Paid for a new furnace and airconditioner in 2002. House is 1350 sq ft. They installed a TRANE 40k btu furnace. It never really heated the back rooms. After the furnace started leaking gas on Friday, I shut down the gas in line to the furnace and power off. I looked for a new furnace and found my house needs a 60k btu (40-45btu per sq ft = 45 x 1350 = 60,750 btu. For 17 yrs we had cold rooms using space heaters. I wont buy a TRANE or deal with this guy again.