this has been an issue since I purchased the home two years ago. Anytime the HVAC turns on a significant amount of air is drawn into the home from the attic through open back ceiling lights, cracks in the windows, and the chimney if the flue is open.. there’s enough flow, that if you had fire lit and turned the HVAC on the fire and smoke is drawn into the home.. I have inspected all the ducting in the attic and found no cuts or disconnected registers.. the only item left is the unit itself which is roof mounted.. any suggestions to diagnose this issue or should I just call an HVAC company at this point?
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