Cyber Monday Sale On Now!

We only do it once a year, for a limited time get an extra 15% off your filter order and FREE SHIPPING! No promo code needed, just add your filters to the cart and checkout.

ONCE A YEAR SALE ON NOW

Shop Furnace and Air Conditioning Filters Online

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 15+ years and is a preferred online retailer for AAF Flanders Furnace and AC Filters. We sell filters by the case or individual filters with our subscription program.

Top Rated Filters

Quality Air 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 air conditioning 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 air conditioning 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.

Our Filters

How to Change Your Air / Furnace Filter

Recent Blog Posts

View all
Signs Your Home Has a High Indoor Humidity Level

Signs Your Home Has a High Indoor Humidity Level

Creating the ideal home takes careful planning, so why should you let its air quality suffer? These are signs your home has a high indoor humidity level.
Signs It’s Time for a Residential Duct Cleaning

Signs It’s Time for a Residential Duct Cleaning

Checking your air ducts and the furnace filter is a routine need for maintaining your home. These are signs it’s time for a residential duct cleaning.
Things To Consider When Purchasing Your First Air Filter

Things To Consider When Purchasing Your First Air Filter

Changing your air filter is a critical component of maintaining your HVAC system. These are things to consider when purchasing your first air filter.