I think theyre pretty expensive but a lot of big trucks these days run stand alone generators that run the heat in AC while they're parked so they don't have to idle their trucks all night or for a few days if they have to reset for 34 hours. They run on like a real small 3cyl kubota diesel I think. Over the road drivers can justify them because they will pay for themselves after awhile by saving them fuel but I don't know how well it would work for you. My best friend owns a diesel shop where they install a **** ton of these. Ill ask him about it, maybe you can find a used one somewhere.