I've seen heat only furnaces without filters. But with AC, the filter
As to the OP "worth the money". What's a pleated cost, and what's the
Christopher A. Young
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I had a house that apparently had had the furnace run for years with no
filter at all. We added A/C and at the same time a Honeywell
electrostatic air filter. It did seem to catch a lot of mung, but it
took a professional duct cleaning to really get the place clean - some
of the gunk was sticking to the sides of the ducts.
As to the "electrostatic" filters that aren't powered but just replace
the typical pleated paper filters - I have no opinion, but am skeptical.
With the Honeywell, it was nice to be able to run the elements through
the dishwasher rather than having to run to the store. I have to admit
to running the pre-filters through the dishwasher as well despite the
instructions stating that they should be replaced when dirty.
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