Forced air furnaces are hooked up to duct work and are available in electric, oil, propane, pellet and wood. Most wood furnaces are available with electric or oil back up.
HRV (Heat Recovery Ventilaton)
A Heat Recovery Ventilator is a system which pulls fresh air into the house and pushes stale air out of the house under fan pressure, that’s the ventilator part. The heat recovery part is accomplished by forcing the incoming cold air (in winter) through a series of shallow and broad chambers which are in contact with another series of shallow and broad chambers containing stale warm air going the other way. In this way the cold air coming in is warmed by the warm stale air going out. As homes are upgraded and made tighter (increased insulation, new windows, new doors) the stale air does not escape and the air in the house becomes stale. Some municipalities require HRV’s to be installed in new homes or renovations.