Best Furnace Filters for Allergies in 2025 – Best for Breathing Problems

For millions of allergy sufferers, the air inside their home can be a major source of discomfort. Dust mites, pollen, pet dander, mold spores, and other airborne allergens can circulate freely through your heating and cooling system, triggering sneezes, itchy eyes, and congestion. Fortunately, a key tool in combating these indoor allergens is your furnace filter.

Choosing the right furnace filter, specifically designed to capture the microscopic particles that cause allergies, can significantly improve your indoor air quality and provide much-needed relief. But with various sizes, materials, and efficiency ratings available, selecting the “best” filter can be confusing. This article will break down what matters most for allergy sufferers and review some popular filter options from your list to help you breathe easier in your home.

What to Look For When Buying Furnace Filters for Allergies

Selecting an effective furnace filter for allergy relief involves understanding how filters work and which features are most important for capturing allergens while maintaining the efficiency of your HVAC system.

1. MERV Rating: The Minimum Efficiency Reporting Value (MERV) is the most important rating to consider. It indicates how effectively a filter captures particles of different sizes. For allergy sufferers, a MERV rating of MERV 11 to MERV 13 is generally recommended.

These filters are efficient at trapping smaller particles like pollen, pet dander, dust mites, and mold spores. Higher MERV ratings (above 13) filter even more particles but can restrict airflow in some residential systems, potentially straining your furnace or air conditioner. Always check your HVAC system’s manual for the maximum recommended MERV rating.

2. Filter Type: The most common types are pleated filters. Pleated filters use a folded material (usually synthetic) to create a larger surface area for capturing particles. Electrostatic filters (either disposable or washable) use charged fibers or panels to attract and trap particles. Some filters combine these technologies. For allergies, look for high-quality pleated or electrostatic filters with an appropriate MERV rating.

3. Size: The filter size is critical for proper function and must match your furnace or air handler. Using the wrong size allows air (and allergens) to bypass the filter. Filter sizes are typically listed with three dimensions: width, height, and depth (e.g., 16x20x1 or 20x25x4). Always check the size on your existing filter or in your HVAC manual.

4. Filter Depth (Thickness): Filters come in various depths (1-inch, 2-inch, 4-inch, 5-inch, etc.). Thicker filters (4-inch or 5-inch) have more surface area and can last longer, potentially offering better filtration over time before becoming clogged. Ensure your system is designed to accommodate a thicker filter if you choose one.

5. Change Frequency: For allergy sufferers, it’s generally recommended to change filters more frequently than the standard 90 days, especially during peak allergy seasons or if you have pets. Check your filter monthly and replace it when it appears dirty, usually every 30-60 days for 1-inch filters and potentially every 3-6 months for thicker filters (4-inch+), depending on MERV rating and household conditions.

6. Material and Construction: Look for durable filter media that won’t easily tear and a sturdy frame (cardboard or plastic) that maintains its shape to prevent bypass.

Overall Best Pick: Filtrete 20x25x1 AC Furnace Air Filter

Rating: 8/10

Reason: Offers effective allergy filtration (MERV 11 equivalent), uses electrostatic technology, and is a common size from a trusted brand, balancing performance and compatibility for many homes.

Image	Name	Details	Price
	Simply MERV 8	16x20x1 (Size) Pleated electrostatic Up to 90 days (Lifespan)	Check Price
	Filterbuy MERV 8	20x25x2 (Size) Pleated synthetic media 2–3 months (Lifespan)	Check Price
	Filtrete MERV 11	20x25x1 (Size) Electrostatic Up to 3 months (Lifespan)	Check Price
	BNX TruFilter MERV 8	20x25x4 (Size) Hospital-grade pleated filter Up to 6 months (Lifespan)	Check Price
	Aerostar MERV 8	16x25x1 (Size) Pleated electrostatic 60–90 days (Lifespan)	Check Price
	AprilAire 213	OEM for AprilAire systems Genuine AprilAire pleated filter 6–12 months (Lifespan)	Check Price
	Nordic Pure MERV 12	20x25x4 (Size) Electrostatic pleated media Up to 6 months (Lifespan)	Check Price
	MervKing MERV 8	20x25x2 (Size) Pleated electrostatic Up to 90 days (Lifespan)	Check Price
	Frigidaire PureAir® MERV 8	20x25x1 (Size) Electrostatic pleated Up to 3 months (Lifespan)	Check Price
	Homequip Honeywell MERV 11	16x25x4 (Size) Replacement pleated filter 6–12 months (Lifespan)	Check Price

Top 10 Best Furnace Filters for Allergies in 2025:

1. Simply MERV 8 Air Filter ― Best Furnace Filter with MERV 11 (1-inch Size)

Rating: 7/10

Reason: A readily available 1-inch filter size with a suitable MERV 11 rating for capturing common allergens.

Features at a Glance: 

• Filter Size: 16x20x1
• MERV Rating: 8
• Filter Type: Pleated electrostatic
• Best For: Basic home dust, pollen, and debris filtration
• Lifespan: Up to 90 days

The Simply 16x20x1 Air Filter is a standard-sized pleated furnace filter with a MERV 11 rating. The 16x20x1 dimensions indicate its size, suitable for HVAC systems designed for this common 1-inch filter depth. The MERV 11 rating is effective for allergy sufferers, capable of capturing particles such as pollen, pet dander, dust mites, mold spores, and dust.

These are typically disposable pleated filters made from synthetic media. The pleated design increases the surface area, allowing the filter to capture more particles before needing replacement compared to basic fiberglass filters. Simply filters are generally positioned as an accessible and affordable option for regular filter changes.

This filter provides a good balance of filtration efficiency for allergies and airflow for many standard residential HVAC systems that use 1-inch filters. Regular replacement (likely every 30-60 days for allergy sufferers) is important to maintain efficiency and prevent airflow restriction as it captures contaminants.

2. Filterbuy MERV 8 Air Filter― Best Furnace Filter with MERV 8 (2-inch Depth)

Rating: 6.5/10

Reason: A 2-inch deep filter offering a step up in surface area from 1-inch, with a standard MERV 8 rating.

Features at a Glance: 

• Filter Size: 20x25x2
• MERV Rating: 8
• Filter Type: Pleated synthetic media
• Best For: Residential HVAC systems and allergen removal
• Lifespan: 2–3 months

The Filterbuy 20x25x2 Air Filter is a pleated furnace filter with dimensions of 20x25x2 inches, meaning it is 2 inches deep. This increased depth provides a larger surface area for capturing particles compared to standard 1-inch filters of the same face size (20×25), potentially allowing it to hold more contaminants before airflow is significantly impacted. The product name mentions “MERV,” but the specific MERV rating needs to be confirmed from the product listing.

Filterbuy commonly offers MERV 8, MERV 11, and MERV 13 options in this size. Assuming a MERV 8 rating based on the generic name, it is effective for capturing larger particles like lint, dust, and pollen, but less efficient for the smaller allergens like pet dander and dust mites compared to MERV 11 or 13. Filterbuy is a brand specializing in air filters, often sold in multi-packs and available directly online.

The 2-inch depth is compatible with HVAC systems designed for this size filter slot. This filter offers improved dust-holding capacity over 1-inch filters, which can be beneficial for system longevity and potentially extend the replacement interval slightly for general filtration, but a higher MERV rating would be needed for optimal allergy relief.

3. Filtrete MERV 11 Air Filter ― Best Furnace Filter with MERV 11 Equivalent (1-inch Size, Electrostatic Pleated)

Rating: 8/10

Reason: A widely available 1-inch filter from a leading brand, offering effective allergy capture with electrostatic properties.

Features at a Glance: 

• Filter Size: 20x25x1
• MERV Rating: MPR 1200 (approx. MERV 11)
• Filter Type: Electrostatic
• Best For: Capturing allergens, fine dust, and mold spores
• Lifespan: Up to 3 months

The Filtrete 20x25x1 AC Furnace Air Filter is a popular disposable pleated filter from 3M Filtrete, a well-known brand in air filtration. The size is a common 20x25x1 inch. While often marketed with a Microparticle Performance Rating (MPR).

The product name also clarifies it’s for “Allergen” capture and is “Electrostatic Pleated.” Filtrete’s “Allergen” filters typically correlate to a MERV 11 or 12 rating, effective for capturing pollen, pet dander, dust mite debris, mold spores, and microscopic allergens. The electrostatic property of the filter media helps attract and capture more particles than standard mechanical filters alone.

The pleated design provides ample surface area. These filters are widely available in retail stores. This filter is a go-to choice for many allergy sufferers using standard 1-inch filter slots due to its accessibility, reputable brand, and effective combination of pleated and electrostatic filtration for allergen capture. Regular replacement is needed to maintain optimal performance.

4. BNX TruFilter MERV 8― Best Furnace Filter with MERV 13 (4-inch Depth)

Rating: 8/10

Reason: Offers a high MERV 13 rating for superior allergen and fine particle capture in a longer-lasting 4-inch depth.

Features at a Glance: 

• Filter Size: 20x25x4
• MERV Rating: 13
• Filter Type: Hospital-grade pleated filter
• Best For: Allergies, bacteria, and virus carriers
• Lifespan: Up to 6 months

The BNX TruFilter 20x25x4 is a thick, 4-inch deep pleated furnace filter with a MERV 13 rating. The 20x25x4 dimensions mean it fits HVAC systems designed for 4-inch filters with a 20×25 face size. The MERV 13 rating is considered high-efficiency for residential systems, capable of capturing very small particles including bacteria, virus carriers, smoke, and smog, in addition to all common allergens like pollen, pet dander, and mold spores.

The 4-inch depth provides a significantly larger surface area compared to 1-inch or 2-inch filters, allowing it to capture and hold a much greater volume of particles before airflow is restricted. This typically translates to a longer lifespan, often requiring replacement only every 3-6 months.

BNX markets these as high-quality filters. This filter is an excellent choice for allergy sufferers or those concerned about fine particle pollution who have an HVAC system compatible with 4-inch filters. The MERV 13 rating offers superior air cleaning for a healthier indoor environment over an extended period.

5. Aerostar MERV 8 Air Filter― Best Furnace Filter with MERV 8 (1-inch Size, Value Pack)

Rating: 6.5/10

Reason: A budget-friendly 1-inch filter option with a standard MERV 8 rating, often available in value packs.

Features at a Glance: 

• Filter Size: 16x25x1
• MERV Rating: 11
• Filter Type: Pleated electrostatic
• Best For: Dust, pet dander, mold spores, and pollen
• Lifespan: 60–90 days

The Aerostar 16x25x1 Air Filter is a pleated furnace filter in the common 16x25x1 size. The specific MERV rating is mentioned as “MERV” but needs confirmation from the listing; Aerostar offers various MERV ratings in this size, including MERV 8. Assuming a MERV 8 rating, this filter is effective for basic filtration, capturing lint, dust, and pollen. It provides standard air filtration for protecting your HVAC system.

Aerostar filters are often sold in multi-packs, offering a cost-effective solution for regular filter replacement. The 1-inch depth fits standard filter slots in many residential HVAC systems.

While a MERV 8 rating provides some benefit for general air quality, it is less effective at capturing the smaller allergens like pet dander, dust mites, and mold spores that MERV 11 or 13 filters are designed for. This filter is a good choice for basic system protection and dust control at a budget price but may not be sufficient for significant allergy relief.

6. AprilAire 213― Best Furnace Filter (Media) for AprilAire Systems (MERV 13)

Rating: 8.5/10

Reason: A high-efficiency MERV 13 media filter specifically designed for AprilAire whole-house air purifiers, offering superior allergy capture in compatible systems.

Features at a Glance:

• Filter Size: OEM for AprilAire systems
• MERV Rating: 13
• Filter Type: Genuine AprilAire pleated filter
• Best For: Whole-house allergen & asthma relief
• Lifespan: 6–12 months

The AprilAire 213 Replacement Filter is a thick, high-capacity media filter specifically designed for use in AprilAire’s whole-house air purifier systems (such as models 1210, 1620, 2210, 2216, 3210, 4200, etc., or older models with an upgrade kit). It is a MERV 13 rated filter, providing excellent filtration efficiency for capturing a wide range of particles, including common allergens, bacteria, and potentially some virus carriers.

These are typically 4-inch or 6-inch deep filters (the “213” model number denotes a specific size, often around 20x25x4 or similar media filter dimensions depending on the AprilAire unit).

AprilAire systems are designed to handle the higher airflow resistance of MERV 13 filters. The media filter design offers a very large surface area, allowing for long filter life (often 6-12 months) and high dust-holding capacity.

This filter is an excellent choice for allergy sufferers who have a compatible AprilAire whole-house air purification system, providing superior, long-lasting filtration specifically engineered to work with their unit for optimal air quality.

7. Nordic Pure MERV 12― Best Furnace Filter with MERV 12 (4-inch Depth)

Rating: 7.5/10

Reason: A 4-inch deep filter offering a good balance of high particle capture (MERV 12) and extended life.

Features at a Glance:

• Filter Size: 20x25x4
• MERV Rating: 12
• Filter Type: Electrostatic pleated media
• Best For: High-efficiency residential air systems
• Lifespan: Up to 6 months

The Nordic Pure 20x25x4 is a thick, 4-inch deep pleated furnace filter from the brand Nordic Pure. The 20x25x4 dimensions fit HVAC systems designed for this size filter. The product name implies a specific MERV rating, and Nordic Pure commonly offers MERV 10, MERV 12, and MERV 14 in this size.

Assuming a MERV 12 rating (as indicated in search results for this specific product name pattern), this filter is highly effective for capturing a broad range of allergens, including pollen, pet dander, dust mites, mold spores, and smaller particles like dust and smog.

The 4-inch depth provides a substantial surface area, allowing the filter to capture a significant amount of contaminants and typically last longer than 1-inch or 2-inch filters, often requiring replacement every 3-6 months. Nordic Pure is a recognized brand in the air filter market, offering various sizes and MERV ratings.

This filter provides excellent filtration for allergy sufferers with HVAC systems compatible with 4-inch filters, offering a good balance of high efficiency and extended replacement intervals. Some user reviews mention potential slight variations in actual dimensions, so confirming the exact size needed for your system is important.

8. MervKing MERV 8 Air Filter ― Best Furnace Filter with MERV 11 (2-inch Depth, Value Option)

Rating: 7/10

Reason: Provides a MERV 11 rating effective for allergies in a 2-inch depth, likely offering good value in this size category.

Features at a Glance:

• Filter Size: 20x25x2
• MERV Rating: 11
• Filter Type: Pleated electrostatic
• Best For: Trapping pollen, dust mites, and pet dander
• Lifespan: Up to 90 days

The MervKing 20x25x2 Air Filter is a pleated furnace filter with dimensions of 20x25x2 inches (2 inches deep). The product name indicates a MERV rating, and based on searches for this product pattern, it is likely MERV 11. A MERV 11 rating is well-suited for allergy sufferers, capturing common allergens like pollen, pet dander, dust mites, and mold spores, as well as dust and lint.

The 2-inch depth offers a larger surface area than 1-inch filters, allowing it to hold more contaminants and potentially last longer before affecting airflow. MervKing appears to position itself as a provider of filters across various MERV ratings and sizes.

This filter provides effective allergy filtration in a 2-inch depth, which is a good option for HVAC systems compatible with this size and offers a step up in dust-holding capacity from 1-inch MERV 11 filters. It is likely a competitive option in terms of price for a MERV 11 in a 2-inch size.

9. Frigidaire PureAir® MERV 8 ― Best Furnace Filter with MERV 8 (1-inch, Electrostatic)

Rating: 7/10

Reason: A widely available 1-inch filter from a known appliance brand, offering MERV 8 filtration with electrostatic properties for basic allergen capture.

Features at a Glance:

• Filter Size: 20x25x1
• MERV Rating: 8
• Filter Type: Electrostatic pleated
• Best For: Everyday household allergen reduction
• Lifespan: Up to 3 months

The Frigidaire PureAir® 20x25x1 filter is a disposable pleated filter from Frigidaire, a brand recognized for home appliances. It comes in the common 20x25x1 size and has a MERV 8 rating. The name specifies “Allergen Electrostatic Pleated,” indicating it’s designed with allergy capture in mind and utilizes electrostatic properties in addition to the pleated media.

A MERV 8 rating is effective for capturing larger particles like lint, dust, and pollen. While it’s marketed for allergens and includes electrostatic features, MERV 8 is less efficient at trapping smaller allergens (pet dander, dust mites, mold spores) compared to MERV 11 or 13 filters.

The electrostatic charge helps attract more particles than a basic MERV 8 pleated filter. This filter is a convenient option for users of Frigidaire appliances or those seeking an easily accessible filter in the standard 1-inch size.

It provides improved filtration over basic fiberglass filters and some benefit for larger allergens due to the electrostatic properties, but higher MERV options are generally better for comprehensive allergy relief.

10. HOMEQUIP Honeywell MERV 8 Furnace Filters― Best Furnace Filter with MERV 11 (4-inch Depth, from a Leading Brand)

Rating: 8/10

Reason: A high-capacity 4-inch deep filter with a MERV 11 rating from a leading HVAC brand, offering effective allergy capture and extended life in compatible systems.

Features at a Glance:

• Filter Size: 16x25x4
• MERV Rating: 11
• Filter Type: Replacement pleated filter
• Best For: Compatible Honeywell whole-house systems
• Lifespan: 6–12 months

The Honeywell 16x25x4 Furnace Filter (model FC100A1029) is a thick, 4-inch deep filter from Honeywell, a major and trusted brand in home comfort and HVAC systems.

The 16x25x4 dimensions fit HVAC systems designed for this size media filter. Based on the model number and common Honeywell filters, this is likely a MERV 11 rated filter.

A MERV 11 rating is highly recommended for allergy sufferers, effectively capturing common allergens like pollen, pet dander, dust mites, and mold spores. The 4-inch depth provides a very large surface area for particle capture, leading to a significantly longer filter life compared to 1-inch filters (often 3-6 months or more, depending on usage and household conditions) and reducing the frequency of replacements.

Honeywell filters are known for their quality and compatibility with Honeywell HVAC systems, though they can often be used in other compatible systems. This filter is an excellent choice for allergy sufferers with HVAC systems that accept 4-inch filters, providing effective and long-lasting allergen filtration from a leading brand in the industry.

Choosing the Right Furnace Filter for You: A Complete Buying Guide

Choosing the right furnace filter is a critical decision that impacts the air quality in your home and the efficiency of your HVAC system. For allergy sufferers, selecting the appropriate filter is even more important.

1. Prioritize MERV Rating for Allergen Capture: The MERV rating is the primary indicator of a filter’s ability to capture small particles like allergens. Higher MERV means better filtration, but too high can restrict airflow. For effective allergy relief, aim for filters with a MERV 11 or MERV 13 rating, ensuring your HVAC system is compatible.

We recommend Simply 16x20x1 (MERV 11), Filtrete 20x25x1 (MERV 11 equiv.), BNX TruFilter 20x25x4 (MERV 13), AprilAire 213 (MERV 13), Nordic Pure 20x25x4 (MERV 12), MervKing 20x25x2 (MERV 11), and Honeywell 16x25x4 (MERV 11). MERV 8 filters offer basic capture but are less effective for smaller allergens.

2. Select the Correct Size and Depth for Your System: The filter’s dimensions must exactly match your furnace or air handler’s filter slot for proper filtration and airflow. Thicker filters (4-inch+) offer longer life and more surface area. Always check your existing filter or HVAC manual for the correct size (e.g., 16x20x1, 20x25x2, 20x25x4, 16x25x4).

If your system accepts a deeper filter, consider 4-inch+ options like BNX TruFilter 20x25x4, AprilAire 213, Nordic Pure 20x25x4, or Honeywell 16x25x4 for longer life. For standard 1-inch slots, options like Simply 16x20x1, Filtrete 20x25x1, Aerostar 16x25x1, or Frigidaire PureAir 20x25x1 are suitable but require more frequent changes.

3. Choose a Filter Type Based on Preferences and System Compatibility: Most allergy filters are pleated, but some have added electrostatic properties. Pleated filters are common and effective. Filters with Electrostatic properties (e.g., Filtrete 20x25x1, Frigidaire PureAir 20x25x1) can offer enhanced particle attraction. Ensure any filter type is compatible with your specific HVAC system requirements.

4. Understand the Importance of Regular Replacement: A clogged filter, even a high-MERV one, restricts airflow and reduces filtration efficiency, negatively impacting both air quality and HVAC performance. For allergy relief, check your filter monthly and plan to replace 1-inch filters every 30-60 days. Thicker filters (4-inch+) may last 3-6 months or longer, but visual inspection is key; replace when visibly dirty.

5. Consider Your HVAC System’s Capabilities: Not all HVAC systems can handle the increased airflow resistance of very high MERV filters (above 13). Using too restrictive a filter can damage your system. Always consult your HVAC system’s manual or a qualified technician for the maximum recommended MERV rating and filter size.

Generally, MERV 11 or 13 is safe for most modern residential systems, but confirm compatibility. By carefully considering these factors and referencing the types and specifications of the filters on your list, you can select the best furnace filter to effectively reduce allergens in your home and help you breathe easier.

FAQ

What does MERV stand for?

A: MERV stands for Minimum Efficiency Reporting Value. It is a standard rating system used to measure the effectiveness of air filters in capturing airborne particles. The scale ranges from 1 to 20, with higher numbers indicating greater efficiency at trapping smaller particles.

Why is a higher MERV rating better for allergies?

A: Higher MERV ratings (like MERV 11 or 13) indicate the filter is better at capturing smaller particles, which include common allergens such as pet dander, dust mite debris, mold spores, and fine pollen that can easily pass through lower MERV filters.

Can I use a MERV 13 filter in any furnace?

A: Not necessarily. While MERV 13 filters offer excellent filtration, their denser material can create more resistance to airflow. Older or less powerful HVAC systems may not be designed to handle this restriction, potentially leading to reduced efficiency, increased energy costs, or even damage to the system’s fan or motor. Always check your furnace or air handler manual for the maximum recommended MERV rating.

How often should I change my furnace filter if I have allergies?

A: For allergy sufferers, it’s generally recommended to check your filter monthly and replace 1-inch filters every 30-60 days. Thicker filters (4-inch+) may last longer (3-6 months), but replacement frequency depends on household conditions, the number of pets, and the severity of allergies. Replace the filter when it appears visibly dirty.

What is the difference between nominal size and actual size?

A: The nominal size (e.g., 16x20x1, 20x25x4) is the rounded-up, easy-to-remember size printed on the filter. The actual size is the filter’s precise measurement, which is usually slightly smaller than the nominal size to ensure it fits easily into the filter slot. When replacing a filter, always match the nominal size printed on the old filter and confirm it matches the requirements of your HVAC system.

Conclusion

Investing in the right furnace filter is a simple yet powerful step in creating a healthier indoor environment, especially for those affected by allergies. By focusing on an appropriate MERV rating (typically MERV 11 or 13), selecting the correct size and depth for your HVAC system, understanding the benefits of different filter types, and committing to regular replacement, you can significantly reduce the circulation of allergens in your home.

Don’t let airborne particles compromise your comfort; choose a filter from options like those reviewed to help you and your family breathe cleaner, sneeze less, and enjoy your home more fully.