Hell yea, Its kicked off and on twice since the slab heated up, And stayed on continuous long enough to heat the whole slab and the room to 60 degrees where it is at now and its holding well ( took about 20 hrs straight ). And theres still no insulation in the attic .. That slab heat is unreal, Just radiates from it, and the concrete holds a sht load of heat so I would say it might kick on once or twice every other day nowto warm up the room , but this is so efficient its crazy.. Not to mention its doing all this with no attic insulation ( gonna blow R-25 cullulose which is about 10 inches ) and its -10 below air temp tonight ..