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As heat waves get worse, these fixes will help keep your home cool and energy efficient.
July 2023 will almost certainly be declared the hottest month ever recorded, but it is unlikely to hold that record for long. Climate change is making heat waves more frequent, intense, and longer-lasting across the U.S.
Adapting to this hotter future is often discussed at the scale of a city; measured in early warning systems, green spaces, and cooling centers. But there’s also a lot that individual homeowners can do to help their communities and protect themselves.
While the vast majority of American households — some 88% — use air conditioning for relief, homeowners would be wise to consider a variety of additional, “passive” cooling techniques. These are strategies that can keep your home at a safe temperature during a heat wave if the power goes out, an increasingly likely scenario. They will also save you a bit of money on energy bills. In a sense, adapting your home to extreme heat is just another way of thinking about how to make it more energy efficient.
These retrofits also have wider benefits. Since air conditioners work by transferring heat from inside your house outdoors, these fixes can cool down your neighborhood. They’ll cut carbon emissions and air pollution by lowering demand for electricity. If widely adopted, they’ll also help prevent blackouts and could shrink the amount of renewable energy projects that need to be built to replace fossil fuels, alleviating pressure on conservation.
I spoke with Steve Easley, a building science consultant who specializes in energy efficiency, and Shawn Maurer, technical director of the Smart Energy Design Assistance Center at the University of Illinois, about how homeowners should prioritize their options when it comes to passive cooling.
“I always recommend that people do a home energy audit from a certified HERS rater,” Easley told me, referring to the Home Energy Rating System, a nationally recognized system for inspecting and calculating a home’s energy performance. The auditor will tell you how leaky your house is, and how well your roof insulation, windows, and other parts of your house are working to keep out heat, and help you figure out what to attack first. (Easley also recommends getting at least three quotes for any of these solutions, because different contractors bid this work out very differently.)
Below are five things you can do to improve your home’s resilience to heat. Depending on a number of factors — such as where you live, how your house is constructed, and the condition it's in — the mileage you can get out of each of these measures will vary. The good news is that the federal government and many state governments offer tax credits and rebates for most of these solutions. The Inflation Reduction Act created the Energy Efficient Home Improvement tax credit, which offers homeowners up to $1,200 per year to spend on energy efficiency improvements. As part of that, you can claim $150 simply for getting an energy audit.
Maurer said the very first thing he would do to improve the efficiency of a home is to seal up any cracks where air can get in — for example, along the edges of the floors, around the windows, and in the ceiling around light fixtures. “That carries in moisture, heat, and everything from outdoors into the house. It's going to offset any air conditioned air you got inside the house. So air leakage is usually the place we recommend to start,” he said. “And then from there, it's what your budget can handle as far as adding more insulation to your house.”
Insulation comes in a wide range of materials, such as fiberglass and rock wool, blown cellulose, and rigid foam boards. It can be blown into your walls, installed on the floor of the attic, or underneath your roof deck. It’s a jack-of-all-trades when it comes to energy efficiency, since it keeps heat inside in the winter and blocks it from entering in the summer. That means it’s a great option for those in colder climates that also want to prepare their homes for hotter summers.
A 2021 study by a group of researchers at Lawrence Berkeley National Lab modeled the efficacy of a wide array of passive cooling measures in low-income homes in Fresno, California. It found that roof insulation, along with solar-control window films, which we’ll get to in a moment, were the two most effective ways to keep heat from entering the buildings. However, the authors note that roof insulation is an expensive major retrofit, and recommend that it only be done when the roof needs replacement.
A good first step might be finding out what kind of insulation you already have. The most important metric when it comes to insulation is called “R-value,” and the higher the number, the more effective it is. Older homes may have attic insulation as low as R-13, whereas modern building codes typically require insulation between R-38 and R-60.
The new federal tax credit offers up to 30% of the total cost of a project for air sealing and insulation, maxing out at $1,200 total. (Labor costs are not covered by the credit.)
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Having a light-colored roof and exterior will most certainly keep your home cooler than darker options, but not all light colors are created equal. “Cool” roofs and walls are made with special materials that reflect solar energy back into space, preventing it from being absorbed by the building. They also have high “thermal emittance,” meaning they release a lot of the heat that they do absorb, rather than sending it indoors.
All kinds of materials have been developed with these properties. For roofs, there are tiles, shingles, membranes, liquid coatings, and products made of slate, wood, and metal.
Cool roofs don’t necessarily have to be white, although the color does work very well. According to a database maintained by the Cool Roof Ratings Council, the most effective products tend to be bright white coatings, but there are also gray, green, blue, brown, and tan products that are rated highly.
For reflective walls, the most effective products similarly come in white and other light-colored paints, which can reflect 60 to 90 percent of sunlight when new. An extensive 2019 study of reflective wall paints by the same group at Lawrence Berkeley National Lab found that cool walls can reduce annual energy use in single-family homes in warmer U.S. climates by 2% to 8.5%.
Easley said it’s worth considering a cool roof if you have a central air conditioning system in your attic. Otherwise, attics in places like Arizona can get upwards of 130 degrees, taxing the equipment and forcing it to work harder. If your attic isn’t home to your AC, it may only make financial sense to do this kind of retrofit if your house is already in need of a new paint job or your roof needs work.
But it’s probably not worth considering a cool roof if you live in a colder climate, like the Northeast and upper Midwest, since cool roofs can actually make it colder inside in the winter.
There’s no federal incentives for cool roofs, but several states and utilities offer rebates.
This is a big category, and it’s easy to get overwhelmed by the options. Starting with those that will likely cost the most to the least, you can:
•Replace your windows altogether.
• Add storm windows to the interior or exterior of your existing glass.
• Purchase films that can be applied to the existing glass to increase its reflectivity.
•Install external shutters or awnings that block the sun.
• Install interior blinds and curtains that block the sun.
Here’s a rundown of each option.
New windows: Replacing your windows can cost tens of thousands of dollars, so unless they are already in need of repair, you may want to hold off on that option. But when the day does come around, you’ll want to look for “Low-E” windows, which stands for low emissivity. The inside of the glass is coated with microscopic layers of silver that reflect heat while still allowing light to pass through.
Within that category, you’ll also want to look for windows that have what’s called a low “solar heat gain coefficient.” This measures how much heat is absorbed by the glass and transferred inside. It’s rated on a scale of 0 to 1. If you live somewhere that’s sunny year round like Arizona, you ideally want one rated 0.25 or lower.
Through 2032, homeowners can claim up to $600 in federal tax credits for purchasing Energy Star rated windows.
Storm windows: Rather than replacing your windows entirely, it’s far cheaper to install storm windows with Low-E glass, which basically involves bolting another window to the outside of your house. Storm windows have an added benefit of improving air sealing, eliminating drafts.
Film: An even lower-cost option is to look into films with low solar heat gain coefficients that can be applied to existing windows. However, Easeley warned that many manufacturers will void your warranty if you add films to your windows.
Shutters, awnings, blinds, and curtains: Exterior shutters and overhangs that block the sun from ever reaching your windows will generally be more effective than interior shades or blinds, but all of these measures can help. “Window blinds and curtains are really dirt cheap ways to control energy,” said Maurer. “It’s not a very good buffer, but it’s something.”
The Berkeley study on passive cooling measures notes that blinds moderately improve how much heat from the sun enters your home, but they can feel more effective by reducing the sensation of sunlight streaming into your house.
If you still have any incandescent lights, they can also be a significant source of heat. They should be replaced with LED lights.
Planting trees, climbing ivy, and other vegetation can also passively cool your house by shading both your house and any surrounding pavement. However, if you have solar panels, or plan to get them in the future, do not plant trees on the south side of your home as it may reduce the solar system’s effectiveness.
Maurer cautioned that if you do a bunch of work in your home to reduce your cooling needs, you’ll want to keep that in mind if you ever have to replace your air conditioner. He advised having a contractor come in to re-measure what size system you need, since doing a like-for-like replacement will probably be overkill and could result in it malfunctioning.
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A little-noticed provision would make the payment option used by tax-exempt groups all but impossible to claim.
A little-noticed provision in the Senate tax bill will sabotage the efforts of tribes, rural electric cooperatives, and public power authorities to develop local affordable energy projects by striking a section of the Inflation Reduction Act that enabled tax-exempt groups to claim the clean energy tax credits as direct cash payments from the Treasury.
The IRA included strict domestic sourcing requirements beginning in 2026 for groups utilizing this “direct pay” option. But the law also created exceptions for cases where domestic components were not available in sufficient quantity or quality, or would increase costs by more than 25%. The Senate bill would get rid of these exceptions.
“It just makes it unlikely for those projects to go forward — or more likely for those projects to go forward with a private developer, instead of with a public utility or a tribe or a rural co-op,” Grace Henley, a tax attorney with the Natural Resources Defense Council, told me. “And so they don’t really do anything to increase the amount of domestic material that would be used, they just hurt the projects that are seeking to invest in clean energy infrastructure for these communities to lower costs.”
Public power and tribal energy advocates warn that without the exceptions, energy development will become impossible for their constituents.
Wind and solar projects being developed by these groups are already threatened by the bill’s rapid phase-out of wind and solar tax credits and its complex rules related to using materials from China. Chèri Smith, the executive director of the Alliance for Tribal Energy, told me that Tribes face longer development timelines than the average private developer. “We have multiple stages of approval that are unique to tribal energy development,” she told me, including lengthy internal consultation processes. The changes to direct pay will put these projects further out of reach, she said.
The Alliance provides free energy development consulting services to more than 100 Tribes. Smith sent me a list of projects in Alaska Native villages, Arizona, California, and Oregon that could be killed by the tax credit changes. “Alaska Native villages face some of the highest energy costs in the country,” she said, largely due to their reliance on diesel generators. Just over a third of the Hopi Tribe in Arizona lacks access to electricity, but now multiple microgrid projects meant to close the gap are at risk. Many of the projects on the list are also doubly threatened by grant cancellations and the repeal of the Tribal Energy Loan Guarantee Program.
“The bill is particularly harmful to Tribal Nations, pulling the rug out from under projects that would strengthen their energy sovereignty and power local communities,” Democratic Senators Martin Heinrich, Ron Wyden, and Brian Schatz wrote in a joint statement on Thursday. “Together, the Tribal Energy Loan Guarantee Program and our Inflation Reduction Act’s clean energy tax credits have cleared pathways and removed significant barriers for Tribes to finance and build their own resilient energy infrastructure.”
The American Public Power Association is also sounding the alarm. John Godfrey, the group’s senior government relations director, told me that in addition to wind and solar, municipal utilities and rural electric co-ops are also considering nuclear and hydropower projects. For example, Energy Northwest, a consortium of 29 public utilities in Washington State, has plans to retrofit the Columbia Generating Station nuclear plant to increase its power output. It’s also in early stages to deploy four small, modular nuclear reactors. As my colleague Matthew Zeitlin wrote a few days ago, the governor of New York has also tasked the New York Power Authority with developing a new nuclear plant in the state.
Nuclear and hydropower “are technologies where often there is not a U.S. source, but there is a good trading partner source — Canada, Germany, Japan,” Godfrey said. By tightening the domestic sourcing requirements for direct pay, the bill would “hinder the very technologies that there’s generally a bipartisan consensus we need to be developing.”
Public utilities and electric co-ops, which serve close to 30% of electric customers in the U.S., are also unfairly singled out by the provision, he said. “If my public power utility wants to develop a project and they need a Canadian turbine, they can’t get any credit. But if a taxable corporation down the street develops exactly the same project, they can.”
“If the purpose is to encourage hydropower, that’s not a good use of resources,” he said.
Senate Republicans tucked a carveout into their reconciliation bill that would allow at least one lucky renewable energy project to qualify for a major Inflation Reduction Act tax credit even after the law is all but repealed.
The only problem is, it’s near impossible to be sure right now who may actually benefit from this giveaway — and the mystery is driving me up the wall. I feel like Charlie Day in that episode of It’s Always Sunny in Philadelphia, stringing documents together and ranting like a lunatic.
The Senate bill would phase out the tech-neutral production tax credit starting next year and completely eliminate it by the start of 2028. For the past week and a half, I have been trying to solve the riddle of an exemption tucked into the language that would allow a wind or solar facility that is “part of a single project” to continue to take advantage of the tech-neutral production tax credit as it exists today, which means it would not begin to phase out until 2034.
To qualify for the exemption a project must, according to the Senate text, meet two conditions: It must produce more than 1 gigawatt of electricity, and be sited on federal lands where a “right-of-way grant or lease” had been given by the Bureau of Land Managementbefore June 16, which is the date the text was released.
Only a handful of projects in the U.S. could possibly fit that criteria. But every time I think I’ve identified one that will actually qualify, I learn a new fact that, to me, takes it out of the running.
Here’s why my head hurts so much: A renewables facility that would benefit from this language needs to be sited at least partially on federal lands. But because Trump isn’t issuing new right-of-way approvals or leases to most renewables projects right now, it likely had to get its right-of-way or its lease before he entered office. (The June 16 language feels like a bit of a red herring. Nothing that fits the other definitions has received these documents since the start of Trump 2.0.)
Then there’s another factor: The only projects that would benefit from this language are ones that haven't started construction yet. Even if a project doesn’t have all of its permits for federal land use, its developer can build stuff like roads on any connected private lands and technically meet the deadline to start construction laid out in the new legislation. The construction start date is what counts — it doesn’t matter whether a project is placed in service and provides power to the grid years later, as long as it began construction before that deadline.
Taken together, all this means that a project that would benefit from this language probably has to be sited on federal lands and hold permits already … but for some reason can’t start construction to qualify for the program.
When I first started hunting for an answer, many people — including renewables advocates, anti-wind activists, and even some Senate staff in conversations with me — speculated that the language was a giveaway to two wind projects under construction in Wyoming, Chokecherry and Sierra Madre, which together make up what would likely be the largest wind farm in the U.S. if completed. These two projects are largely sited on federal lands and received all their approvals before Trump entered office.
I understand why people are pointing at Chokecherry and Sierra Madre. They are not expected to be online before 2029, and the House version of the bill would have locked them out of the production tax credit because it added a requirement that projects be “placed in service” — i.e. actively providing power to the grid — by around that same period. Any slippage in construction might have really hurt their finances. They’re also backed by a powerful billionaire, GOP donor and live entertainment power-broker Phil Anschutz, a man who made his initial fortune partially from fossil fuels.
Except … my colleagues and I are still not convinced. That’s because it is not clear that these two projects are at any actual risk of losing the production tax credit. They have been actively under construction for a long time, and the Senate bill killed the House’s “placed in service” requirement.
Another project floated is the Lava Ridge wind farm in Idaho, which was fully permitted under Biden, is largely sited on federal lands, and would produce more power than necessary to qualify for the exception. Hypothetically, this project would be a great candidate for being a beneficiary of the bill because Trump banned work on the project via executive order amid opposition from Idaho politicians, making a carveout to get more time a worthwhile endeavor.
Except … Senate Finance Chair Mike Crapo, the lead author of the pertinent section of the Senate reconciliation bill, was one of those Idaho politicians who pushed Trump to kill Lava Ridge. Why would he give a tax break to a project he wanted dead?
Then there was my personal best guess for the beneficiary: Esmeralda 7, an expansive set of proposed solar farms in the Nevada desert that, as proposed, would produce more than 5 gigawatts of power and is largely sited on federal land. Construction can’t begin until Esmeralda 7 gets its federal approvals, and the Trump administration was expected to complete that work by mid-summer.
Except … I reported last week that the permitting process for Esmeralda 7 is now indefinitely stalled. The project is at best still months away from getting its right-of-way approvals from the Trump administration, which recently pushed back timelines for finishing reviews of other large Nevada solar projects, too.
Ultimately, it will be difficult to glean who the lobbyist giveaway here is for unless the legislators who wrote it disclose their intentions. I reached out to the communications director for Republicans on the Senate Finance Committee to try and find out, but so far I’ve gotten crickets.
It may be that this language is revised and that future changes lay out the true beneficiary. Sometimes lawmakers will put the wrong date or word into a bill and they’ll edit it on the floor before a vote, chalking it up to a drafting error.
If senators decide to add back the “placed in service” requirement to capitulate to the House, this would easily be the Chokecherry-Sierra Madre giveaway. If Republicans were to shift forward the deadline for getting a right-of-way, Esmeralda 7 would qualify. Or maybe they could change some secret third thing and a different project I hadn’t considered will be revealed as the mastermind in the shadows.
Until then, I’ll be in my basement poring over more maps and going slowly insane.
Additional reporting was provided by Emily Pontecorvo.
On resuming rare earth shipments, hurricane tracking, and EV tax credits
Current conditions: The Ohio Valley is still sweltering through the last remnants of this week’s brutal heat wave • The death toll from recent floods in South Africa has risen to 101 • It’s 90 degrees in Venice, Italy, where the world’s rich and famous are gathering for the wedding of Jeff Bezos and Lauren Sanchez.
The U.S. and China have hammered out the details of a trade deal, including an agreement that China will resume rare earth shipments to the U.S. Rare earth materials are essential for everything from planes to EVs to wind turbines. China controls most of the world’s rare earth production and halted exports in April in response to President Trump’s tariff hike, and China’s chokehold on rare earths threatened to derail trade talks between the two countries altogether. Commerce Secretary Howard Lutnick said a deal has now been “signed and sealed.” “They’re going to deliver rare earths to us,” Lutnick said, adding that the U.S. will then “take down our countermeasures.” Lutnick also indicated that Trump plans to announce further trade deals with other nations in the coming two weeks.
As climate talks in Bonn, Germany, wind down, negotiators there have agreed to increase the budget for the United Nations Framework Convention on Climate Change by 10% over the next two years to 81.5 million euros ($95.4 million). The UNFCCC runs some of the world’s largest climate negotiations and tries to ensure countries follow through on their climate commitments. Its budget is funded by government contributions. China will account for 20% of the new budget, Reuters reported. The U.S. is supposed to cover 22%, but President Trump has pulled international climate funding. Former New York Mayor Michael Bloomberg’s philanthropic arm has stepped in to cover the missing U.S. contributions. UN climate chief Simon Stiell said the budget increase was “a clear signal that governments continue to see UN-convened climate cooperation as essential, even in difficult times.”
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Hurricane forecasting is about to get a little bit more difficult. At the end of June, the federal government is going to stop distributing readings from the Defense Meteorological Satellite Program, a tool forecasters all over the world have been using to track and predict hurricane development. As retired federal meteorologist Alan Gerard told Bloomberg, this particular satellite program is unique because it lets forecasters peer inside storms and monitor for rapid intensification. As the planet warms, hurricanes are strengthening much faster than they did in recent decades. Hurricane expert Michael Lowry says the Department of Defense seems to be concerned that the satellite data poses a security concern. Its termination “will severely impede and degrade hurricane forecasts for this season and beyond, affecting tens of millions of Americans who live along its hurricane-prone shorelines,” Lowry wrote.
A group of U.S. car dealers penned a letter urging senators to “reject provisions in the budget reconciliation process that would abruptly eliminate EV-related tax credits from the Inflation Reduction Act,” warning that sudden changes would bring about market uncertainty, damage businesses, and hurt Americans. The signatories – including EV Auto, Carmax, and Caravan – instead call for a “gradual sunset” of the EV tax credits to avoid disruption to the used car market. “A multi-year transitional period would also provide the opportunity for Americans to continue adopting cleaner vehicles more affordably,” they add. The tax and budget bill put forward by Senate Republicans would end the $7,500 EV tax credit within 180 days after the law’s passage.
A report out today from the International Council on Clean Transportation estimates that the world’s private jets produced more greenhouse gas emissions in 2023 than all the flights that took off from Heathrow Airport — the world’s fourth busiest airport — that same year. Emissions from private jets increased 25% over the past decade. A few more interesting (though perhaps not surprising) tidbits from the report:
International Council on Clean Transportation
Solar power accounted for more than 10% of U.S. electrical output in April, while wind provided about 14%. As Michelle Lewis at Electreknotes, “solar is now producing more electricity than hydropower, biomass, and geothermal combined.”