I had a new home built in late 2007. Since that time, we have had problems cooling the house. After conducting an energy audit through the electric utility, we found that some areas of the house were NOT insulated, and the whole house was insulated at below-code levels. The air conditioning unit is also too small for the house, and can't keep up with the summer heat (2.5-ton unit, instead of 3.5 or 4-ton unit). The findings of the energy audit suggested $10,000 in repairs to ensure the house can adequately cool in the summer. What options do I have? Should I try contacting the home builder directly? What do I do if they balk at the claim? Do I have to pay the $10,000 to fix the home builder's lack of oversight on their subcontractors?