One sure way to damage a heating or air conditioning unit is to change parts yourself when you are not a trained professional. Every now and then home inspectors find heating and air conditioning systems damaged by improper part replacement. Sometimes the damage that is done costs far more than the original repair. Many times home owners who desire to make a home more energy efficient by modifying the metal smoke pipe between the heating equipment and the chimney by adding heat sinks. The added heat sinks can dissipate too much heat that should be rising up the chimney, thus destroying the smoke pipe and chimney liner. $20 worth of scrap metal can cause a few thousand dollars worth of damage.

Furnace ac damaged