A/C Filters 4 Less

What Type of Air Filter Should I Purchase?

Sept 26, 2025 By Bill Konves

Choosing the right air filter for your home or business can feel overwhelming with so many HVAC filter types available. As filter experts who've been helping customers choose the perfect filters since 2011, we get this question daily:

"What type of air filter should I purchase?"

The straightforward answer to that is, it depends. Choosing filter types depends on multiple factors, including health considerations, environmental factors, the specific characteristics of your HVAC system, and your budget, among other factors.

In our 15+ years helping customers choose filters, we've learned that the best filter is one that balances your air quality needs, system compatibility, and budget. With our USA-based expert support, we've guided thousands of customers through this decision, and we're here to help you with our air filter buying guide.

In this article, we will highlight the various types of air filters, their key features, use cases, and their pros and cons. This will help you make an informed decision on which air filter is the best fit for your HVAC system and budget.

TL;DR: Quick Filter Type Guide

Here's our expert air filter comparison based on 15+ years helping customers and working with HVAC companies:

🏠 Most Homes: Pleated filters (MERV 8) - Best balance of air quality, cost, and system compatibility

💰 Budget Option: Fiberglass filters - Lowest cost basic protection.

📏 Space-Constrained: Return grille filters - 5" performance in a 1" space

✂️ Custom Sizes: Orange & white media pads (MERV 8) - Cut to any size needed

🏢 Commercial Use: Aluminum frames with replaceable media - Long-term value

❓ Still Unsure? Text or call our USA-based experts at 954-588-7774 for free personalized advice

Understanding Different Air Filter Types

AC filter types are often classified based on the filtration medium, the type of materials used to make them, or their mode of filtration. Below is an AC and furnace filter guide for those used in most homes.

Fiberglass Air Filters: Budget-Friendly Basic Protection

As the name implies, the fiberglass air filters are made of several strands of layered fiberglass that provide a barrier against large particles such as dust and lint. These filters can be used in areas with no pets and minimal or no allergy concerns. It's also suitable for homes with minimal carpeting.

Most Fiberglass filters have low MERV ratings, typically ranging from 1 to 4. Merv ratings are indicators of a filter's capacity to trap particles. The higher the rating, the smaller the particle the filter can trap, and vice versa. Hence, Fiberglass filters will not be able to trap smaller particles, such as pollen or pet dander.

Pros:

Provides optimum protection for your HVAC system from large debris
Most affordable filter option available
Easy to replace - no special tools needed
Minimal airflow restriction (HVAC technicians love this feature)
Special custom sizes available for unique applications
Ideal for protecting equipment in dusty environments

Cons:

Because of its poor filtration, it hardly improves indoor air quality
Needs replacement every 30 days due to limited surface area
Not suitable for homes with pets or allergy sufferers
Limited thickness options - only available in 1" and 2" depths
Cannot capture smaller allergens like pollen, mold spores, or pet dander

Best for: Budget-conscious customers, rental properties, basic system protection

Polyester Air Filters: Enhanced Synthetic Performance

Polyester air filters are made of synthetic materials, featuring dual-layered high-performance media specifically designed for applications where synthetic filter media is preferred over fiberglass. Our Koch polyester filters offer the same durable construction as our fiberglass options, but with enhanced particle capture capabilities.

Polyester filters provide a step up from basic fiberglass filtration while remaining more affordable than pleated filters. The higher MERV rating enables them to capture a larger range of particles in the air, including dust, allergens, and some pet dander.

Pros

Better particle capture than fiberglass filters
Dual-layered high-performance media for enhanced filtration
More durable construction with synthetic materials
Environmentally friendly - no metal support needed
Moisture-resistant frame for added durability
Special custom sizes available for unique applications
Easy to install with a sturdy one-piece frame
Good balance of cost and performance

Cons

Limited thickness options - only available in 1" and 2" depths
Higher cost than basic fiberglass filters
Still cannot capture the smallest particles like pleated filters
May require more frequent replacement in high-dust environments
Not ideal for homes with severe allergies or multiple pets

Best for: Environmentally conscious homeowners, those wanting better filtration than fiberglass without pleated filter costs, commercial applications requiring synthetic media, customers seeking a middle-ground option

Pleated Air Filters: Most Popular Residential Choice

Pleated filters are made of synthetic fibers, such as polypropylene or folded polyester, which provide them with a large surface area to capture dirt and dust and hold them in place. Pleated filters are known to capture about 40% more particles than the average fiberglass filter.

With MERV ratings (8 - 13), pleated filters can conveniently trap smaller allergens like pet dander and mold spores, making them a suitable filter for households with mild allergies and those with moderate pet hair.

Pros

Multiple thickness options - Available in 1", 2", 4", and 6" depths (varies by model)
Excellent for capturing pollen, pet dander, dust mites, and mold spores
Low resistance to airflow - Reduces energy costs while maintaining efficiency
High dust holding capacity - Extended filter life up to three months
Sturdy double-wall frame design with moisture-resistant beverage board construction
Perfect for humid climates like Florida, where mold spores are common
Standard and high-capacity models are available for different applications
LEED points available with Green13 MERV 13 option
Mechanical media efficiency - Not dependent on electrostatic charge for consistent performance

Cons

A higher MERV rating (10-13) can restrict airflow in the home. Experts recommend MERV 8 for optimal performance, and it is the best air filter for home use.
Higher cost than fiberglass or polyester filters
May require more frequent changes in extremely dusty environments
Green13 MERV 13 only available in 1", 2", and 4" depths (no 6" option)

Best for: Most residential homes, customers with pets or mild to moderate allergies, Florida homeowners dealing with humidity and mold concerns, northern climates like Ohio, commercial applications requiring reliable filtration, environmentally conscious customers (Green13 earns LEED points)

Our Pleated Filter Options:

Multi-Pleat XL8 (MERV 8) - Our most popular residential option with low airflow resistance
Multi-Pleat XL10 (MERV 10) - Enhanced particle capture for better air quality
Multi-Pleat XL11 (MERV 11) - Dual-layered media with superior efficiency and low pressure drop
Multi-Pleat Green13 (MERV 13) - Highest efficiency option that earns LEED points

Return Grille Air Vent Filters (Practical Pleat)

In our experience serving customers nationwide, return grille filters have become increasingly popular, especially our Practical Pleat line. These innovative 5" high-performance filters are designed to fit directly into your standard 1" return air grille, providing superior filtration in a space-saving design that requires no retrofitting.

The Practical Pleat addresses a common issue: achieving high-efficiency filtration without requiring modifications to your HVAC system. With 433% greater surface area than comparable 1" extended surface pleats, these filters offer actual 5" filter performance in a 1" space.

Unique Patented Technology

The Practical Pleat is the only retrofitting filter with a unique self-sealing gasket that prevents air bypass. This patented gasket conforms to imperfections in the filter track, eliminating air bypass and preserving the integrity of the MERV 11 rating.

Pros:

Fits into standard 1" return grilles - no system modifications required
433% greater surface area than comparable 1" filters
Self-sealing gasket eliminates bypass air - patented technology
Up to 6 times longer effective lifetime than standard 1" pleats
Reduces energy consumption up to 86% compared to standard 1" MERV 11 filters
Custom sizes available up to 24"x60"
Reduces bacteria, mold, and mildew growth on coils
Extends HVAC equipment lifetime
Perfect for space-constrained installations

Cons:

Higher upfront cost than standard filters (offset by longer life and energy savings)
Requires proper measurement for a correct fit
Sold in cases of 2, but lasts for six months each.

Best for: Homes with space constraints, customers wanting high-efficiency filtration without system modifications, commercial buildings with standard return grilles, energy-conscious customers seeking long-term savings, and anyone wishing to eliminate filter bypass issues

Orange & White Media Pads

One of our most versatile products, orange and white media filter pads are especially valuable for custom-sized applications. At our Florida facility, we regularly assist customers who require exact-fit solutions for their unique HVAC systems.

These MERV 8 media pads can be cut to any desired size, making them ideal for custom applications where standard sizes are not suitable. The antimicrobial treatment is particularly beneficial in humid climates.

These are inserted into our custom-made aluminium air filter frames.

Pros:

Cut to any size needed - perfect for custom applications
High-efficiency MERV 8 filtration
Super tack antimicrobial treatment prevents mold and bacteria growth
Professional-grade polyester HVAC construction
Cost-effective for large or unusual sizes
Made in the USA with a quality guarantee

Cons:

Requires cutting to size (though we can do this for you)
Higher cost per square foot than standard filters
Need to purchase an air filter and a metal or plastic frame for a one-time up-front cost (but we also sell those).

Best for: Custom size applications, commercial HVAC systems with non-standard sizes, churches and large buildings with unique requirements, HOAs and property managers needing bulk custom solutions

Metal (Aluminum) Air Filter Frames

Our aluminum filter frames provide a durable, reusable solution that we often recommend for commercial applications or customers who prefer washable filter systems. These frames are particularly popular with our commercial clients.

We also offer the same type of filter in plastic; if you prefer this option, these come with a lifetime guarantee.

Pros:

Durable aluminum construction lasts for years
Reusable with washable media
Cost-effective long-term solution
Professional appearance
Environmentally friendly option
Can be used with various media types

Cons:

Higher upfront investment
Media replacement is needed periodically
Not suitable for all HVAC system sizes

Best for: Commercial applications, customers preferring washable solutions, environmentally conscious users, long-term cost savings

HEPA Filters

HEPA filters are particularly beneficial for individuals with severe allergies. They typically come with higher MERV ratings (13-16), which enables them to trap 99.97% of particles. It's essential to note that not all HVAC systems are compatible with HEPA filters. Additionally, in many cases, HEPA filters are used in conjunction with UV light filters to eliminate bacteria and viruses effectively. HEPA filters last between 2 and 3 years. Both HEPA filters and UV lights are significantly more expensive than most average filters available.

Media Filters

As the name implies, the material is composed of a medium inside a metal cabinet to capture particles, making it suitable for high-pollution areas or commercial properties. Like HEPA filters, they come in higher MERV ratings (13 - 16). They are highly efficient at trapping smaller particles and can be easily integrated into standard HVAC systems. However, media filters require installation by a professional and can last between 6 - 12 months.

Custom Size Filters

With over 15+ years of experience, we've found that many customers struggle to find the exact size they need. That's why we specialize in custom-sized filters made to your exact specifications.

Whether you have an older home with non-standard dimensions or a commercial building with unique requirements, our custom filters ensure a perfect fit every time.

Pros:

Made to your exact measurements (down to 1/8 inch)
Available in all filter types and MERV ratings
Perfect fit eliminates bypass air
Same quality construction as standard sizes
No compromise on filtration efficiency

Cons:

Longer lead time than standard sizes
Higher cost than standard dimensions
Requires accurate measurement

Best for: Older homes with non-standard sizes, commercial buildings, unique HVAC systems, customers who need exact fits

Summary: Filter Types and Use Cases

Based on our experience helping customers across all 48 mainland states, here are our recommendations:

For most homes, pleated filters (MERV 8) offer the best balance of air quality, cost, and system compatibility.
For budget-conscious customers, fiberglass filters provide basic protection at the lowest cost.
For space-constrained systems, return grille filters provide high-efficiency filtration without requiring system modifications.
For custom applications, orange and white media pads (MERV 8) can be cut to any size required.
For Unique Sizes: Custom filters ensure a perfect fit for non-standard dimensions. These can be made in any MERV rating.
For Commercial Use: Aluminum frames with replaceable media offer long-term value.

With all the information you now have at your fingertips, deciding on the type of filter to buy for your HVAC system should no longer be an issue. First, you need to understand your household's air quality requirements, as well as what works for your HVAC system, maintenance culture, and budget. We have a more detailed article on AC filter types.

Still Not Sure Which HVAC Filter Type is Right for You?

With our USA-based expert support, we're here to help you choose the perfect filter type. Call us at 954-588-7774 for free, personalized advice based on:

Your specific HVAC system requirements
Your air quality goals and health needs
Your budget and replacement schedule preferences
Your home's unique characteristics (size, pets, allergies)

No pressure, just expert guidance from people who care about your air quality.

USA-Based Expert Support - We answer the phone and provide real help, not automated responses. Call or text us, and you'll speak with one of our owners.

15+ Years of Experience - We've helped thousands of customers choose the right filters since 2011
Guaranteed Lowest Prices - If you find a lower price, we'll match it. We'll match it
Free Shipping on All Orders - No minimum purchase required
Family Owned & Operated - Personal service from people who care about your family's air quality

Serving customers nationwide with special expertise in Florida's unique climate needs. Family-owned and operated since 2011, helping churches, HOAs, high-rise buildings, and homeowners choose the perfect filters for healthier indoor air.