Quick Answer: How do I know when to replace my furnace filter?

If your furniture gets dusty soon after housecleaning, the furnace filter could be clogged and is no longer effectively removing dust from the air. You may also notice that your furnace runs more than usual. Take a peek at the filter: If it’s gray and covered in dust and lint, it’s time to replace it.

How can I tell if my furnace filter needs changing?

The best test to know if a furnace filter is ready to be changed is to hold it up to a bright light . If you can still see light through the filter then air is still getting through the filter. If you suspect the filter is dirty enough to restrict the air flow, then change it out to a new filter.

How do I know when to change my air filter in my house?

Here are averages that may help you know how regularly you should get a new air filter at your residence:

  1. Vacation house or one occupant and no pets or allergies: every 6–12 months.
  2. Ordinary suburban home without pets: every 90 days.
  3. One dog or cat: every 60 days.
  4. More than one pet or if anyone has allergies: 20–45 days.
THIS IS INTERESTING:  Who makes Subaru brand oil filters?

What happens if you don’t change filter on furnace?

Short Cycling

If the air filter is not serviced often enough, it will eventually become clogged to the point that air cannot pass through it. When the furnace is operating, the lack of air flow will trap the heat in the system. … Without a new air filter, the furnace will overheat every time it starts up again.

How often should you change your furnace filter in winter?

Professionals, like our team at Airco Service, Inc. say that you should change your air filter at least every three months. During the winter, when you rely on your heating system more, you want to increase that frequency. During the winter, when the system is in constant use, change it out every month.

How do I know if my HVAC filter is dirty?

One clever way to determine if the air filter is dirty is to do the “white sheet test.” This involves hanging a clean white sheet approximately 5 inches away from one of the vents for at least one hour. If the sheet turns gray, you’ve got a filthy air filter. The grayer the sheet, the dirtier the filter.

How do you know if air filter is bad?

Poor Engine Performance

Engine misfires, rough idling and hard starts can all be traced to a clogged engine air filter. The dirty air filter restricts the air supply to the engine causing unburned fuel to form a soot residue that accumulates on the spark plug.

Is no air filter better than a dirty one?

Running your air conditioner without a filter is worse than running it with a dirty one. Instead, get to the store as soon as possible for a replacement or call an HVAC professional for replacement. Without a filter, your air conditioner is at risk for severe and expensive problems.

THIS IS INTERESTING:  Do you turn water off to change refrigerator filter?

Why are my air filters so dirty?

Ducts that have holes, gaps, or leaks should be sealed up properly to prevent good air from getting out and bad air from getting in. If there is a leak in the return air ducts, the dusty, dirty air from spaces like that attic or crawl space gets sucked up into the ducts, dirtying the air filter and causing clogging.

How much does it cost to replace a furnace filter?

Changing Your Furnace Filter

Costs for new filters range based on brand but tend to be around $10 to $30. The filter keeps dust and dirt from your furnace components and improves your air quality. Some annual inspections will include changing and cleaning this part of the unit.

Will furnace shut off if filter is dirty?

Running a Furnace With a Dirty Filter

A dirty furnace filter can cause some serious problems. Namely, it impedes air from flowing properly through your furnace, and can trigger it to shut down. This can result in a colder home.

How long do furnace filters last?

Change Your Filters Regularly

For example, a one inch furnace filter should be changed out every one to three months. A three to four-inch filter can last for six to nine months. If you have a thick five to six-inch filter, it can last from nine to twelve months.

Why does my furnace filter get dirty so fast?

When the thermostat’s fan setting is set to “ON” the indoor blower will run 24/7, constantly circulating air over the air filter. So now the filter is constantly catching airborne contaminants, causing it to quickly get dirty.

THIS IS INTERESTING:  What can you use to oil an air filter?

Can you change a furnace filter while its running?

You’ll need to turn off your furnace to change your home air filter. Make sure you turn the thermostat to the off position to prevent the unit from turning on while you change it. Power should be disconnected from your furnace system for maximum safety.

How often should a 4 furnace filter be changed?

1” furnace filters should be replaced every 1-3 months. 2” furnace filters should be replaced every 1-3 months. 4” furnace filters should be replaced every 6-9 months.