How Often Should You Change Your Air Filter in Georgia?

Check your air filter once a month and change it when it looks dirty. For the 1-inch filters most Georgia homes use, that usually works out to every 1 to 3 months. Homes with pets, allergies, or construction dust may need a new one every month. Thicker 4- and 5-inch media filters often last 6 months or more.

ENERGY STAR recommends inspecting your filter monthly, because a dirty filter can raise energy costs and wear out your equipment early.

Why does the air filter matter so much?

Every bit of air your system heats or cools passes through the filter. When it clogs, your system has to work harder to pull air through. That can mean:

• Higher power or gas bills
• Rooms that don't heat or cool evenly
• A furnace that overheats and shuts itself off
• A heat pump or AC coil that freezes up
• More dust settling around the house

A filter costs a few dollars. Most of the repairs it helps prevent cost a lot more.

How often should I change it?

Use this as a starting point, then adjust based on what your filter looks like at each monthly check.

• Basic 1-inch filter, no pets: every 2 to 3 months
• 1-inch filter with pets: every month or two
• Allergies or asthma in the home: every month or two
• 4- or 5-inch media filter: about every 6 to 12 months, or as the manufacturer directs
• During remodeling or heavy pollen: check every couple of weeks

Georgia's spring pollen and long cooling season mean your system runs a lot of the year. If you only change your filter a couple of times a year, it's probably not often enough.

How do I know it's time?

Pull the filter out and hold it up to a light. If you can't see light through it, or it's gray with dust, replace it. Also watch for more dust on furniture, weaker airflow from the vents, or a system that runs longer than usual.

Where is my air filter?

Most homes have the filter in one of two places: in a slot at the furnace or air handler, or behind a return air grille in a wall or ceiling. Some homes have more than one return, each with its own filter. The size is printed on the edge of the old filter.

Which filter should I buy?

A higher MERV rating catches smaller particles, but it also restricts more air. Not every system can pull air through a very tight filter. If you want better filtration, ask a technician to check what your system can handle, or look at a whole-home air filtration system built for it.

When should I call a pro?

If your filters clog within a couple of weeks, your system may be pulling in dust through leaky ductwork, or the filter may be the wrong size. A technician can check your filter and airflow during a regular maintenance visit. Our Aero 360 Plan includes two scheduled visits a year. Call Aero Air Services at (888) 409-2376 or request service online.

Frequently asked questions

Can a dirty filter cause a burning smell?

It can contribute, since it makes parts run hotter. Read more in why your heater smells like burning.

Which way does the arrow on the filter go?

The arrow points toward the furnace or air handler, in the direction the air flows.

Can I wash and reuse my filter?

Only if it's labeled as washable. Most disposable filters can't be cleaned.