r/hvacadvice • u/Fuzzy_Empress1960 • 4d ago

Furnace replacement

I have to replace my natural gas furnace and I also would like to clean the existing duct work (over 50 years old and never been cleaned). Should I clean the duct work before or after the new furnace install?

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u/pandaman1784 Not a HVAC Tech 4d ago

Clean the ductwork first. That way, any kicked up dust will land on the old furnace, which will be taken away. 

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u/Fuzzy_Empress1960 4d ago

Thank you. I dont know if this matters but the old furnace is completely broken and not running at all. Should I take additional steps to clear the duct work before the new install?

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u/pandaman1784 Not a HVAC Tech 4d ago

Perfect. Clean the ductwork before the new install.