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Furnace & HVAC Filters

Furnace & HVAC Filters

Shop furnace and HVAC replacement filters for residential and light-commercial heating and cooling systems. Furnace Part Source carries standard and high-efficiency filters by size, MERV rating, and equipment model to help support airflow and indoor air quality.

Use the product list below to find the correct filter by dimensions, MERV rating, or equipment model. Always confirm filter size and airflow direction before ordering to help ensure proper fit and performance.

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    Lennox X0444 28x17x6 MERV 10 Media Filter

    Lennox

    MSRP: $63.26
    Now: $48.88
    28x17x6 MERV 10 Media Filter  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $63.26
    Now: $48.88
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    Lennox 75X73 Metal Mesh Insert Filter PCO12

    Lennox

    MSRP: $141.01
    Now: $108.96
    Metal Mesh Insert Filter PCO12   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $141.01
    Now: $108.96
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    MSRP: $141.01
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    Lennox 72H02 Pre-Filter

    Lennox

    MSRP: $83.72
    Now: $64.69
    Pre-Filter  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $83.72
    Now: $64.69
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    MSRP: $83.72
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    Lennox 69H85 PreFilter 16x13x1/4 Washable

    Lennox

    MSRP: $10.99
    Now: $8.49
    PreFilter 16x13x1/4 Washable  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $10.99
    Now: $8.49
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    MSRP: $10.99
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    Lennox 59436 20x25x1 Air Filter

    Lennox

    MSRP: $83.85
    Now: $64.80
    Lennox 59436  20x25x1 Air Filter   FurnacePartSource.com Commitment Always Brand-New Genuine Parts In stock parts ship Same Business Day when ordered by 5PM ET No
    MSRP: $83.85
    Now: $64.80
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    MSRP: $83.85
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    Lennox 48J01 Economizer Filter 16X25X1

    Lennox

    MSRP: $35.67
    Now: $27.57
    Economizer Filter 16X25X1   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $35.67
    Now: $27.57
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    Lennox 30336 Air Filter, 20x20x1

    Lennox

    MSRP: $157.16
    Now: $119.06
    Air Filter, 20x20x1   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $157.16
    Now: $119.06
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    MSRP: $157.16
    Now: $119.06
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    Lennox 30335 Air Filter

    Lennox

    MSRP: $103.47
    Now: $79.96
    Air Filter   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements    
    MSRP: $103.47
    Now: $79.96
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    MSRP: $103.47
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    Lennox 30334 Air Filter

    Tecumseh

    MSRP: $7.87
    Now: $6.08
    Air Filter  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $7.87
    Now: $6.08
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    MSRP: $7.87
    Now: $6.08
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    Carrier S4004T Refrigerant Oil Filter

    Carrier

    MSRP: $448.98
    Now: $346.94
    Refrigerant Oil Filter   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $448.98
    Now: $346.94
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    MSRP: $448.98
    Now: $346.94
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    Carrier S-4004UA Oil Filter

    Carrier

    MSRP: $403.10
    Now: $311.48
    Oil Filter   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $403.10
    Now: $311.48
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    MSRP: $403.10
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    Carrier P502-8417S Filter Drier 7/8"

    Carrier

    MSRP: $150.89
    Now: $116.60
    Filter Drier 7/8"   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $150.89
    Now: $116.60
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    MSRP: $150.89
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    Carrier P502-8415 5/8"SAE 41cu" Filter Drier

    Carrier

    MSRP: $171.12
    Now: $129.64
    5/8"SAE 41cu" Filter Drier   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $171.12
    Now: $129.64
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    MSRP: $171.12
    Now: $129.64
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    Carrier P502-8305S Filter Drier

    Carrier

    MSRP: $97.53
    Now: $73.89
    Filter Drier   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $97.53
    Now: $73.89
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    MSRP: $97.53
    Now: $73.89
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    Carrier L3-02206-4 Filter

    Carrier

    MSRP: $28.64
    Now: $21.70
    Filter   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $28.64
    Now: $21.70
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    MSRP: $28.64
    Now: $21.70
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    Carrier KH45LE120 Filter Drier

    Carrier

    MSRP: $386.63
    Now: $298.76
    Carrier KH45LE120 Filter Drier  Item is Non Cancelable / Non Returnable FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts -...
    MSRP: $386.63
    Now: $298.76
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    MSRP: $386.63
    Now: $298.76
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    Carrier KH45LD065 3/8" ODF Filter Drier

    Carrier

    MSRP: $78.14
    Now: $60.38
    3/8" ODF Filter Drier   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $78.14
    Now: $60.38
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    MSRP: $78.14
    Now: $60.38
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    Carrier KH43LG072 Puron Drier; R410A

    Carrier

    MSRP: $134.84
    Now: $104.19
    Puron Drier; R410A   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $134.84
    Now: $104.19
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    MSRP: $134.84
    Now: $104.19
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    Carrier KH42ME060 Filter Drier

    Carrier

    MSRP: $218.15
    Now: $168.57
    Carrier KH42ME060 Filter Drier Item is Non Cancelable / Non Returnable FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No...
    MSRP: $218.15
    Now: $168.57
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    MSRP: $218.15
    Now: $168.57
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    Carrier KH39MG002 Oil Filter Cartridge 3 Microns

    Carlyle

    MSRP: $562.48
    Now: $434.65
    Oil Filter Cartridge 3 Microns   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $562.48
    Now: $434.65
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    MSRP: $562.48
    Now: $434.65
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Furnace & HVAC Filters

Air filters remove dust, debris, and particulates from the air moving through a furnace or HVAC system, protecting internal components while supporting indoor air quality. A clogged or incorrectly sized filter can restrict airflow and reduce system efficiency.

Furnace Part Source carries a selection of furnace and HVAC filters in standard sizes and MERV ratings for residential and light-commercial equipment.

Common Filter Types We Carry

Common filter options include:

  • Standard pleated filters for everyday dust and debris capture.
  • Higher MERV-rated filters for improved filtration of finer particles.
  • Equipment-specific filters sized for particular furnace or air handler models.

How to Find the Right Filter

Before ordering, confirm the exact filter dimensions (length, width, and depth) either from the existing filter or the equipment's filter slot. Also check the recommended MERV rating for your system, since some HVAC equipment has airflow limitations that restrict how high a MERV rating can be used.

For best fit, compare:

  • Filter dimensions (length x width x depth)
  • MERV rating
  • Airflow direction arrow on the filter frame
  • Equipment model, if using an OEM-specific filter

Replacing Your Furnace or HVAC Filter

Regular filter replacement helps maintain airflow, protect the blower motor, and support consistent indoor air quality. Check filters monthly and replace them according to the manufacturer's recommended schedule or sooner if visibly dirty.

Need Help Choosing a Filter?

Not sure which filter size or MERV rating you need? Check the existing filter or the filter slot in your equipment, or contact Furnace Part Source for help identifying the correct replacement.

HVAC Filter FAQs

How often should I change my furnace filter?

Most furnace filters should be checked monthly and replaced every one to three months, depending on usage, filter type, and household conditions such as pets or allergies.

What does MERV rating mean?

MERV (Minimum Efficiency Reporting Value) measures how effectively a filter captures particles. Higher MERV ratings capture smaller particles but may increase airflow resistance, so confirm your system supports the rating you choose.

Can a dirty filter damage my furnace?

Yes. A clogged filter restricts airflow, which can cause the system to overheat, reduce efficiency, and place added strain on the blower motor and heat exchanger.

Which way does the airflow arrow on a filter go?

The airflow arrow should point in the direction air travels through the system, typically toward the blower or air handler. Installing a filter backward can reduce filtration efficiency.