Coach Tim explains heat runs and cold air returns to the furnace - something that is essential to tackle in your renovation project.

Components of a forced air system: a fan draws air from the house into the system through return air vents. During cold weather, gas burners create heat in the heat exchanger, which in turn heats the air. The hot air goes up into the plenum and from there flows to the supply trunk line where it is distributed through vents throughout the rest of the home.

The conditioned air then re-circulates back into the system as needed. During hot weather, you turn on the air conditioner and cooling coils inside the plenum then cool the air, which is then distributed throughout the house.

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