We just installed AC this spring here in Colorado, and the timing was good, as we just clocked about 22 days in a row over 90 degrees...set a new record here. (In central Texas, this would be called 'moderate summer weather".) But the weather in CO is usually more moderate than this, and humidity is seldom over 30%.
I guess I'm the dissenter about seasons - I'd much rather it was 50 or 60 degrees outside than 80 degrees. I can always throw on a sweatshirt or jacket. Fall and Spring are my favorite seasons. The biggest problem I have with winter isn't cold, it's the short days resulting in me having a complete lack of ambition to do anything, as it's full dark when I get home from work.