I had a friend once who had a Neon (remember them?) and she constantly had a problem with the a/c. She'd get it fixed and two weeks later...it'd go again. We made jokes about redneck a/c (roll down the windows and drive fast) but it was pretty miserable.

Difference in temps is the difference in where we are located. We still have the effect of Lake Ontario...at least until later on in the summer when the lake wanted is warmed by the hot temps. I hope you stay comfortable.