If you have 1" filters, do a search for "air filter whistle". It is a
simple two piece plastic device you put in the filter that whistles when
the filter needs to be changed. Got mine in a kit from the local
utility company.
Here is a description:
https://yourfilterconnection.com/blogs/help/what-is-a-furnace-filter-whistle
Caution - If you have a newer HVAC system still under warranty, you may
be required to use the specified filter for the warranty to be valid.Â
My installer made sure to point this out. My Lennox MERV 16 filters run
$70 each in a two pack, but last 9 months with two shedding cats.
Brian
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