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Why Are We Different? How Often Should I Change My AC Filters? What Filter Should I Buy?
Since 1995, we have been manufacturing the highest quality pleated air filters at our facility in San Antonio, Texas, USA. The air you breathe is our priority. When you buy filters from us, you get the best product available made by people who really care about quality — and clean air! The answer to this depends on your unique situation. Here are some variables to consider: if you live in an extremely hot climate where your AC is constantly running, filters ought to be changed once a month. In moderately warm climates, you can stretch that to two months. If your AC sits idle half the time, then every three months could make sense.

Another important factor to consider is the level of airborne allergens in your area. Allergens can come in from the outside — think dirt, dust, mold, pollen — or they might already be in the home — think family pets, dust mites, roaches, mice, mold. Also, think about things that are not allergens, but that can trigger attacks — cigarette or cigar smoke, wood smoke, sawdust, chemical sprays, perfumes. If you have any of the situations noted above, consider a more frequent filter replacement cycle.
Each filter has a MERV (minimum efficiency reporting value) rating. Residential ratings run from a high of 13 to a low of 1. The higher the number, the better the filtration. We offer you High Performance Allergy (MERV 10), which is usually found in standard commercial buildings and better residences, and High Performance Allergy-Plus (MERV 13), which is used in superior residential and superior commercial buildings.
Why Are We Different?
Since 1995, we have been manufacturing the highest quality pleated air filters at our facility in San Antonio, Texas, USA. The air you breathe is our priority. When you buy filters from us, you get the best product available made by people who really care about quality — and clean air!
How Often Should I Change My AC Filters?
The answer to this depends on your unique situation. Here are some variables to consider: if you live in an extremely hot climate where your AC is constantly running, filters ought to be changed once a month. In moderately warm climates, you can stretch that to two months. If your AC sits idle half the time, then every three months could make sense.

Another important factor to consider is the level of airborne allergens in your area. Allergens can come in from the outside — think dirt, dust, mold, pollen — or they might already be in the home — think family pets, dust mites, roaches, mice, mold. Also, think about things that are not allergens, but that can trigger attacks — cigarette or cigar smoke, wood smoke, sawdust, chemical sprays, perfumes. If you have any of the situations noted above, consider a more frequent filter replacement cycle.
What Filter Should I Buy?
Each filter has a MERV (minimum efficiency reporting value) rating. Residential ratings run from a high of 13 to a low of 1. The higher the number, the better the filtration. We offer you High Performance Allergy (MERV 10), which is usually found in standard commercial buildings and better residences, and High Performance Allergy-Plus (MERV 13), which is used in superior residential and superior commercial buildings.
Our customers share the unfiltered truth about Filters4Air ...
We love Filters4Air and I hope you will check them out. I really like supporting local businesses and keeping my money here in San Antonio. - Jonathan D
Filters4Air is going above and beyond to get us a filter promptly. Their prices are very reasonable for the quality of the filter. - Elizabeth Y
I really enjoy the fact that the filters are waiting on my doorstep every filter cycle and I don't have to buy in bulk and figure out where to store them so they won't get damaged. - Trey C
I ordered today, assuming the filter would be here in several days from now. Much to my surprise, it was delivered a little while ago! Boy, talk about fast service!! - Gib J
Filters4Air makes changing my filters the easiest thing ever. I signed up and never had to think about it again. Thank you for doing such a great job and helping me simplify. - Andria A
The idea of a subscription filter service was new to me, but after a few hot summer months I realized I am a smart person -- thanks !!! - David M
Not only did I always forget to change my filters, I forgot the filter size. But after signing up with Filters4Air, I never have to think about it again. Thanks! - Aren M
Filters4Air News

How often should I change my air filters?

How often should I change my air filters?

The BIG question — How often should I change my air filters?

This is one of the most frequent questions we get here at filters4air.com.

I will give you a straight answer and a straight explanation.

You should change your air filters every 30 days. Period. End. Of. Story.

Here's why:

Let’s talk HVAC, which you probably already know is Heating, Ventilation, and Air Conditioning.

A central HVAC unit does not pull air in from the outside – it uses the air inside your house and either cools it down in summer or heats it up in winter. If it cools it down, hot air is vented to the outside world; if it heats your house up, it vents cold air to the outside. If your house was absolutely spotless and clean, you’d never need an air filter for your central HVAC unit.

Trust me, not a single healthy human being lives in an absolutely spotless and clean house.

Dust, dirt, pollen, dead bugs, hair, miscellaneous odors (many from questionable sources), smoke, chemical particles, dandruff, skin particles and a whole nasty horde of things float around your home no matter whether it is cold or hot outside. Add in pet dander and debris if you have pets.

Plus (because we all venture outside every day) we drag all of the above into the house on our clothes, hair, shoes and skin.

Each. And. Every. Day.

Yuck.

Plus, think about this —pollen and allergy season is not really seasonal in many locations — it lasts all year round if you live in Texas.

Texas is a great place to live, but everything has a downside. Texans get to deal with airborne allergens. Hey, it can't always be strawberries and cream.

Texans must endure nasty cedar pollen in the winter, plus an occasional and pesky high mold count. There is oak pollen in the Spring as the worst offender, but it gets serious help from elm, pecan, cottonwood and other culprits (grass among the many villains). Plus, due to moisture and heat, Texans get to live with mildew and its old pal mold. (SIGH). Ragweed arrives in late summer and early fall, aided and abetted by every sort of grass (yeah, more grass), plus every flowering plant that wants to survive by making pollen (BTW, that's almost all of them). Add in the harsh fact that Texans run the air-conditioning 24/7 in the late Spring thru Summer and into early fall. Why? Because it is blankety-blank hot in Texas! However, as all Texans can attest, it can also get surprisingly cold in the fall and winter, so you run the heat. Basically, the central heating (HVAC) system rarely gets a day off duty. Keep in mind that the dirty air inside your home that is processed by your cooling in the summer is also dirty air processed by your heating in the winter.

Solution – change your filter frequently and stop breathing that nasty, filthy, dirty air.

Nuff said.

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