Our builder is reccomending a ventless gas fireplace for our new home, but we're a little bit leary. We've currently got a gas fireplace, that vents through the roof, and we use it all the time in the winter. I'd say it's the primary heat source for our great room, because I'm weird and hate our furnace. (It keeps the living space toasty warm and the bedrooms ice cold, just the way I like them.) Anyway, we want to use the new fireplace roughly the same way. Will a ventless actually heat the same as the fireplace (Heat 'n' Glo) we have now? Are there negatives to having a ventless model? And, lastly, any models you'd reccomend, or avoid?

Thanks in advance for any advice you can offer!