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'''Energy retrofit''' is a process through which the energy consumption of an existing [[building]] or home is reduced. Properly execusted retrofits consider building as a sustem approaches that examine the reductions that are made possible by [[retrofitting]] related systems in combination. For example, when old heating system are replaced, the building envelope should be assessed. A smaller, more efficient [[furnace]] might be intalled if the [[air leak]]s and insulation levels are addressed.