A heavy duty timer would save you enough money to pay for itself in a month or two. I have to leave mine plugged in all night as I get called out at all hours and hate to cold start it and go. One good thing about the calls is that one call pays for the extra lectricity for a couple months. My bud has his timer set for a couple hours in the morning and that's plenty for him. Seems like it takes a long time for heat in the cab,even though the thermostat works fine. Cold blooded beasts... lol