What is the square footage of your house? How old is your air conditioner? • Age of Air Conditioner   1 year 2 years 3 years 4 years 5 years 6 years 7 years 8 years 9 years 10 years 11 years 12 years 13 years 14 years 15 years 16 years 17 years 18 years 19 years 20 years or longer How old is your furnace? • Age of Furnace   1 to 10 years 10 to 20 years 20 years or longer