First I want to say that this is a great site....lots of info in here.

I have lived in my house for 2.5 years(new construction). I house is usually around 70-72 degrees all of the time. At night, morning, and afteroon, it's 70-72 , but around 3pm, the house starts to get warmer. Between 3pm and 6pm the house temp will raise about 8 degress. Then the it takes the whole night to cool off.

Info on my house, the sun sets on the part of the house where there are 3 windows(not very big) and my garage.

Honestly, I have no idea why my house would heat up like this everyday in the summer...it's aggravating to say that least. When I talk to Carrier, they say that this air handler is perfect size for my house. So who knows what to do.

What do you guys think could be causing it? Thanks.