Yes, the supply vents are in the ceiling. Furnace is a Coleman, but I don't know what model. Thanks for the belly repair link.

Thanks for the info Robert. So let me get this straight, if I reseal the underbelly membrane then technically I should solve the return air problem, correct? There are numerous holes in the underbelly where plumbing repairs have been made. We have 3 floor registers in the unit which are basically ju...

My mother in law just bought an older MH ('72). The furnace was replaced in '98 with a Coleman... don't know the model. She's been having really high PGE bills and thinks a lot of it is due to heating (she likes a warm house). Just last week the furnace started acting up... it just wouldn't fire up....