Short YouTube clip (by Derek Cole) explaining that residential heating/cooling discomfort can originate from three main areas: the HVAC unit, the duct system, or the building envelope. A fault in any one (or more) of these three can cause occupants to feel uncomfortable.
People want to think that if they're having a cooling problem or heating problem is just the unit, where it could be the duct system, it could be the house, the envelope. It could be all three having problem, or it could be just one of those three having a challenge. But one of those three being off is going to cause you not to be comfortable.
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