I have a oil burner hot air system it will use from 1/4 to 1/2 gal per hour of use i also use the Eden space heaters as needed this winter was not the coldest but Zero and below we get now we are in the 40's and feels warm out to me. I keep a cold home around 60's to as low as 50's but 50 does feel brisk. A cold home kills off the germs no one seems to get sick in winter