I performed an audit the other day and one of the homeowners' largest concerns was a funky smell in the ducts that serve the upper stories (of a 3-story row home in Washington, DC). The smell is similar to that you will find in a bouse house (i.e. porta-John).
The smell came while running the heat.
The HVAC unit for the upper stories is an air-source heat pump.
The heat pump and d…
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