5 Signs the Furnace Filter Needs Changed

The furnace filter needs to be changed regularly to keep everything running smoothly. However, it can be difficult to remember the last time it was replaced. If this happens, keep an eye out for these five telltale signs the furnace filter needs to go:

  1. Overheating Unit

A common sign that the filter is overdue for a change is an overheated unit. If the unit begins to get too hot or is expelling hot air when it shouldn’t, the furnace filter is past it’s prime. If left to overheat for too long, the unit could start experiencing problems and possibly breakdown.

  1. Dust

Another sign is the accumulation of dust on surfaces in the home, especially near the vents. Clogged furnace filters have a harder time removing dust and pollutants from the air.

  1. Allergies

Homes with allergy and asthma sufferers might notice more symptoms if the filter is clogged. It’s important to maintain good indoor air quality in homes that experience allergies and asthma, so they might need to change their filter a little more often than others.

  1. Increased Electricity Bill

Has the energy bill gone up over time for no reason? Compare electricity bills over three months to see if that’s the case. If so, a dirty air filter might be the problem.

  1. White Sheet Test

Hang a white sheet 5 to 8 inches away from a vent for about an hour. The grayer the sheet becomes over this period, the dirtier the filter.

If all else fails, just take a look at the furnace filter. If it looks dirty, it is. Changing it a little early won’t hurt the HVAC system either. One method of remembering when the filter was last changed is to write the date on it when it is put in. This way there’s no guessing.


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