Is anyone else having an issue with a toasty second floor? We thought it was crazy to have a 3,000 sq ft house with only one unit for a/c, but our SR assured us that it would be fine "because its energy star." Yeah right!! I am just curious if there is something wrong with ours or whether we aren't the only ones with this problem. There is a significant change in temperature upstairs...it's going to be a long summer.