For the 4" media filters, once per year should be fine. In my previous home, I had a Carrier Infinity heatpump system and, as part of the daily duct assessment, it kept tract of the changes in static pressure associated with the filter "filling up" and alerted you when the static pressure hit a threshold that warranted a filter change. It was typically about a year. It was larger home than most of the Villages homes and the system ran more than the systems here because of a longer heating season.
Quote:
Originally Posted by KeepingItReal
Filter should be changed every 6 months..
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