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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.
Read another helpful guide about heat:
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And more of the week’s most important conflicts around renewable energy.
1. Nantucket County, Massachusetts – The fight over Vineyard Wind is back with a vengeance. But can an aggrieved vacation town team up with conservative legal activists to take down an operating offshore wind project?
2. Henry County, Virginia – A fresh fiasco around a solar farm is renewing animus against solar projects in the Commonwealth of Virginia.
3. Calcasieu Parish, Louisiana – Solar developer Aypa is now suing this parish on the grounds it allegedly used zoning rules in an unfair and biased manner against one of its projects.
4. Outagamie County, Wisconsin – If at first you don’t kill the solar farm, try and go after the substation.
5. La Paz County, Arizona – Republicans in Congress are helping at least one area open up for more solar development.
6. Idaho – The federal government will officially re-do its review of the LS Energy Lava Ridge wind farm.
7. Monterey County, California – The EPA is finally getting more involved in the Moss Landing battery plant cleanup, after the agency declared this week it approved a new comprehensive remediation plan under CERCLA, a law that also governs the Superfund program.
More than $760 million from the Inflation Reduction Act’s Green and Resilient Retrofit Program is still caught in legal limbo — but no one seems to have noticed.
When a federal judge put an injunction on the Trump administration’s efforts to freeze Inflation Reduction Act funding back in April, many grantees were able to pick up their clean energy projects where they left off. But not everyone.
Some 100 low-income housing providers that won more than $760 million in grants and loans from the IRA’s Green and Resilient Retrofit Program to make critical safety and energy upgrades to their buildings are still in limbo. The U.S. Department of Housing and Urban Development will not respond to their questions about if or when projects can move forward, and also fired all of the third-party contractors that had been hired to implement the program.
While these developers are certainly not the only ones locked in a bureaucratic standstill — a lawsuit aiming to unlock money from the Greenhouse Gas Reduction Fund is still wending through the courts, and many states are waiting to hear whether they’ll ever get funding for their home energy retrofit rebate programs — their plight has so far been overlooked, raising the risk that the money could quietly disappear.
The Green and Resilient Retrofit Program addressed a known funding gap for affordable housing preservation. Low-income housing providers operate on tight margins and often struggle to pay for regular maintenance, let alone to make upgrades to their buildings. On top of that, many of the buildings that receive other subsidies from HUD are barred from taking on debt for improvements.
“So what do you do if your building is now 40 years old and it needs upgrades?” Juliana Bilowich, the senior director of housing operations and policy for Leading Age, a nonprofit focused on affordable senior housing, said to me. “There are some housing communities that haven’t had air conditioning for years because the HUD budget won’t support it, or it’s broken and it needs to be upgraded, but there’s no funding they can get to do that.”
That was the case for The Towers, a 20-story senior living center in New Haven, Connecticut, except the building was nearly 60 years old. While its individual apartments have air conditioning, there’s no HVAC system serving the hallways where residents have to wait for the elevator. “The summertime is horrible,” Gus Keach-Longo, the president and CEO of The Towers, told me.
While the building has made cosmetic improvements over the years, it hasn’t done major efficiency or structural work outside of installing LED lightbulbs, Keach-Longo told me. A recent assessment of the building scored it at a 7 out of 100 for energy efficiency. In addition to an HVAC solution, the building needed a new roof and windows.
The Green and Resilient Retrofit Program looked like it could be a lifeline for Towers residents. For one, it was uniquely flexible. The funds could be used for a wide range of projects, as long as they reduced the building’s emissions, improved its energy or water efficiency, or made it more resilient to flooding, extreme heat, or other weather-related hazards.
Billowich called the program a “linchpin” for buildings that didn’t have the ability to go to the bank and get a loan. “This was the way that housing communities were going to be able to continue operating.” Applicants planned to insulate their pipes so they didn’t burst during a cold front, or replace their windows to save money on energy and protect residents from wildfire smoke. The funds could also be leveraged to raise additional money for other kinds of repairs. The resulting energy savings could then be put toward expanding services for residents.
The $1 billion program was divided into three streams of funding. A building owner could get up to $750,000 per property under the “Elements” stream to supplement existing retrofit plans with green upgrades like solar panels. The “Leading Edge” stream supplied up to $10 million for more involved projects and required the building to ultimately meet a green certification, such as Passive House or LEED. The “Comprehensive” stream was designed to facilitate more complicated, full-building retrofits that required significant technical assistance to plan. Grantees could get up to $80,000 per unit, or $20 million total, but they would have to work with HUD-employed contractors that would scope out and oversee the project.
Department of Housing and Urban Development
The Towers applied for a Comprehensive grant and was one of just a few properties to win the full $20 million. But since signing a contract for the award last July, Keach-Longo said his team has “heard almost nothing.” They were supposed to be assigned a Multifamily Assessment Contractor, or MAC, the term for the HUD-employed contractor that would oversee the project, but the Biden administration never got to it. When the Trump administration came in, it halted the program as part of the larger IRA funding freeze. On February 12, HUD terminated its contracts with all five of the companies it had selected to serve as MACs, including big consulting firms like Deloitte and Ernst and Young. HUD did not respond to emailed questions for this story.
Margaret Salazar, the CEO of REACH Community Development in Oregon, has also been “stuck in a holding pattern” regarding her organization’s two Comprehensive awards. “We want to do right by what we’ve communicated with residents that we are making these repairs. We want to involve them in the process. And now we’re hanging out there without any path forward,” she told me.
When the funding freeze first went into effect in March, an affordable housing operator in the Boston area called the Codman Square Neighborhood Development Corporation, which had won an Elements grant, joined a lawsuit filed by five other nonprofits that challenged Trump’s pause. In April, the district court judge overseeing the case issued a preliminary injunction barring HUD and other agencies from maintaining any program-wide freezes.
The agency complied, in part. HUD sent a letter to awardees notifying them of the injunction and resumed processing reimbursements for Elements and Leading Edge grants. Ron Budynas, the chief operating officer for an affordable senior housing provider called Wesley Living, which won 10 separate awards from the program, told me he’s been able to proceed with his three Elements projects. He’s already completed one, upgrading an apartment complex in Lexington, Tennessee, with high efficiency heat pumps, and is now working on the others, installing solar and battery backup systems at two other properties in Tennessee.
His remaining seven are Comprehensive projects, however, and are “a whole different story,” he said. “Every time I’ve written to the [Green and Resilient Retrofit Program] staff, the only answer I get back from them on the Comprehensive grants is ’we’re still waiting for direction from headquarters.’”
Budynas was much further along than Keach-Longo at The Towers by the time Trump came into office. He said he was already working with a MAC and had completed a capital needs assessment on five of the properties; the next step was to scope out the work. He told me he contacted HUD after the court’s injunction and asked whether his team could put together the scope for one project to move it forward, but the agency told him no, since the program rules say that the MAC has to do it — even though it had fired all of the MACs.
Then the reconciliation bill that Congress passed earlier this month rescinded $138 million from the program — money set aside for administrative costs and technical assistance, i.e. to pay for the MACs. “How do we go forward if the MAC has to do the scope and they don’t have any money to pay the MAC?” Budynas said. Six of the seven Wesley Living properties that won Comprehensive awards receive HUD subsidies that preclude them from using other types of financing, “so there’s no way for us to update those properties if the Comprehensive doesn’t go forward,” he said.
It’s unclear whether any of this will be addressed in the lawsuit, since the only plaintiff in the case that challenged HUD — Codman Square — has been able to progress with its Elements award. I reached out to Democracy Forward, the nonprofit legal organization that is representing the plaintiffs, but it declined to comment.
Beth Neitzel, a partner at the law firm Foley Hoag, which is not involved in the case, told me this might be an unfortunate gray area for the Comprehensive award winners. She said the lawyers could argue that HUD is violating the terms of the injunction, but the government could respond that no one in the case is being injured by its actions.
“I don’t know if that will carry the day. It seems pretty clear they are violating the terms of the preliminary injunction by not unfreezing that fund,” Neitzel said. “But there is that potential wrinkle that they will argue that’s not an issue here because nobody here has standing to challenge that.” As a matter of law, she added, it’s irrelevant that HUD fired the contractors overseeing the program since the program itself was congressionally mandated.
Meanwhile the grantees wait, and the consequences of the delay stack up. Salazar, of REACH in Oregon, told me the organization missed out on an opportunity to get additional funding from the Portland Housing Bureau because it hadn’t been able to scope out the project with its MAC.
“This isn’t just money on the line. This is the future of these affordable housing communities,” Bilowich said. “That is a blue issue, that’s a red issue, that’s everybody’s issue. And so we need a solution, and this was the most efficient and cost-effective solution that everybody had come up with.”
On FERC’s ‘disastrous misstep,’ the World Court’s climate ruling, and 127 SMRs
Current conditions: The U.S. Northeast faces more flash flooding as cooling temperatures usher in rainfall • Scandinavia’s weeks-long heatwave continues, with temperatures reaching nearly 90 degrees Fahrenheit • The death toll from China’s heavy rains rose to 34, with as many as 80,000 people displaced.
The U.S. Federal Reserve board decided on Wednesday to hold interest rates steady at between 4.25% and 4.5%, in defiance of President Donald Trump’s call for looser policy. This also added to the headwinds facing renewables developers.
When borrowing costs are higher, it’s harder to lure investors to back projects. That dynamic is even more challenging for construction projects that take even longer and therefore accrue more interest, such as nuclear reactors or hydroelectric upgrades. “Developers rushing to build solar and wind energy between now and next summer to take advantage of tax credits will have to pay out these higher interest costs as they build,” Advait Arun, senior associate of energy finance at the Center for Public Enterprise and a Heatmap contributor, told my colleague Charu Sinha.
Interior Secretary Doug BurgumJohn McDonnell/Getty Images
In a secretarial order on Tuesday, Secretary of the Interior Doug Burgum directed his department to eliminate policies that give “preferential treatment” to wind and solar. The directive also orders the agency to consider withdrawing “areas onshore with high potential for wind energy development” from federal leasing and to ramp up studies on the effects of wind turbines on migratory birds.
“These policy changes represent a commonsense approach to energy that puts Americans’ interests first,” Burgum said in a statement. “Leveling the playing field in permitting supports energy development that’s reliable, affordable, and built to last.” The move “will result in higher energy costs, increased blackouts, job loss, and billions of dollars in stranded investments, further delaying shovel-ready projects supported by a domestic heavy manufacturing supply chain renaissance that spans 40 states,” said Stephanie Francoeur, a spokesperson for the green group Oceantic Network. “Crippling affordable and reliable wind energy makes no economic sense and undermines the administration’s ‘all-of-the-above’ energy strategy.”
Ford’s vehicle sales rose 14% to more than 612,000 in the last quarter, according to earnings that bested analysts’ expectations on Wednesday. But EV sales dropped 31% to just 16,438. The company told Electrek that demand for its F-150 Lightning had slumped and the Mustang Mach-E faced a recall, preventing the spike in Ford’s EV sales GM saw in the last quarter. But that isn’t stopping the Detroit giant from investing more in EVs.
Ford CEO Jim Farley teased an upcoming announcement about the company’s “plans to design and build breakthrough electric vehicles in America.” Farley said Ford wouldn’t compete with South Korean or Japanese brands in the mass-market EV space, but rather would invest in the truck and SUV market. More details are set to come at an event in Kentucky on August 11.
The White House nominated an executive from Southern Company to serve in the open seat on the Nuclear Regulatory Commission. Ho Nieh, who serves as the utility giant’s vice president of regulatory affairs, previously led the NRC’s Office of Nuclear Reactor Regulation before joining Southern right as the company completed work on the only two new reactors built from scratch in the U.S. in a generation, the pair of Westinghouse AP1000s at the Alvin W. Vogtle Generating Station in northern Georgia.
The nomination, now subject to Senate approval, came a month after Trump fired Democratic Commissioner Christopher Hanson in a move that critics said violated the NRC’s legal independence from the White House. Trump will now have another seat to fill. On Tuesday, Annie Caputo, a Republican commissioner who Trump initially appointed in 2017, abruptly resigned amid a series of dramatic overhauls at the agency that include demands from the Trump administration that the regulators “rubber stamp” new reactors. In her farewell email to NRC staff – a copy of which I obtained and published on my Substack newsletter, Field Notes – she said she planned to focus on her family.
Helion has started work on what could be the world’s first nuclear fusion power plant in Washington State. The Microsoft-backed startup broke ground on the facility, called the Orion plant, in Chelan County, east of Seattle, and set a goal to deliver power to the tech giant’s data centers in the state by 2028. Microsoft and Helion made history in May 2023 with the world’s first power purchase agreement for nuclear fusion, with Helion promising to deliver up to 50 megawatts of electricity following a ramp-up period of one year. The project is set to hook onto the Washington grid.
Helion isn’t the only fusion startup in the race to deliver power first. In December, Commonwealth Fusion Systems announced plans to build its debut power plant in Virginia. Those ambitious promises explain why investors have pumped $2.5 billion into fusion energy over the past two years, according to newly released industry data.