Many houses require substantial amounts of front air to be carry in through their ventilation systems. In many cases it is code ( schools) and in other cases it constitutes make up air for contaminated exhaust air (laboratories). mindless exhausting costly conditioned indoor air and renewal it with outdoor air is really expensive. Energy recovery devises, like the Enthalpy Wheel, can be incorporated in the design to transfer outgoing temperature and humidity (energy) to the incoming outdoor air.
