Built my place in 93. Did most of the work myself so I know whats in it. 2 x 6 walls with 1 inch foam on out side. Ceiling has 18 inches at least of fibreglass. Scissor trusses in center for a vaulted ceiling. One story ranch. I though I did everything right. Low "E" windows, foam, sufficient attic venting, 93% high eff. furnace. But man, my AC runs alot! Granted we are in a HEAT WAVE in Mich but with 95 deg and mild breeze my air runs every ten minutes set at 77, shades drawn, little in and out traffic. In the winter, a 30deg day with a breeze is worse than a 15deg calm day. I know my windows are of poor quality(my fault, Caradco junk) but I figured I had an really efficient set up. I'm thinking of paying the $3-400 for an energy consult to see where my losses are. I just don't see my design as such a bad one. My folks live next door in a 1967 ranch, brick face 2x4 const with new windows (Marvin) and do way better than me! What gives??