Quote:
Originally Posted by bobkatfly
Yes, this is usually what causes this noise. I had a house in Nashua with a forced air system that did this. The thin wall duct systems that don't have adequate bracing do it all the time. They expand (belly out) when under pressure and temperature and suddenly contract (belly in) when the fan stops. It can be worse if the ducts are insulated because the metal gets hotter.
Has this just started or has it be doing it all along?
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Forgot to preface this conversation, by saying I now live in S.C. near Hilton Head Island...
This noise has just started, however, this has only begun since I just started using the 'Heat' for the season, up to know I've only been using A/C.
The heat only kicks on during the night, when temps drop below 50 degrees.
After about 9am, the heat does not come on.
When the A/C/ was on, I never heard this noise.
Thoughts ?