Preheated fresh air is supplied to bedrooms, the living room and family room. Stale air is removed from kitchen, bathrooms and laundry areas. Locate both supply and exhaust vents in or near the ceiling of each room. Undercut doors about 1 inch to provide circulation between rooms when doors are closed. In addition to continuous low speed operation, blowers are controlled by variable speed control switches located in kitchen and bathrooms to provide increased ventilation rates when cooking or after showering.
Ventilation also includes the type of heating system installed.
In the STS house, electricity, natural gas or propane can be used for supplemental heating. Electric heat can be supplied by baseboard units or radiant panels. Natural gas or propane heaters must be chosen with greater care since they require air for combustion. In a conventional house, this air is supplied through infiltration. However, in the STS house where infiltration is minimized, a different method must be used.