I'm on the other end of the temperature spectrum here, and I just got my first cab tractor this year - used 2017 JD 3039R. Back around July 4th we had a really hot and humid run and I mowed all day in 90 degree humid weather, which is as miserable as it gets here - and as anyone here can tell you - it was miserable this summer. The tractor cooled fine in that weather with a very hot sun, but I wouldn't call it freezing cold in the cab. it was very comfortable and I didn't sweat at all during this time. What I can add as a cab owner - I find that I need AC any time the weather is sunny and 70 degrees, though I am very much looking forward to having heat in the sub-32 degree winter weather. I'm glad I waited for the right used tractor and didn't cave in and consider an aftermarket cab tractor without AC, because in my opinion a cab tractor without AC is a greenhouse.