Plot: Our master carpenter sees how the faulty east chimney has been fixed by specialist Mark Schaub and his crew: the game room fireplace is bricked over, but the guest room above gets a new hearth, firebox and gas ""coal grate. "" Richard Trethewey shows Steve how he's using a beat-up airhandler to provide dry, clean temporary jobside heat and gives an overview on how he plans to heat and cool the house - radiant floor heat on the first floor, flat-panel radiators for the second and third, and a/c only in select rooms on the second and third