It's true, but our life expectancy when air conditioning wasn't used was also a lot lower, and life was very difficult outside a small band of areas with good climates (usually cold climates because until the invention of air conditioning, it was much easier for humans to heat spaces than cool and dehumidify them.) And many people in very humid parts of the world had their lives immensely improved thanks to the aircon. Lee Kuan Yew, the founder of modern Singapore, credits [1] the aircon as a core reason for development to even exist in the tropics.
American homes are built cheaply (and needlessly sprawly but that's another story) without any heed to ventilation because the US government has put every policy in place possible to make sure energy prices remain low which has removed any market incentive to decrease energy usage, partially because fossil fuel companies spend lots of money lobbying the government. But strategic use of AC in a properly ventilated home is absolutely life-changing.
American homes are built cheaply (and needlessly sprawly but that's another story) without any heed to ventilation because the US government has put every policy in place possible to make sure energy prices remain low which has removed any market incentive to decrease energy usage, partially because fossil fuel companies spend lots of money lobbying the government. But strategic use of AC in a properly ventilated home is absolutely life-changing.
[1]: https://www.vox.com/2015/3/23/8278085/singapore-lee-kuan-yew...