Shop Furnace and AC Filters - Trusted in Filtration Since 2006

Over a million filters sold and replaced. That’s billions of particles removed from indoor air. Trust your air to us. RTF has been in business for 14+ years and is a preferred online retailer for AAF Flanders Furnace and AC Filters

Quality Furnace and AC Filters Online

What’s your need? Commercial? Residential? Industrial? HEPA? We have you covered! At RememberTheFilter.com, you’ll find the perfect HVAC filter online for your system. Our stock features leading manufacturers!

Buying furnace and AC filters online at RememberTheFilter.com is easy, convenient, and saves you time and money. No high-pressure sales. No time-consuming service appointments. No searching for weeks or months for your filter size. Just friendly, knowledgeable filter experts dedicated to helping you select the right filters for your system.

With thousands of sizes to choose from, you’ll never have to search for your filter again! You can even buy custom furnace and AC filters online! We’ll send you perfect fit filters for your HVAC system. We deliver filters to you for free, too! Whether you live here with us in the Pacific Northwest, or you’re in Texas, Chicago, New York, Los Angeles, or Florida, we deliver for free anywhere in the entire contiguous United States – even oversized or special order filters.

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How to Replace Your Air Conditioner Filter

How to Replace Your Air Conditioner Filter

Replacing your home unit's air filter is one of the most important pieces of maintenance you can do. Find out how to replace your air conditioner filter ahead.
An air filter laid out carefully on a wooden floor.

Factors That Affect Indoor Air Quality

Air quality is one of the most important aspects of your home that you need to pay attention to. Poor air quality can not only be uncomfortable to ...
What Happens If You Don’t Use an Air Filter In Your AC Unit

What Happens If You Don’t Use an Air Filter In Your AC Unit

You might not understand the importance of having an air filter in your AC unit. Here's what happens if you don’t use an air filter in your AC unit.