I have a 2010 and we've been full time since 2010. On ours there is no heat vent to the "toy-hauler" room but there is air. Ours doesn't have the bunks, instead it has an office desk setup which we really like. When parked for a month or more, we set up portable shelf's in there for our can goods and such(the Harley is outside). We also use it for a "mud room" most of the time. Coming in the back door with the door closed between the toyhauler room and the main trailer sure keeps a lot of cold air out and we can remove our shoes and coats out there. We've been in the high teens many times. The furnace works good, but draws down the battery. When dry camping we supplement heat with a mister heater with an outside 20# tank(the furnace will put a hurt'n on your battery bank). If in a camp ground, we supplement with two small ceramic heaters cause the electric is "free" and the propane isn't.