Mechanical Ventilation with Heat Recovery (MVHR) is a whole-house ventilation system that both supplies and extracts air throughout a property. Heat recovery is a domestic heat recovery system, which is increasingly used to reduce the heating and cooling demands of buildings.
Heat recovery systems typically recover about 60–95% of the heat in the exhaust air and have significantly improved the energy efficiency of buildings. MVHR is usually the best heat recovery ventilation system for offsite housing developments.