $525 million funding opportunity for coal plants titled “Restoring Reliability: Coal Recommissioning and Modernization,” inviting coal-fired power plants that are scheduled for retirement before 2032 or in rural areas to apply for grants that will help keep them open. The grant paperwork states that grid capacity challenges “are especially acute in regions with constrained transmission and sustained load growth.” Two days later, however, as part of the agency’s mass termination of grants, it canceled more than $1.3 billion in awards from the Grid Deployment Office to upgrade and install new transmission lines to ease those constraints.
The new funding opportunity may ultimately just shuffle awards around from one coal plant to another, or put previously-awarded projects through the time-and-money-intensive process of reapplying for the same funding under a new name. Up to $350 million of the total will go to as many as five coal plants, with initial funding to restart closed plants or to modernize old ones, and later phases designated for carbon capture, utilization, and storage retrofits. The agency said it will use “unobligated” money from three programs that were part of the 2021 Infrastructure Investment and Jobs Act: the Carbon Capture Demonstration Projects Program, the Carbon Capture Large-Scale Pilot Projects, and the Energy Improvements in Rural or Remote Areas Program.
In a seeming act of cognitive dissonance, however, the agency has canceled awards for two coal-fired power plants that the Biden administration made under those same programs. One, a $6.5 million grant to Navajo Transitional Energy Company, a tribal-owned entity that owns a stake in New Mexico’s Four Corners Generating Station, would have funded a study to determine whether adding carbon capture and storage to the plant was economically viable. The other, a $50 million grant to TDA Research that would have helped the company validate its CCS technology at Dry Fork Station, a coal plant in Wyoming, was terminated in May.
Two more may be out the window. A new internal agency list of grants labeled “terminate” that circulated this week included an $8 million grant for the utility Duke Energy to evaluate the feasibility of capturing carbon from its Edwardsport plant in Indiana, and $350 million for Project Tundra, a carbon capture demonstration project at the Milton R. Young Station in North Dakota.
“It’s not internally consistent,” Jack Andreason Cavanaugh, a global fellow at the Columbia University’s Carbon Management Research Initiative, told me. “You’re canceling coal grants, but then you’re giving $630 million to keep them open. You’re also investing a ton of time and money into nuclear — which is great, to be clear — but these small modular reactors haven’t been deployed in the United States, and part of the reason is that they’re currently not economically viable.”
The closest any company has come thus far to deploying a small modular reactor in the U.S. is NuScale, a company that planned to build its first-of-a-kind reactors in Idaho and had secured agreements to sell the power to a group of public utilities in Utah. But between 2015, when it was first proposed, and late 2023, when it died, the project’s budget tripled from $3 billion to more than $9 billion, while its scale was reduced from 600 megawatts to 462 megawatts. Not all of that was inevitable — costs rose dramatically in the final few years due to inflation. The reason NuScale ultimately pulled out of the project is that the cost of electricity it generated was going to be too high for the market to bear.
It’s unclear how heavily the DOE will weigh project financials in the application process for the $900 million for nuclear reactors. In its funding announcement, it specified that the awards would be made “solely based on technical merit.” The agency’s official solicitation paperwork, however, names “financial viability” as one of the key review criteria. Regardless, the Trump administration appears to recognize the value in funding first-of-a-kind, risky technologies when it comes to nuclear, but is not applying the same standards to direct air capture or hydrogen plants.
I asked the Department of Energy to share the criteria it used in the project review process to determine economic viability. In response, spokesperson Ben Dietderich encouraged me to read Wright’s memorandum describing the review process from May. The memo outlines what types of documentation the agency will evaluate to reach a decision, but not the criteria for making that decision.
Solomon agreed that advanced nuclear might one day meet the grid’s growing power needs, but not anytime soon. “Hopefully in the long term, this technology does become a part of our electricity system. But certainly relying on it in the short term has real risks to electricity costs,” she said. “And also reliability, in the sense that the projects might not materialize.”
The collateral damage from the Lava Ridge wind project might now include a proposed 285-mile transmission line initially approved by federal regulators in the 1990s.
The same movement that got Trump to kill the Lava Ridge wind farm Trump killed has appeared to derail a longstanding transmission project that’s supposed to connect sought-after areas for wind energy in Idaho to power-hungry places out West.
The Southwest Intertie Project-North, also known as SWIP-N, is a proposed 285-mile transmission line initially approved by federal regulators in the 1990s. If built, SWIP-N is supposed to feed power from the wind-swept plains of southern Idaho to the Southwest, while shooting electrons – at least some generated from solar power – back up north into Idaho from Nevada, Utah, and Arizona. In California, regulators have identified the line as crucial for getting cleaner wind energy into the state’s grid to meet climate goals.
But on Tuesday, SWIP-N suddenly faced a major setback: The three-person commission representing Jerome County, Idaho – directly in the path of the project – voted to revoke its special use permit, stating the company still lacked proper documentation to meet the terms and conditions of the approval. SWIP-N had the wind at its back as recently as last year, when LS Power expected it to connect to Lava Ridge and other wind farms that have been delayed by Trump’s federal permitting freeze on renewable energy. But now, the transmission line has stuttered along with this potential generation.
At a hearing Tuesday evening, county commissioners said Great Basin Transmission, a subsidiary of LS Power developing the line, would now suddenly need new input, including the blessing of the local highway district and potential feedback from the Federal Aviation Administration. Jerome County Commissioner Charles Howell explained to me Wednesday afternoon that there will still need to be formal steps remanding the permit, and the process will go back to local zoning officials. Great Basin Transmission will then at minimum need to get the sign-offs from local highway officials to satisfy his concerns, as well as those of the other commissioner who voted to rescind the permit, Ben Crouch.
The permit was many years old, and there are outstanding questions about what will happen next procedurally, including what Great Basin Transmission is actually able to do to fight this choice by the commissioners. At minimum, staff for the commission will write a formal decision explaining the reasoning and remand the permit. After that, it’ll be up to Great Basin Transmission to produce the documents that commissioners want. “Even our attorney and staff didn’t have those answers when we asked that after the vote,” Howell said, adding that he hopes the issues can be resolved. “I was on the county commission about when they decided where to site the towers, where to site the right-of-ways. That’s all been there a long time.”
This is the part where I bring up how Jerome County’s decision followed a months-long fight by aggrieved residents who opposed the SWIP-N line, including homeowners who say they didn’t know their properties were in the path of the project. There’s also a significant anti-wind undercurrent, as many who are fighting this transmission line previously fought LS Power’s Lava Ridge wind project, which was blocked by and executive order from President Donald Trump on his first day in office. Jerome County itself passed an ordinance in May requiring any renewable energy facility to get all federal, state, and local approvals before it would sign off on new projects.
Opposition to SWIP-N comes from a similar place as the “Stop Lava Ridge” campaign. Along with viewshed anxieties and property value impacts, SWIP-N, like Lava Ridge, would be within single-digit miles of the Minidoka National Historic Site, a former prison camp that held Japanese-Americans during World War II. In the eyes of its staunchest critics, constructing the wind farm would’ve completely damaged any impact of visiting the site by filling the surroundings of what is otherwise a serene, somber scene. Descendants of Minidoka detainees lobbied politicians at all levels to oppose Lava Ridge, a cause that was ultimately championed by Republican politicians in their fight against the project.
These same descendants of Japanese-American detainees have fought the transmission line, arguing that its construction would inevitably lead to new wind projects. “If approved, the SWIP-N line would enable LS Power and other renewable energy companies to build massive wind projects on federal land in and around Jerome County in future years,” wrote Dan Sakura, the son of a Minidoka prisoner, in a September 15 letter to the commission.
Sakura had been a leading voice in the fight against Lava Ridge. When I asked why he was weighing in on SWIP-N, he told me over text message, “The Lava Ridge wind project poisoned the well for renewable energy projects on federal land in Southern Idaho.”
LS Power did not respond to a request for comment.
It’s worth noting that efforts have already been made to avoid SWIP-N’s impacts to the Minidoka National Historic Site. In 2010, Congress required the Interior Secretary to re-do the review process for the transmission line, which at the time was proposed to go through the historic site. The route rejected by Jerome County would go around.
There is also no guarantee that wind energy will flock to southern Idaho any time soon. Yes, there’s a Trump permitting freeze, and federal wind energy tax credits are winding down. That’s almost certainly why the developers of small nuclear reactors have reportedly coveted the Lava Ridge site for future projects. But there’s also incredible hostility pent up against wind partially driven by the now-defunct LS Power project, for instance in Lincoln County, where officials now have an emergency moratorium banning wind energy while they develop a more permanent restrictive ordinance.
Howell made no bones about his own views on wind farms, telling me he prefers battery storage and nuclear power. “As I stand here in my backyard, if they put up windmills, that’s all I’m going to see for 40 miles,” he said
But Howell did confess to me that he thinks SWIP-N will ultimately be built – if the company is able to get these new sign-offs. What kind of energy flows through a transmission line cannot ultimately affect the decision on the special use permit because, he said, “there are rules.” On top of that, Idaho is going to ultimately need more power no matter what, and at the very least, the state will have to get electrons from elsewhere.
Howell’s “non-political” answer to the fate of SWIP-N, as he put it to me, is that “We live on power, so we gotta have more power.”
The week’s most important news around renewable project fights.
1. Western Nevada — The Esmeralda 7 solar mega-project may be no more.
2. Washoe County, Nevada – Elsewhere in Nevada, the Greenlink North transmission line has been delayed by at least another month.
3. Oconto County, Wisconsin – Solar farm town halls are now sometimes getting too scary for developers to show up at.
4. Apache County, Arizona – In brighter news, this county looks like it will give its first-ever conditional use permit for a large solar farm, EDF Renewables’ Juniper Spring project.
5. Putnam County, Indiana – After hearing about what happened here this week, I’m fearful for any solar developer trying to work in Indiana.
6. Tippecanoe County, Indiana – Two counties to the north of Putnam is a test case for the impacts a backlash on solar energy can have on data centers.