Oh, OK, yeah. They make a standalone air heater, like the Espar, and I think they make an all-in-one thing, but I don't know much about them. Just from reading people's comments on them here, mostly.
The Espar is the one I know best, and will recommend, but that's because I've got one of those and luv it.
In general, though, unless there's something I don't quite understand (which happens more than people here might think), I'd prefer a generator, a heater and an air conditioner to be all separate units, that way I only lose the one of them if it breaks and needs repair, rather than all of them at the same time.