Does it work well do u like it? I have a small house, old furnace, big gas bill. I put in extra insulation last yr which helped some but just inefficient furnace. I don't want to spend 4 or 5 g's on a new furnace. I thought if this works it would give me time to save up for a new furnace or even not have to buy one? Let me know what u think of yours, thanks.