HOME Replacing Furnace Filters Folks in the heating and air conditioning business are always talking about the importance of changing furnace filters. There must be a reason why.
Most furnace filters are inexpensive, disposable and easily replaced.
There is no good reason to neglect them. Severely clogged filters can cause the unit to overheat and, according to some experts, can lead to premature compressor damage in air conditioning systems. Check your furnace filter monthly. In fact, some people would say that if you are going to go to the trouble to pull it out and look at it, you might as well go ahead and replace it. If you use the more expensive disposable filters designed to filter out allergens and extremely small particles, you may want to hold the filter up to make sure light still comes through it easily, but even these filters should be replaced at least every three months.