Geothermal Air Filters

Geothermal heating and cooling systems move conditioned air through your home just like conventional HVAC, except they rely on ground-source heat pump systems to exchange heat with the earth. Though the technology is different, they require regular air filter replacement to maintain efficiency and indoor air quality. All Filters carries SpiroPure geothermal air filters in 1-inch and 2-inch depths, available in MERV 8, MERV 11, and MERV 13 ratings across a wide range of sizes. Geothermal filters are sold in 6-packs to make scheduled replacement easy and affordable. Find your filter by nominal size, select your preferred MERV rating, and browse our full selection of furnace filters compatible with geothermal systems.

	MERV 8 Pleated Filters (12 Pack)	MERV 11 Pleated Filters (12 Pack)	MERV 13 Pleated Filters (12 Pack)	Odor Eliminator (Learn more)
Filter Life	3-4 months	3-4 months	3-4 months	3-4 months
MERV Rating	8	11	13	8
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MERV stands for Minimum Efficiency Reporting Values and is an industry-created standard that evaluates the efficiency of air filters. The MERV rating of any particular air filter ranges on a scale of 1 to 16, with a filter rating 1 being the least efficient and a filter rating 16 being the most efficient.
While it is important for the quality of the air in your environment to choose the most efficient filter possible, it is not always as simple as buying a filter with the highest MERV rating. Because the pores allowing for air flow in a highly-rated MERV filter are very small, the filter creates more resistance against air flow and may put too much pressure on the fan of your furnace, air conditioning, or air cleaner unit. It’s important to choose an air filter with the highest MERV rating that your particular unit will allow for maximum air flow. Information about specific MERV ratings and recommendations will generally be included with the documentation that came with your system.
We recommend choosing an air filter with a MERV rating between 8 and 11 for most residential units in order to adequately remove airborne contaminants. If your system can handle a filter with a higher MERV rating, you may wish to use a filter with a rating of 13 for even greater contaminant removal. However, it’s important to remember that filters with a higher MERV rating must be replaced at least every three months to avoid restricted air flow and negative effects on your system’s performance.

FAQs on Geothermal Air Filters

Can I clean my geothermal air filter instead of replacing it?

No. Geothermal air filters use pleated media that is not washable. Wetting or rinsing the filter disrupts the fiber structure and permanently reduces filtration efficiency. These are single-use replacements, which is an HVAC industry standard to ensure peak performance when replaced on schedule.

Where can I buy geothermal filter replacements?

Allfilters.com stocks SpiroPure geothermal replacement air filters in 1-inch and 2-inch depths across a wide range of nominal sizes. Filters are available in MERV 8, MERV 11, and MERV 13 and sold in 6-packs for convenient changes every 2–3 months or when filters are dirty.

What are geothermal air filters used for?

Geothermal air filters serve the same purpose as filters in conventional HVAC systems: they capture airborne particles like dust, pollen, pet dander, and mold spores before air circulates through your home. Keeping clean filters in place also protects the heat pump's components from particulate buildup that reduces efficiency and shortens equipment life.

How often should I replace my geothermal air filter?

Geothermal air filters typically need replacement every 3 months. Higher MERV ratings capture finer particles but may load faster, so MERV 11 and MERV 13 filters in homes with pets or allergy sufferers may need replacement sooner. Buying a 6-pack makes it easy to stay on schedule.

What MERV rating should I choose for my geothermal filter?

MERV 8 provides standard residential filtration and is appropriate for most homes without specific air quality concerns. MERV 11 adds meaningful allergen reduction and is a good choice for households with allergy sufferers or pets. MERV 13 offers among the highest level of residential filtration without specialized systems, but confirm your system supports it before upgrading.

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Geothermal Air Filters

MERV 8 Pleated Filters (12 Pack)

MERV 11 Pleated Filters (12 Pack)

MERV 13 Pleated Filters (12 Pack)

Odor Eliminator

Filter Life

3-4 months

3-4 months

3-4 months

3-4 months

MERV Rating

8

11

13

8

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12x30x1

14x20x1

14x24x1

14x30x1

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16x30x1

18x18x1

18x24x1

20x20x1

20x24x1

20x25x1

20x30x1

22x30x1

24x24x1

24x28x1

24x30x1

26x30x1

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30x32x1

12x20x2

16x20x2

18x18x2

18x20x2

18x24x2

18x32x2

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20x24x2

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24x30x2

27x30x2

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30x32x2

30x36x2

FAQs on Geothermal Air Filters

Can I clean my geothermal air filter instead of replacing it?

Where can I buy geothermal filter replacements?

What are geothermal air filters used for?

How often should I replace my geothermal air filter?

What MERV rating should I choose for my geothermal filter?

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MERV 8 Pleated Filters
(12 Pack)

MERV 11 Pleated Filters
(12 Pack)

MERV 13 Pleated Filters
(12 Pack)