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Old 2017-11-30, 10:14 PM
Mark & Lynda Mark & Lynda is offline
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Join Date: Feb 2006
Location: Stouffville
Posts: 2,621

Have you ever changed the filter? May to Nov is 6 months and if you've never changed the filter it could possibly be 9-10 months old assuming the furnace ran in the winter during construction.

The filter should be changed quarterly (every 3 months).
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