On Monday, August 10, 2020 at 4:18:45 PM UTC-4, Dave Smith wrote:
> On 2020-08-10 3:05 p.m., Cindy Hamilton wrote:
> )
> >
> > Heh. We have a sheet of paper affixed to the furnace plenum by a magnet
> > and a pencil hung nearby with a piece of string. At least we know how
> > late we were.
>
> If you went by the calls you get from duct cleaning services saying that
> it is time to get them done again it would probably be an adequate
> reminder for the filter change.

We don't get those calls. Benefit of not having a landline.

We have two filters. One serves as a prefilter. It uses something like
this:

<https://www.grainger.com/product/5W498>

We try to change that once a month.

The other filter is a big pleated job. I think we change that twice a year.

Cindy Hamilton