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Our summers in Michigan peak to around 90-100F, winter at night can get as low as -15F in my area, maybe -20F for the coldest night. General summer temps are mid to high 80's though. basically boarder line needing AC vs just windows down to get some air flow.
Every vehicle I've used in the past will cycle the AC pump on and off. The evaporator holds the boiling coolant, and when it's cold the ac pump isn't needed until it starts to warm up (liquid refrigerant all boiled into a gas) and the AC pump kicks back on. Low air flow would make the refrigerant boil away slower, max cold setting might run the AC pump more to keep it cooling at the most it can vs letting it cycle longer cycles. It makes no sense why it would add heat if the temp is set below interior temps, that's only used for defrost generally, ac to remove moisture, then heater core to warm up the air again. I could be wrong, the newer cars seem to do more dumb stuff, but I grew up in 80's to 90's vehicles and I mainly drive 90's era vehicles still. Simplest vehicles and generally pretty easy to work on and don't have a million extra things to go wrong. Then I have the unicorn, the 2006 prius lol.
Funny thing, I don't even know if my AC works in the prius. It seems to deforst the window when turned on, so pretty sure it at least has something for a charge.
@Phase We get some real weird weather here, it has snowed here with the air temps in the 40's maybe low 50's before. Today high was like 62F, low is 35F. Tomorrow says 69 high 40 low. We've had weeks where we are in the 80's and some days it's below freezing. Typical michigan weather, if it's sunny and nice out, you better do something outside before the weather decides to change lol.
Big thing in my area lately has been tons of wind. I'd say this has been the windiest year that I can remember. More wind storms than snow storms, the snow was really mild this year, didn't even need to snow blow the drive way. Year before I snow blowed it 3-4 times.
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