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Some people are just low thermals, meaning we thrive at lower temps and suffer in warmer ones. There's nothing we can do about it; as much as the travel industry would have us believe that laying on a beach in the sun is a good thing, we low thermals consider it torture. And low thermals and high thermals often have thermostat issues between themselves. (I grew up with two extremely high thermals; one lives in Vegas, the other in Phoenix, and they are delighted with the weather there. I'm a low thermal, and I absolutely can't stand the heat; I had heat exhaustion at least twice a summer growing up in Arizona, and my parents couldn't understand why I chose to work graveyards during the summers. Colorado is too warm for me; I'm thinking Montreal or St. Petersburg, or possibly Buffalo with summers in Patagonia.)
On the other hand, if this is a new thing, temperature variation intolerance can be a sign of a medical disorder. People who once handled X weather just fine and now have problems with it may have hormonal issues. If this is a sudden change from his previous behavior, you might want to ask him to see a doctor.
The other thing is if this is a change from previous years, compare almanac readings. Is this summer more humid or less humid on average than previous years? Humid air holds heat better, so it's harder to cool a house when it's humid. If that's the case, look for a dehumidifier to have added to your AC. If it's a drier year than normal, look into a portable evaporative cooler. Air that is too dry will feel warm even if it's cool because humans associate cool and wet (because, before refrigeration, anything that was cool was necessarily wet thanks to condensation.) Also, air circulation improves the cooling effect of AC, so investing in ceiling fans or punkahs (stiff paper stretched over frames that attach to the ceiling on one side and are flapped by either someone rocking in a chair with the chair attached, pulling on the cord, or by a small motor) or, if you can handle the constant white noise, floor fans, are a good, cost effective measure.
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