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Filters Help Keep Your Indoor Air Clean

The quality of your indoor air depends on simple maintenance of your home filters. You can also add powerful air cleaners to your system to filter out even more harmful pollutants.

What are HVAC filters and why do I need them?

Filters are an important part of your total home heating and cooling system. They play the crucial role of filtering out harmful particles like dust, pollen, pet dander and more so they don't circulate throughout your home. Filters also keep your system's internal parts clean from debris and build up so it runs more efficiently and lasts longer.

Where to find your HVAC filters?

Return vents. Most homeowners are familiar with return vents. Many homes have several placed either on a wall or ceiling. Return vents help keep the air pressure consistent in your home and trap many particles so they don't circulate or enter into the HVAC system. The air filter is located directly behind the gate. It is common to change the air filter out from these every 90 days.

Your air conditioner or furnace will also have an air filter closer to the indoor mechanical system. Usually the air filter is near a return air duct or blower compartment. It may be tricky to find in some systems but here's a good place to start.

  • Horizontal HVAC units: The filter usually fits in a slot on the air return side of the unit.
  • Vertical HVAC units: The filter typically slides into a slot above or below the HVAC unit.
  • Other HVAC systems: For any other kind of system, look for the air filter behind the return air grill on the wall, ceiling or utility closet door.

Check out our user manuals or contact a Trane Comfort Specialist™ if you have any questions about where your air filter is located.

How often to change your HVAC air filter

Typically, you'll want to change your filter every 90 days for the best air quality and efficiency. Timing may differ depending on the type of filter and whether it's attached to an air conditioner or furnace.

How to change HVAC air filters

Locate all the filters in your home along with size. Most filters will include sizing information around the edge of the frame. Measure for length, width and thickness if the size isn't indicated and select your new filters. Be sure to place the filter correctly. Most have color or arrows to mark the front and back (upstream and downstream flow).

Types of filters

Trane offers several types of filters. Each one helps to filter out harmful particles but the size particle and effectiveness of each differs.

  • Trane Performance Filter

    Comfort Performance filter

    Standard air filter that fits all Trane and other HVAC systems.

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    Available at and from Trane Dealers in select locations.

  • Slim Fit Product

    SlimFit Filter Rack

    The SlimFit Filter Rack comes in made-to-fit sizes for the TEM Air Handlers and the S-Series furnace.

  • Quikboox Media Cabinet

    QuikBox Media Cabinet

    The Quikbox filter can last up to 6 months and is easily replaceable by you or your installer.

  • Clean Effects Products

    CleanEffects Air Cleaner

    Trane's air cleaner removes up to 99.98% of airborne particles - including those as small as .1 micron.

    Removes up to 99.9% influenza A virus.

    Source: As reported by airmid health group ltd. in ASR document ASCR092142 (2015)

Why Air Filters Are Important

Our top air filter, the Trane CleanEffects air cleaner, limits these harmful particles:

  • Pollen
  • Bacteria
  • Tobacco Smoke
  • Hair
  • Dust
  • Mist
  • Skin lakes
  • Pet Dander
  • Mold
  • Cooking smoke

Air Filter Maintenance

Most air filters should be replaced every 90 days. But depending on the type of air filter you have and whether it's attached to an air conditioner or furnace, the timing may be different.

Check out our Maintenance Tips page for more details on air filter maintenance and other HVAC systems.

Indoor Air Quality

See how common household air purifiers & filters stack up

Clean Air Delivery Rate (CADR) measures the effectiveness of air cleaning appliances. The higher the clean air delivery rate, the more effective the unit is at cleaning the room or home of airborne particles and allergens.
in room appliance 10 CADR In-room
1 inch filter 12 CADR 1-inch
HEPA appliance 150 CADR HEPA
whole house media filter 240 CADR Whole-house
5-inch media filter
1 inch filter 660 CADR Whole-house
Electronic Air Cleaner
clean effects image 1,200 CADR Trane
Up to 100X more effective than standard 1 inch
* Based on 3rd party testing of particle removal efficiency down to 0.3 microns (2005)
Swipe to compare

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