Funny you mention this, I got home yesterday around 5:30 and immediately noticed the house was warmer than usual. I looked at the t-stat, it was set on 77 which is where we always have it but the registered INSIDE temp air was showing 79 on the t-stat. We run ceiling fans and the inside of the house is very comfortable at 77, I think a lot of this was me and the wife blowing 32 bags of insulation about 4 years ago in the attic which really helped the power bill and inside comfort. The outside temp was really high yesterday at 99 to 100 so me thinks the 3 year old unit was just trying to do its thing and keep up with the hot outside air. After the sun started setting around 8pm things got back to normal inside