Change Your Furnace Filter Before Its Too Late
The average filter should be replaced or cleaned every 3 months, unless you have pets, then it should be done every 2 months. If you happen to be doing construction in your home, replacing your filter every month will save you some headaches. Electronic air cleaners have a different set of rules, so make sure you read the manual. When you need to call a tech to come and replace a high limit switch that will fault due to air flow restrictions from your filter being clogged, it’s going to cost a pretty penny. You can avoid this by changing them at regular intervals. I go by the seasons in my home and change mine on the first day of the new season.
Types of Filters
It is best to do your homework. There are many types out there for reusable filters, or disposable filters. Some are hypoallergenic, and some are just standard fiber filters. I prefer the latter, but there is nothing wrong with any of the higher end dirt and dust removers.
When considering disposable filters, the more air flow, the better. In my experience I have seen multiple furnace emergencies where I have been called out on a cold night because a furnace can’t move enough air. This is due to the filter being dirty, it is just restricting the air flow so much that the burner gets too hot and trips the high limit switch.
Furnace motors, where the filters are changed often, tend to have a greater life span. Furnaces with no filter, or clogged ones, have motors that work harder than they should have to. A well taken care of furnace will last you 20+ years with very little maintenance, and you will rarely find yourself in a bind at -30 to -40.