Most European homes were built long before air conditioning existed, and for most of the continent’s history, they didn’t need it. A combination of milder summers, thick-walled construction, high electricity costs, and strict environmental regulations kept AC out of European homes for decades. That’s now changing as heatwaves intensify, but the installed base remains far behind the United States, where central air is standard in roughly 90% of homes.
European Summers Were Historically Mild Enough
The simplest reason is climate. Cities like London, Amsterdam, and Berlin have average summer highs in the low-to-mid 20s Celsius (roughly the low-to-mid 70s Fahrenheit). Compare that to Atlanta, Houston, or Phoenix, where summer highs routinely exceed 35°C (95°F) with punishing humidity. For most of the 20th century, Europeans could get through summer with open windows and a fan. The United States, by contrast, developed much of its suburban housing stock in hot Southern and Southwestern states during the postwar boom, when AC was already becoming affordable. Air conditioning wasn’t a luxury there; it was a prerequisite for livability.
That gap is narrowing. Heat waves across Europe have increased sharply since the early 1990s, and the decade from 2011 to 2021 recorded more heat waves than any previous period. Southern and eastern regions, including Spain, France, and Italy, have seen the most dramatic rise. During summer 2025, most of central and southern Europe experienced “very strong” heat stress, with parts of the Iberian Peninsula and Greece hitting “extreme” levels. The old assumption that Europeans simply don’t need cooling is becoming outdated.
Stone and Brick Buildings Stay Cooler on Their Own
Traditional European construction relies heavily on stone, brick, and concrete, materials with high thermal mass. These dense walls absorb heat slowly during the day and release it slowly at night, acting like a natural buffer against temperature swings. A wood-frame house, the standard in American residential construction, heats up fast and holds onto that heat.
The difference is substantial. In one controlled experiment comparing a masonry building to an otherwise identical lightweight-frame building during a 14-day heat wave, the masonry structure stayed an average of 2.8°C cooler indoors. At the hottest part of the day, the gap widened to 3.4°C. Perhaps most striking: the lightweight building spent over 18 days above 28°C (82°F) during an exceptionally warm August, while the masonry building exceeded that threshold for only 8 hours total. The masonry building also needed 67% to 75% less energy to cool to a comfortable set point.
This thermal mass works best when nighttime temperatures drop, which has traditionally been the case across northern and central Europe. Cool night air chills the walls, which then absorb daytime heat before it reaches interior rooms. It’s a passive cooling cycle that kept European homes comfortable without mechanical help for centuries.
Passive Cooling Is Built Into the Culture
Europeans developed a toolkit of low-tech cooling strategies that reduce the need for AC. External shutters, common across southern Europe, block solar heat before it enters through windows. Thick curtains, interior courtyards, cross-ventilation through strategically placed windows, and light-colored exterior walls all play a role. In Mediterranean countries, the midday siesta tradition itself was partly a response to peak heat hours.
Night ventilation, or “night purging,” is one of the most effective techniques. You open windows after sunset to flush warm indoor air and cool the building’s mass, then close everything up in the morning to trap that coolness. In southern Spain, newer retrofit strategies are combining this approach with evaporative cooling systems and double-skin roofs to keep older buildings livable without conventional AC. These methods aren’t just holdovers from a previous era. They’re being actively engineered into building upgrades.
Electricity Costs Make AC Expensive to Run
Running an air conditioner in Europe costs roughly two to three times what it costs in the United States. The EU average residential electricity price in the first half of 2025 was €0.2872 per kilowatt-hour. In the US, the average hovers around $0.13 to $0.17 per kWh depending on the state. That means a window unit or split system that costs $50 to $80 a month to run in the US could cost €120 to €200 a month in parts of Europe.
European electricity prices are higher for several reasons: heavier taxation, the cost of transitioning to renewable energy, and in many countries, greater dependence on imported natural gas. These costs make households think twice before installing and running a power-hungry appliance. For a continent where AC was never standard, the expense alone is enough to keep adoption slow.
EU Regulations Add Complexity
The European Union regulates the refrigerants used in air conditioning systems more aggressively than the US does. Under the EU’s F-gas Regulation, many common high-warming-potential refrigerants are being phased out on a strict timeline. Starting in January 2025, single-split AC systems with certain high-impact refrigerants are already banned. By 2027, most self-contained and monoblock AC units under 12 kW will need to use refrigerants with very low global warming potential, or use no fluorinated gases at all.
By 2032, fluorinated greenhouse gases will be effectively banned from small residential AC units unless no safe alternative exists. This doesn’t mean AC itself is banned, but it means manufacturers must reformulate their systems to use climate-friendlier refrigerants like propane or CO₂-based alternatives. The transition adds cost, limits the range of available units, and creates uncertainty for consumers deciding whether to invest in a system that might need different refrigerant within a few years.
Many European countries also have building codes and landlord-tenant regulations that make retrofitting AC into older apartments complicated. Installing an external compressor unit on a historic building facade may require permits or be outright prohibited in conservation areas. Renters in many countries can’t modify their apartments without landlord approval, and landlords have little incentive to install cooling systems when it hasn’t historically been expected.
That’s Changing Faster Than Expected
AC sales across Europe have surged in recent years, particularly after deadly heat waves in 2003, 2018, 2022, and 2023. Southern European countries like Spain, Italy, and Greece already have fairly high adoption rates. The shift is now moving north into countries like Germany, the UK, and the Netherlands, where summers that once peaked at comfortable levels now regularly breach 35°C.
Heat pumps, which can both heat and cool, are accelerating this transition. European governments are subsidizing heat pump installations as a way to decarbonize home heating, and many buyers are discovering the cooling function as a bonus. For a continent that’s warming faster than the global average, the question is shifting from “why doesn’t Europe have AC” to how quickly it can be deployed without straining electrical grids or climate targets.