Keeping a cool head when France melts

As I write this, France has just lived through the hottest day it has ever recorded. On June 23, 2026, the national average temperature hit 29.8°C, the mercury brushed 44°C in the Landes, and the night before set its own record for the most stifling on file^[1]. So the subject is rather on my mind, especially since it's hot enough out there that you wouldn't put a parent in it.

Before we get going, one thing to clear up. This post isn't sponsored. Nobody pays me to talk up any of it. It does carry a few affiliate links to the gear I actually own and use, each flagged where it appears. Go through them and you buy me a coffee at no extra cost to you, and if that rubs you the wrong way, ignore them, the advice doesn't change.

Everything below comes down to one idea, that your body cools itself by evaporating its own sweat, and nearly every good summer trick boils down to making that evaporation easier.

The pedestal fan, and the move that changes everything

The bladed fan is everyone's reflex, the one you haul out of the closet the moment the thermometer clears 30°C. Its job isn't to cool the air, contrary to what you might think, since all it does is move the air around. What it cools is you. By blowing across your skin, it speeds up the evaporation of your sweat, and that evaporation is what cools you down, because water turning from liquid to gas draws its energy from your body heat. The sweat leaves, takes a little of that heat with it, and clears the way for the cycle to start again.

For my part, I run a Rowenta Turbo Silence (affiliate link), and I have no complaints. The night mode earns its name, plenty of airflow for what you need and quiet enough to leave you sleeping, which is no small thing when sleep is the whole point.

One caveat, though, because a fan is no miracle worker. Past roughly 35°C, it just pushes scorching air at you, which can speed up dehydration instead of relieving it, unless you pair it with a little water on the skin, a damp cloth on the back of the neck for instance. The warning comes around with every heat wave, and it's worth heeding^[2].

The trap of ice cubes and passive coolers

That's also why I'm wary of misters and passive coolers built from ice cubes or damp towels. The relief is real, but brief, and it comes at a price. Keep topping them up and you load the room's air with moisture, all the more so during a heat wave, when you keep the place shut all day with little fresh air coming in. Air that's already saturated with moisture slows the evaporation of your sweat, to the point where the heat turns unbearable fast^[3]. Once your body can no longer shed its sweat, the risk of collapse climbs sharply. By the same logic, I'd keep the wet rooms shut too, the bathroom and the kitchen first of all.

There's one exception, the ice pack. Sealed shut, it keeps its water or gel locked inside, releasing not a single molecule of water into the room. The condensation that beads on its surface is drawn from the air already in your home, and it will evaporate back to where it came from once the pack has given up the ghost.

Then comes the exception to the exception. In theory, the freezer that refreezes your pack dumps more heat into the home than the pack will later absorb, since the heat it pulls out has to go somewhere, plus the work of the compressor on top. So the apartment's heat balance ends up in the red. Even so, it stays the most acceptable passive option in my book, because the goal is to survive the heat wave, not to recreate the polar ice cap in your living room. Nobody here unplugs the freezer in summer, I assume, so go ahead and use the ice pack however you like, wrapped in a towel or parked behind the fan.

The turbine fan, king of the cooler nights

Different beast. The turbine fan, or cyclone, is usually a floor model built to blow hard, made for shifting big masses of air rather than fanning your face. People underrate it because it's clumsier than a pedestal fan, wrongly, because its job is something else entirely.

In a room where the air barely moves, the cool air, denser, settles at the floor while the warm air rises to the ceiling, which is what we call thermal stratification. A powerful floor fan, aimed at a wall or a corner, stirs the whole lot and breaks up those layers, so you claw back a degree or two of felt temperature. But my favorite use for these turbines is at night. The moment the air outside drops below the air inside, nothing beats them for driving the hot air out of your home and swapping it for something breathable.

The method, which I call the depressurization column, comes down to three moves. First, set the fan on the floor or at window height, about 1.5 meters back from it, blowing outward at full power, and pick one of the hottest rooms in the home to house it, window wide open. Then open your other windows, favoring, where you have them, the coolest rooms in the place, a garage or a cellar with a window. By driving the hot air out, the turbine creates a low-pressure zone that pulls outside air in through every opening left free, which is exactly why you want to open the cool rooms first.

That leaves the awkward question, why pull the fan 1.5 meters back instead of jamming it against the window. Because a fast jet of air doesn't push only its own volume. All along its edges, it grabs the still air of the room and drags it along, so giving it room before the window lets it move far more air than it would flush against the frame. People often chalk this feat up to Bernoulli's principle, but that's a shortcut, because the real culprit is air entrainment, the turbulent mixing at the edge of the jet^[4]. It's the same trick Dyson's bladeless fan uses to multiply its output, and a short video shows it better than any explanation.

The technique pays off most, of course, when the gap between day and night temperatures is wide. Right now in my part of the country, the night limps down to 26°C around 4 a.m., better than the daytime furnace, without exactly being a cold snap.

Portable air conditioners, a luxury that costs you

We've all seen those little air conditioners on casters, with the exhaust hose you have to seal into a window. I own one, and I'll admit it's saving my life this summer, even if it costs me a tidy sum in electricity for fairly modest results. Two reasons for that.

The first is insulation, because in a home that holds the cool poorly, a portable AC feels good while it runs and for a good half hour after you switch it off, then the heat creeps back in no hurry, at a cost that adds up. The second is depressurization, and it's worth pausing on. The most common models, the single-block kind, draw in the room's air, split the hot from the cold in their evaporator, hand you back the cold air, and vent the hot air outside through the hose. Now we've just seen, with the turbine, what happens when you drive air out of a room without replacing it. By pushing its hot air out through the hose, the AC slightly depressurizes the home and forces the scorching outdoor air to seep in through every other opening and vent^[5]. At night, when the air outside is cool, no harm done. In the middle of the afternoon, feeling 35°C air pour into the next rooms has a lot less charm.

There's a fix, an AC with two separate hoses to seal into the windows, whether you buy it that way or rig up the one you already have. One hose pulls outside air straight in to cool the system, the other vents the hot air out, so the home stops depressurizing and the only air coming into the room is the cold air the unit blows. I've also noticed mobile mini-split ACs turning up lately on the French market, cousins of the ones sold for RVs or across the Atlantic. I haven't lived with one long enough to speak to the install and the best practices, so look into that yourself, but the design is more efficient than the little wheeled units from the start, since the compression block, hot and noisy, sits outside, kept apart from the indoor airflow. That's the whole point of a split.

Dehumidifying, the other reason to love AC

I said it earlier, humidity is your worst enemy when you're counting on sweat. An air conditioner, through simple condensation on its frozen evaporator, mechanically dries the air it sends back to you, the room's water draining off through the condensate line. Even once you've switched the unit off, the air that slowly warms back up stays far more bearable, especially paired with a fan. Very dry air has its downsides, chapped lips and stinging eyes, but if you're still reading me at this point, I'm betting you'll make those small sacrifices, same as I do, to get through it.

And if money is truly tight

Then there's the case where you've got no AC, no real budget, not even the cash for a turbine fan, the baking studio under a Paris roof, the student room, the instant-ramen end of the month. There, you're going to have to improvise.

If you have shutters, keep them closed around the clock, because closed shutters block 60 to 80 percent of the solar gain and buy you several degrees^[6]. With no shutters, an emergency blanket taped over the glass, shiny side facing out, bounces back most of the radiation and limits the damage^[7]. It's a stopgap to put up before the room heats, not a way to claw back a furnace already in full swing, but it helps.

The blanc de Meudon trick

Another bit of magic, strictly for the outside of the glass, is blanc de Meudon, a kind of whiting sometimes sold as Spanish white. It's powdered chalk, near-pure calcium carbonate, and it costs next to nothing at the hardware store^[8]. Mix two parts powder to one part water until you've got pancake batter, a good runny paint. Brush it onto the outer face of the window with a big brush, a sponge, or a roller. As it dries, the mix turns opaque white and reflects the heat by sheer albedo, before it even gets in. It's the same recipe market gardeners paint over their greenhouses in summer. A swipe of a damp cloth takes it all off afterward, and as a bonus it cleans the glass. The only price is that your window goes opaque and the room dims, but you'll always take the gloom over the inferno.

When the home turns dangerous, your options

Living under the roof in a poorly insulated heat sink is misery in summer. Historically, French law comes down far harder on winter cold than on summer heat, and to this day there's no legal maximum temperature past which a rented home counts as unfit^[9]. Still, your landlord owes you a decent home, one that doesn't put your health at risk.

If you're cooking at 38°C through the night, document everything, daily temperature readings, photos, a doctor's note if you fall ill, then put the agency or the landlord on formal notice by registered letter. Be clear-eyed on one point, though, because the courts don't compensate a feeling of heat as such. They move only when the heat exposes an objective defect in the home, windows that don't seal, no ventilation, failing insulation. A few recent rulings have indeed granted damages for loss of enjoyment on that basis, but the trend is slow and cautious.

The one clean line in the sand concerns homes rated G on France's energy label, the DPE, which have been barred from new and renewed leases since January 1, 2025, while rents on F- and G-rated energy sieves have been frozen since the summer of 2022^[10]. Since 2021 the rating has also carried a summer-comfort indicator, sadly informational only, which weighs on neither the grade nor the ban on letting. And since the rating swings a lot from one assessor to the next, don't pin everything on it in the short term. If your home turns dangerous to your health, the priority is to get yourself somewhere safe, a friend's couch, an air-conditioned library, the public pool.

My setup, and a parent's confession

At home, I ended up swapping the bedroom ceiling lights for ceiling fans, the Wind Calm Rattan from CREATE (affiliate link), which I'm delighted with. Stirring the air nonstop, quietly and without cluttering the floor, changes everything on the heavy nights. I also invested in a 9,000 BTU portable air conditioner from Midea (affiliate link), one I switch on maybe ten days a year, like right now. BTUs, or British Thermal Units, measure cooling power, and 9,000 of them come to about 2.6 kW, enough to handle a room of 20 to 25 square meters.

When I come home to 30°C in the apartment, I can bring it down to 24°C, a world away from the 40°C outside. I cut the AC before bed and let the ventilation run all night, and it's perfectly livable.

I know air conditioning gets a bad rap, and the charges aren't groundless, the appetite for electricity, the heat dumped into the street, the refrigerant gases. But as the father of a four-year-old girl, doing without entirely is a feat some days. I make my peace with it in small doses, ten or so days a year, and I sleep fine with that compromise.

So there's my heat-wave kit, built up over muggy summers and nights cut short. None of it will cool the planet, I'm well aware, and that's the heart of the problem, because these record temperatures aren't the exception anymore. Until the next spike, I keep the Weawow app handy to watch for the hour when the air outside finally drops below the air inside, and Scilabus's video on staying cool in summer, which explains all this better than I can^[11]. Until then, hang in there, drink your water, and keep a cool head.