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How Often Should You Change Your Air Filter?

For a standard one inch filter, change it every one to three months. Every month if you have pets, allergies, or run the system hard. Because the cooling season here runs long, checking monthly and replacing when it looks grey rather than white is a better habit than following a fixed schedule.

How to actually tell

Pull it out and hold it up to a light. If light passes through easily, it has life left. If it is grey and the light barely comes through, it is done. That takes ten seconds and beats any calendar.

What changes the timing

  • Pets. One shedding animal roughly halves filter life. Two or more, check monthly without fail.
  • Thicker filters last longer. A four or five inch media filter often runs six months to a year. A one inch filter does not.
  • Dirt roads and pollen. Plenty of our customers are on unpaved roads, and spring pollen here is heavy. Both load a filter fast.
  • Running hours. July and August load a filter far quicker than April does.

Which filter to buy

Filters are rated by MERV, which measures how fine a particle they catch. Higher is not automatically better.

  • MERV 8 to 11 suits most homes. Good filtration, and airflow your system can handle.
  • MERV 13 and up catches finer particles but restricts airflow more. On residential equipment not designed for it, this can cause the exact freezing problem covered in our piece on why an AC freezes up.

Unless someone in the house has a specific respiratory need, a good MERV 8 to 11 changed on time beats a MERV 13 left in too long.

Check the arrow. Every filter has an airflow direction arrow printed on the frame. It points toward the blower, in the direction air travels. Installed backwards, the filter cannot hold its shape properly and works poorly.

What a clogged filter really costs

It is the cheapest part of the system and the one most likely to cause an expensive problem. A blocked filter starves the coil of airflow, which makes it freeze, which risks the compressor. It also forces the blower to work harder, raising your power bill. A large share of the no-cool calls we run in July trace back to a filter nobody had checked since spring.

Common Questions

Quick answers.

How often should I change my HVAC filter in Georgia?

Every one to three months for a standard one inch filter, and monthly if you have pets, allergies, or live on a dirt road. Because the cooling season here is long, the practical approach is to check it monthly and change it when light no longer passes through easily.

Is a higher MERV rating always better?

No. Higher MERV catches finer particles but restricts airflow. Most residential systems are designed around MERV 8 to 11. Fitting a much higher rating can reduce airflow enough to freeze the coil, which causes more problems than the extra filtration solves.

What happens if I do not change my air filter?

Airflow across the evaporator coil drops, which can cause the coil to freeze and, if it continues, damage the compressor. The blower also works harder, increasing energy use. A neglected filter is a common cause of summer breakdowns.

Need it looked at?

We answer 24/7, weekends and holidays included. diagnostic, waived if you go ahead with the repair.

Call 478-237-7655

Where We Work

Serving Southeast Georgia.