this post was submitted on 19 Jun 2026
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You forget that American houses, especially lower class ones, are made out of practically cardboard or literally foam. While sealing can help a decent amount most older homes are lucky to have R10 insulation total from drywall to whatever external sheeting exists. Even now most new construction only has to be R15.
That means at best you'd be running the AC 24/7 during the summer months if you live in the 80% of the US that gets above 32c for days at a time.
wasn't an issue at the time older housing was built. US population was 1/3 what it is today. There was plenty of oil and electricity to go around for everybody.
It was still an issue, the problem was either you just didn't have the knowledge and/or money to deal with it, were working with bad scientific beliefs based on real problems that were solved differently, or just lived in what used to be a much more mild climate.
In especially the 1930s-1950s the poisonous construction materials did in fact have slowed effects when you had a drafty house, so it became practice and advice to not fully insulate the home, to not create a sealed environment since the homes that did have good insulation and a good seal generally had more 'mysterious' deaths that were attributed to 'stale air' and even brought back the term 'miasma' for a while. It was gas/lead/asbestos/arsenic/CO/CO2/Radon poisoning. But back then they had correlation and used it as causation because why would air ever hurt you.
That and for the most part you had trouble keeping the house warm, not the opposite problem, so the cheapest and time tested solution was more blankets and a stone fireplace for part of the year and just deal with the outside temp the rest of the year, even on really hot days like the record breaking Chicago high of 102 in 1918 where the average was, you know, 80 for the several decades before and after that.