I know I need to inspect the filters in my heating and
ac system every three months. OK, I just inspected
them. What am I looking for? On a visual inspection
the filters look just about like the ones I have
standing by to use to replace them. So how do I tell
when they are due to be replaced?
Thanks a lot for any answers.
Are you removing them and looking at the backside? Usually the topside
looks fine even when the are clogged completely. I personally don't
think once a month is too often to change the common type filter, they
only cost about a buck, and with soaring energy costs, how much fuel do
you want to waste on a dirty filter?
If you just have the replacable filters, replace them every month . Use the
ones that are about one dollar or so each and not the more expensive kinds
that say they are good for 3 or more months. Some months they will not have
hardly anything on them as you may not run the unit very much, but it is
just good to pick a day, like the first or last day of the month and change
them by habit.
I suspect there is a catch 22 here. The really expensive filters that
fit in the stock location are so restrictive that they are like using a
partly clogged filter even when new, and will cause loss of efficiency
and waste of fuel. If you really want to filter the air well and not
lose efficiency you need an accessory filter with much more surface
area so the 11 micron filter (or whatever micron size) can pass enough
volume of air to allow the HVAC to run efficiently.
Otherwise the "trash" filters are the better bet.
Those filters aren't supposed to remove fine particles - they're
supposed to protect the HVAC equipment, which can be damaged by larger
particles. If you want to improve the air quality of your home, get a
dedicated air filter appliance.
I use the puralator fiber filters (cheap ones). I buy them by the case and
spray a new case full with WD40(used to use Filter Kote) and let them bake
in the sun for a day to remove volatile compounds. This makes them really
sticky. When I use these treated filters dust usually only penetrates just
the surface of the filter. My filter holder will hold 2 inch thick filters
so I use two 1 inch ones. When I change filters I move the bottom filter to
the top and put the new filter on the bottom. Ive been doing this for about
15 years and will testify that this is probably the best use for WD40 I have
found and I am no fan of WD40.
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