[ajg93]

Thanks Hube.

Actually, there are 2 return air vents upstairs - one in the hall, the other in master bedroom. They were both at ceiling level. I just recently closed off the ceiling ones and created two floor level ones. This will allow me to switch based on summer and winter.

Thanks for your insight on the t-stat. I believe now that mine is not properly located to achieve a balance in the house. The current location is pretty much in the living room / dining room area (just a the entrance. And the times where we have the problem is when we are in those rooms (hence you comment about body heat). If I move it, are there any places I should not put it? Are there any risks?

Thanks Again.
Adam