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People didn’t “used to be fine” without air conditioning during heat waves in the U.S. - a lot more people *just died*. According to this study, air conditioning has cut heat deaths in the U.S. by around 80% since 1960. papers.ssrn.com/sol3/papers....

papers.ssrn.comAdapting to Climate Change: The Remarkable Decline in the U.S. Temperature-Mortality Relationship Over the 20th CenturyThis paper examines the temperature-mortality relationship over the course of the 20th century US both for its own interest and to identify potentially useful a

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When the first colonizers sailed from England to Jamestown in 1606-07 they lost 1 man on the trip- due to heat. After arriving, they lost 2/3 of the others in 6 months, mostly due to heat and related illnesses. When the first General Assembly sat in July 1619, one of the burgesses died of the heat.

Throughout the 17th and 18th centuries, government was generally on recess in the summer as most officials were back home on their plantations on the rivers where it was cooler. Virginia vernacular architecture is almost entirely based on keeping houses as cool as possible in the summer.

Also, places like Phoenix were barely inhabited by white people before air conditioning, and the indigenous people who were in the area before colonization had other techniques to handle the heat. Even hot places like New Orleans that were inhabited built differently than most homes today.

Sorry, I should have prefaced my last reply with a disclaimer that I was pointing out a minor technicality. I'm not trying to claim that 100-degree temperatures aren't dangerous, or even that evaporative cooling is very effective at those temps.

And unfortunately, heat deaths are still massively underreported/undercounted (I believe by design here in AZ). The powers that be hate the headlines + press attention even though this is a massive public health crisis. www.abc15.com/news/local-n...

abc15.comUncounted: Arizona's largest county may be overlooking many heat-related deathsCommunity advocate Stacey Champion said there needs to be a more standardized way of counting heat-related deaths in Arizona.

More than 1000 people died in the 1995 heatwave, mostly in Chicago. We were road tripping cross-country and turned around in Iowa because the A/C in our little car couldn’t keep up with it. On the radio they also talked about livestock deaths—chickens were dying and exploding as they decomposed

Having briefly worked for an AC repair company a looooooong time ago, I still remember anyone calling from a single-unit residence reporting their one & only AC system as "busted" or "out", etc, IMMEDIATELY got bumped to the top of the priority list. Because yeah. Without AC, people literally die.

i had a landlord try to strong arm evict me when I was having benefits issues by locking out the electricity in July in the south. I have a heart condition (and a feeding tube). the utility company had me on the priority reconnect list and the judge was NOT amused

Our AC is limping along now for about two weeks now. Replacement is this Thursday, but for two weeks the lowest it has been in the house during daytime is 77F. It tries to catch up overnight, by me trying to thaw out the AC coils. :-/

And temperatures in 1960 weren't anywhere near what they are today. bsky.app/profile/fain...

Faine Greenwood@faineg.com

People didn’t “used to be fine” without air conditioning during heat waves in the U.S. - a lot more people *just died*. According to this study, air conditioning has cut heat deaths in the U.S. by around 80% since 1960. papers.ssrn.com/sol3/papers....

Wow. Did not know that. In addition to other points people have raised about populating & city heat islands, let's add: Summers really are hotter than they were in 1960. Also architecture is different - southern houses used to be built to get the maximum shade & breeze possible, but now they aren't.

There's an argument I've read about suburbs in grad school that says that it's because of the development of affordable consumer AC that the sunbelt was able to grow in the US.

Local high schools (Dallas) have been building roofs over their football practice fields so the boys have shade while they're out running around. Evidently there's also supposed to be a wind tunnel effect to keep a breeze going.

i remember the first year i moved to california i think there was a major heat wave in chicago and around 500 people died! friends were freaking out that i moved to earthquake country and i don’t think we have had 500 deaths from an earthquake since 1906?

I suspect some of that is climate change. That is, we forget how far *north* Europe is; most places would never hit 80 degrees regularly even when I was raveling there 30 years ago; a 100-degree day in New Hampshire when I was a kid was *very* unusual and summer nights could get pretty cold.

There wouldn’t be nearly as many people living there if there wasn’t AC. You can’t just say “no one needs it anymore.” They also built things different for A/C. Also a lot of old people there, the death toll would be immense.

It would be pretty rare to find a vehicle like that for purchase in US now. Just don’t see the kind of “strippers” you used to see, and they are even rarer to show up on lots & some won’t let you order specific options & you wouldn’t be able to see it first

Like the Pacific NW and other northern areas where AC has not been a regular thing (getting more regular with climate change). I was so happy a few years ago when the first of the big "heat dome" systems hit Seattle and my parents had already put AC into the house they had recently moved into.

My wife grew up in Charleston in a small house with no air con. I've always been amazed on what they did to keep the heat on the body down. On the other hand I grew up in New England where air cond was not needed (mostly) nor installed even if you could afford it.

Yup. Mass deaths from heat waves used to be a common thing. "On May 10, 1896 most of the Eastern US was over 90 degrees ... By the time it ended in mid-August, 1500 deaths from the Midwest to New York to New England had been recorded." historicipswich.net/2025/06/23/n...

historicipswich.netThe Deadly 1896, 1911, and 1936 New England Heat WavesA heat wave during the summer of 1896 produced 1500 deaths from the Midwest to New England. Fifteen years later the record for heat-related fatalities was broken. July 1936 remains the warmest U.S.…

Vancouver, Canada 2021 was hit by a heat dome that locked in temperatures in the 100s. The high was 104 F. Over 600 people died in a week, most on the weekend. This is a city where summer temps used to be in the 70s and it rained. Now, we're in a 6 year drought and temps of 90+ are "normal".

And '96, '97, '98. I drove up to Chicago in the summer of '99, to meet with an online group from the old Yahoo user-created rooms. All it took was 15 minutes trapped on the El, staggering back to the hotel afterwards, and 30 minutes of the Blair Witch Project, for me to be vomiting and incoherent.

Plus not everyone can afford to or has the means to "beat the heat". Depends on where they live and what they can afford. We didn't even have an AC unit til.... I think I was in middle school? We only had a window unit on the 2nd floor. Otherwise we huddled in the basement or went to the lake.

We have back up generators in our Assisted Living just in case of a power outage. I mean aside from O2 tanks also for AC and temperature control. Without AC trust me alot of seniors would just straight up pass out walking to dinner. We have to remind many just to drink water to stay hydrated.

Then of course plenty of other things in any sort of healthcare facility. However AC is incredibly important during summer. It is VERY easy to get dehydrated just from sweating and not realize. Heck us workers do it sometimes and have to sit down and just chug water when we realize it cuz busy.

Don't disagree with your line here. But negative attitudes to 'unnecessary' AC in Formerly-Temperate Zones were formed not from CO2e global warming or energy use worries, but from Ozone depletion, refrigerant pollution and (to some extent) Legionnaires' Disease worries. Those were the news stories.

In 1985, 28 people died in Staffordshire from a Legionnaires' outbreak, stemming famously from a hospital's AC. Not sure what mid-80s heat death figures in central England were, but they weren't in the national consciousness.

Things were so bad in the US that, before the invention of home cooling, the government pushed for window screens in the south. Because people needed to open windows to not die, and then they got bitten by disease-carrying mosquitos and died.

Listened to a discussion on a podcast recently about how homes in London don't have screens. It's been very hot so windows are open for airflow and mosquitoes just waltz in and bite everyone. Obviously no AC, so the need to open windows.

Window screens in the US are ubiquitous because of that push, which was back in the 1920s or '30s, as I stated. They are almost unheard of here in Ireland, and I am told that's pretty consistent across all of Europe.

Exactly. They aren't precisely universal. In houses built pre 1900 especially, you're more likely to find windows that never had them at all. Helped my sis move back from a very old duplex in PA several years ago, and we had to sleep during day/work during night to cope w/o AC or proper vent.

Before I had whole house AC, my dog nearly died of heatstroke watching tv w me during a heat wave. I had to move her into a bedroom & crank the AC to revive her. (No AC in tv room, no tv in bedroom) She lived two more years thanks to that air conditioner.

Yep this is why I'm so hardcore about keeping at least one room at or below 26C at all times with my girl. I can suffer in heat because I'm a human. She literally will just die.

I grew up in Georgia. Mowed lawns all summer in the heat (you’re acclimated when you’re born in it). Moved to Philly 20 years ago. Summer here is now like GA in the 70’s-80’s. Winter as well. Georgia peaches aren’t much of a thing anymore. Not enough ‘cold hours’, so trees produce much less.

My grandparents were from Virginia, Tennessee & Mississippi. Told me various stories of how nice it was to sleep outside under the stars but how it was also necessary due to it being so hot.

So interesting, thank you! These images provide a completely new view of life back then for me. (The men continuing in suit jackets, buttoned shirts, and ties tho, yikes - was this due to standards of "propriety"?)

The wealthier cohort would have suits and shirts that were designed to better contend with the heat, but there is a lot of writing about how propriety would go out the window once the temperature got high enough. People might've popped everything back on for their photo to be taken though.

Yeah the plot of Rear Window has a couple sleeping on their balcony every night. I'm the only person I know with AC at home (portable unit) — but I'd be sleeping in my van with the doors open this weekend if I didn't have it.

OTOH I work from home sitting on top of a workstation pumping out 800w of heat half the time so it's a necessity once I can no longer blast in outside air to keep things cool.

No, I didn’t. Thank you. My point is that people did things that are inconceivable today to try to adjust. My point is to accentuate how different behaviors were - to help understand how different the world pre ac was.

Seems like that's the case for so many "people used to be fine without" statements More people died. And they were usually "out of sight, out of mind" Same for public health. Disabilities. Chronic illnesses.

In the Southern US, people also used to die of insect-borne diseases because they sat outside on the porch to catch a breeze. The diminishment of malaria in the south (the reason the CDC was founded) was due to rural electrification as much as to DDT.

This tendency to AC-shame people helps nobody, better to encourage reconsidering the use of AI, chatgpt, etc. if you're concerned about carbon footprint/energy conservation

People in tropical climates don't die en masse when temperatures reach heat-wave levels in the US or Europe, but they don't try to live an American or European lifestyle. Buildings are designed to stay cool, people rest during the heat of the day & do more at night & the overall pace is slower.

One of the difficulties with designing buildings to stay cool is that it is *very* climate specific. When that changes even a small amount, the same design doesn't work anymore. Some passive cooling strategies can even make things worse, for example stone buildings during prolonged heat waves.

It's /possible/ to build tropical architecture that doesn't cost a lot to heat, at least with modern technology, but the vast number of doors and large windows that seal and insulated well when closed gets very expensive.

Well, sort of. They don't build with cross ventilation in mind, that's true. On the other hand, insulation and air sealing are a way of building to stay warm and they make both cooling and heating cost less.

I remember going to the mall in the 80s and they were setting it up as a cooling shelter, bringing in cots and setting them up in rows because it was the only place in town with AC. We camped out at my dads office for over a week with like 10 other families, one summer because there was AC there.

My friend @miniver.bsky.social 's mother died of heat last year, because the power company turned off her power. See his heartbreaking post and link about this here: bsky.app/profile/mini...

Jonathan Korman@miniver.bsky.social

I put together a proper website ❝ My mother Kate Korman owed $500 to Arizona Public Service, so shortly before her 82nd birthday they cut off her electricity. Temperatures were in the 90s and climbing. Without air conditioning, the heat killed her within a few days. ❞ www.apskilledmymom.com

And some places, like Vermont where I live, are just hotter now. I’ve lived in the same house for 18 years. It used to be fine all but one or two days a year without AC. Now I need it for weeks. Nights don’t cool down anymore, that change has been pretty dramatic in the last about five years.

Doesn't do much good to criticize the US on the topic of climate control behavior, if you're going to use a temperature scale that A LOT of US residents don't even really understand. They mean we should keep it at 72 instead of 68. Except that, precision like that is hard with 21st C indexes.

Yes, Im agreeing with you about the silliness of the anti AC thing. People couldnt live in large parts of the South or SouthWest US without modern AC. Likewise, large parts of Northern Europe and Canada with heating. Imagining a "world without these things" is just regressive fantasizing.

Its in the same genre as posts about how far your food has travelled, and how we should all grow our own vegetables. I mean SURE, I think we could all benefit from buying local, in season etc. But returning to even a partial subsistence farming model, is a delusion of people with no understanding.

In the US, people with money went to the mountains or seaside. Newport, RI was a summer colony, and so was Mt Desert Island & Kennebunkport ME—and then there were Cape Cod, Martha’s Vineyard, Nantucket & Oyster Bay & the Hamptons, plus summer “camps” throughout the Appalachians.

I mean a number of factories stopped first shifts and would only run late 2nd/3rd shifts due to the heat. That still happens with some factories due to heat. We have a corrugated cardboard factory here that won’t run 1st in summer due to it.

Some, yes, but more so productivity. Can’t run a line when you have to stop it every 10–15 min due to fall outs. Disruption due to medical interventions and product get wrecked due to missed step on line. Little to do with concern for workers.

It is fascinating to learn about the ways that indigenous peoples of the Southwestern US engineered buildings and air vent systems to provide cooling. Always floored that people lived in Arizona for thousands of years when I visit there. It's so hot!

When I was in HS (early 90s IL) we had student walkouts because they refused to ever cancel school despite 100ish heat indexes, none of the schools having AC and some kids getting very sick. It's such a relief to see my nephew's school have temp-based cut offs and real recognition of reality.

Precisely. Son recently got promoted to forklift work outside, and I was impressed/relieved that company encourages frequent breaks, water station visits, etc. to stay functional - b/c it's the only way a human brain can function in that environment! Ignoring extreme temps effect on the body is 🙄

I lived in France during the 2003 heatwave: thousands of people died. A cardiologist acquaintance, in charge of an in-progress new hospital, said they requested adding air conditioning to prevent the deaths seen the previous summer. Moved to SC 19 yrs ago-1st time I’ve lived with AC ever. A must!

Every single Californian I’ve spoken to who lived here more than 20 years ago insists - and will, to their dying day - that “you didn’t used to need AC here”

Even today, people on the eastern side of the peninsular Santa Cruz Mountains will insist “the fog will come in” and cool things down at night. Meanwhile my mother-in-law finally put in air conditioning - in only one floor of a large house, mind you! - in the last ten years.

Yes, but as heat stress increases, air conditioning becomes a matter of life support over large parts of the year, and a power failure leads to massive death. Adaptation will require development of much more reliable grids, but still, you lose the freedom to be outdoors. (And what is the...

... developing world, which can't afford air conditioning, let alone rock-solid grids going to do? And are we going to air condition all the elephants and tigers?) We are going to have vastly increasing risks from heat stress, ...

... but the right adaptation response is air conditioning for survival (fed by renewable electricity) and rock-solid grids.Accompanied, of course, by decarbonisation. Way better than solar geoengineering, which just sets up the world for catastrophic termination shock in the future.

Meanwhile the UK is trying to prevent uptake of A/C. The government provides incentives for heat pumps for heating but not if they cool as well. New build flats have insulation standards that turn them into ovens, yet don’t come with A/C, and freeholders won’t allow A/C units to be installed 🔥

Not that it’s a competition but 30C all week in mine, and a few years ago it was up at 34C during one of the intense heatwaves. Only going to get worse from here 🫠

And they are fundamentally the same technology, in fact for the vast majority of our existing housing stock a/c is a cheaper install than a heat pump as it doesn't need any replacement pipe work and will be more efficient.