Tip #6Insulate your duct system.
Duct losses from heat gain in hot attics or heat loss in cold basements or crawl spaces reduce your comfort, wear out your HVAC system and waste energy every time your unit turns on. Then, while it's off, heat moves readily through the ducting wall and either chills off or heats up the air inside. There is no need to replace your existing ductwork. A trained installer can complete the job in half a day
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