DerbyDad03 wrote:
On Feb 18, 9:34 am, wrote:
The best thing to do is see how fast they get dirty in your
particular application and adjust accordingly.

Of course. Past experience already tells me that "2X a year when the
ambient temps are appropriate" will not be enough. There will still be
periods during mid-winter in the north-east when the furnace will be
cycling while the filter is drying, thus the reason for the question
in my OP.

The filter will dry in minutes with the fan running. Don't worry about it.