Why is the air coming out of my furnace lukewarm?
Why is the air coming out of my furnace lukewarm? Air ducts are leaking. The lukewarm air coming out of your furnace can also be the result of leaky air ducts. If your ducts are leaking (and ENERGY STAR says that almost all homes leak about 30% of the air in their ducts), cold outside air is making its way into your ductwork. Why does my car heater not feel warm? There are hoses on each end of the heater core, both of which should feel warm when the engine has been running and is at operating temperature. If air...