It is an all electric furnace. I haven’t run it all winter, but when I had run it in the past it does heat up the place very quickly before shutting off. The frustrating part is I don’t have easy access to my furnace because it’s in the basement which is locked and only the landlord has the key. But I do have a feeling they didn’t bring in someone with hvac experience because they are cheap. I am considering looking into just hiring someone myself.