Jason writes from Sod, West Virginia: "I have a 30'x40' garage with a 12' ceiling heated with a gas furnace which hangs from the ceiling. It is totally open with exception of a bathroom. The furnace heats it quickly but it cools down very fast. The ceiling has R-19 insulation and the walls are R-13 both ceiling and walls are covered with 1/2" plywood. Would adding more insulation to the ceiling make a difference?"

Answer: Yes it will help. The more insulation added to the existing attic insulation the more R-value you will achieve. A higher R-value means a higher resistance to heat loss. You may also want to double check the envelope of the entire structure for other areas of possible heat loss.