Currently using #20 of propane daily. Thermostat set to 70 with outside temperatures mid 20s at night and 40-50 during the day. I have dual pane widows and no obvious drafts. You can feel the cold at the windows, but no drafts.
I was expecting to have propane for at least a week with 2 #40 tanks.
Do you find my propane use in the normal range to be expected?