AC Is Now in 90% of U.S. Homes. The Bigger Fight Is Over Who Gets to Keep It On

AC Is Now in 90% of U.S. Homes. The Bigger Fight Is Over Who Gets to Keep It On

More than 90% of American households now have air conditioning, either central air or window units, according to a 2026 U.S. Census report cited by the Epoch Times. That number was under 2% in 1955. It's one of the fastest, most complete adoptions of a home technology in American history, and most people under 60 have never lived without it.

That wasn't always the plan. Before AC, Americans engineered their houses to survive summer. The Epoch Times detailed how double-hung windows, tall ceilings, wraparound porches, sleeping porches, and even detached summer kitchens were standard tools for beating the heat between 1880 and 1920. Architect John Cluver, quoted in the piece, said windows were once a serious engineering tool for pulling hot air out of a house, not just something to look through. President William Howard Taft reportedly had a screened sleeping porch built at the White House to deal with Washington summers.

That era is gone in the U.S., and few Americans want it back. But the rest of the world hasn't caught up, and the gap is now a matter of life and death.

The European Divide

According to Breitbart, only about 5 to 6% of Paris apartments have any form of air conditioning. During a recent European heat wave, France's national public health authority reported roughly 1,000 additional deaths in a single week compared to seasonal averages, and Europe overall saw about 16,000 heat-related deaths, with Belgium alone recording 1,747 excess deaths, per Breitbart's reporting.

Instead of expanding access to cooling, some European governments have moved the other direction. Breitbart reported that Italy's government under then-Prime Minister Mario Draghi rationed air conditioning and heating to cut dependence on Russian energy imports, and that police in the Italian resort town of Portofino cracked down on unauthorized AC units, prompting neighbors to report each other to authorities. Breitbart also noted a senior official in the Socialist-run Paris government publicly blamed the United States and its widespread AC use for contributing to the European heat wave, and reported that the EU's own Brussels headquarters kept air conditioning running only in certain sections during a record heat wave, drawing accusations of a two-tiered system for the politically connected.

Whether U.S. air conditioning use meaningfully drives European heat waves is a separate scientific question from Europe's own energy and housing choices. Global climate patterns are shaped by aggregate emissions from every major economy, not one country's home cooling habits. What the sourcing does show clearly is that European governments have made political choices around energy rationing, historic building stock, and low AC penetration that leave their populations more exposed to heat than Americans are.

There's a fair counterargument buried in this too. Northern and Western Europe historically didn't need AC the way the American South does, and retrofitting old stone and masonry apartment buildings for central air is expensive and sometimes structurally difficult. That's a real constraint, not just ideology. But a public health official blaming American consumers for a heat wave while EU headquarters staff sit in cooled offices is a defensible target for criticism regardless of that constraint.

The Bigger Problem: Cooling Is Eating the Grid

Air conditioning already accounts for roughly 10% of global electricity consumption, according to AVEVA's reporting on International Energy Agency data. The IEA's executive director, Fatih Birol, has called rising cooling demand "a blind spot for many decision-makers." The IEA has projected that energy use for cooling buildings could triple by mid-century even if governments hit their climate targets, largely because more households worldwide are installing air conditioners for the first time.

This is a global infrastructure problem, and it's already straining power grids during heat waves, according to AVEVA.

Engineers are working multiple angles at once. Researchers cited by AVEVA used machine-learning models and 3D-printed aluminum heat exchangers with wavy, bumped internal geometry to outperform standard brazed plate heat exchangers by up to 50%, though the laser-sintering process remains too expensive for anything beyond aerospace or specialty ships for now.

Separately, researchers at Spain's CSIC developed a nanomaterial coating, described in a study published in the journal Nanophotonics, that cools surfaces using passive daytime radiative cooling with no electricity required. In outdoor summer 2025 testing, the material cut surface temperatures by up to 12.9°C compared to an uncoated surface, according to refindustry.com. Project lead Cristina Vicente said the manufacturing method is inexpensive enough to scale industrially and could eventually coat roofs, building facades, vehicles, and electronics.

On the industrial side, Energy Live News reported the global data center liquid cooling market is projected to grow from about $4 billion in 2026 to $27 billion by 2033, driven by AI hardware that runs hotter and denser than anything before it. Irish data center operator Echelon Data Centres is already partnering with Trinovium, a subsidiary of Trinity Biotech, to build direct-to-chip liquid cooling systems.

None of these technologies are deployed at meaningful scale yet. The passive cooling nanomaterial is still lab-and-field-tested, not commercially available. The 3D-printed heat exchanger design can't yet be manufactured cheaply outside niche industries. The question is whether cooling technology improves fast enough to keep up with a world where AC adoption is rising simultaneously in Lagos, Mumbai, and Jakarta, none of which have America's grid capacity or Europe's population density advantages in insulation-heavy old buildings. The IEA's tripling projection assumes current trends hold. Nobody in these sources says what happens if they don't.