I recently moved into a house built to my my specs. I put a lot of effort into making this house as effecient as possible. I used tech shield for the decking, I used blown in celulose for the walls(6 inch walls) and ceilings, bought all new appliances and bought the the most effecient heat and air I could afford. Based on the recomendation of my local ac man I went with a trane xr12 4 ton variable speed heat pump . He did a heat load on the place and said the 4 ton would be more than enough for 2400 square feet. He claimed that I could get 13.5 seer when coupled with varialble speed. After all of this effort, I just got nailed with a $212 bill from entergy. Friend of houses of similar size and builds had bills in the range of $110 to 140. I usually keep my thermostat on 76-78. I have investigated and come up with possible answers to the problem and would like some professional input. I PAID for 10 inches of blown cellulose in the attic( about r38. I got on average about 8 inches. My insulator is coming to fix the problem next week. How much would this factor into my bills? My ac man is coming next week to check his stuff. I have been under the house where all the duct work is and all looks very good. What problems should I look for and what should I have him check. By the way, how cold should the air coming out of the registers be. Mine is about 60 degrees. The house is all brick and is ventilated by a ridge vent.