My garage is 30x33 and I use everything but where my wife parks her car. I heat it with a bigmaxx 50,000btu natural gas furnace at 68 to 70 degrees all winter. I have r19 in the walls and r30 in the ceiling. It cost around $120 extra a year on the gas bill. I spend all day out there except the days hosting at the club shop, normally that is 1 four shift a week.