YouTube video (creator: Derek Cole) explaining that home energy efficiency depends on three factors — the HVAC unit, the duct system, and the building envelope — and emphasizing that sealing the duct system is a practical way to save energy alongside upgrading the unit.
There are three factors to every single home. There is the unit, the duct system, and what we call the envelope, which is the house. If one of those three are off or having a challenge, you're not going to be efficient. So the secret, the key to saving more energy outside of your unit being changed out to more efficient also comes from sealing that duct system.
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