Exact Filters

28x28x1 Geothermal Compatible HVAC Exact Fit Filters – MERV 13 (12 pack)

$ 567.99
$ 567.99
Shipping calculated at checkout.

Made in the Exact Size!

Exact Filters are made to order to ensure a perfect fit for your HVAC system. These filters will have the final dimensions of 27 3/4 x 27 3/4 x 3/4 inches. Say goodbye to air bypass and the hassle of searching for a filter that matches your system. Backed by the Filter Fit Guarantee, you can trust that your Exact Filters will provide optimal performance.

Our Geothermal Compatible HVAC Filters – MERV 13 are engineered for geothermal heat pump systems and high-efficiency HVAC equipment that require maximum particle capture with precise airflow control. Designed to meet the tighter tolerances common in geothermal applications from leading manufacturers such as Carrier, ClimateMaster, and WaterFurnace, these filters deliver advanced filtration without compromising system performance when properly specified.

Manufactured to exact dimensions, these filters are not undersized or rounded to nominal measurements. For example, a 28x28x1 filter is produced at an actual size of 27-3/4” x 27-3/4” x 3/4”, ensuring a snug fit that minimizes air bypass—especially important for geothermal systems that operate longer and more consistently than traditional HVAC equipment

With a MERV 13 rating, these filters capture smaller airborne particles including fine dust, pollen, mold spores, pet dander, and other microscopic contaminants. This level of filtration is well-suited for geothermal systems designed to support higher-efficiency media while maintaining controlled airflow and system protection.

Designed for Geothermal & High-Efficiency Systems

Compatible with many systems including:

  • Geothermal heat pump systems
  • Water-source heat pumps
  • High-efficiency residential HVAC systems
  • Light commercial HVAC applications
  • Forced-air heating and cooling systems designed for higher MERV filtration
  • Common geothermal platforms from Carrier, ClimateMaster, and WaterFurnace

Key Features & Benefits

  • Exact Fit Manufacturing – Built to precise dimensions for improved sealing and reduced air bypass
  • MERV 13 Filtration – Higher-efficiency particle capture for advanced system protection
  • Optimized Pleated Media – Designed to balance filtration efficiency and airflow resistance
  • Rigid, Durable Frame – Maintains shape under operating pressure and extended run times
  • Ideal for Continuous Operation – Supports the longer duty cycles typical of geothermal HVAC systems

These geothermal compatible MERV 13 HVAC filters are an excellent choice for systems designed to handle higher-efficiency filtration, including many Carrier, ClimateMaster, and WaterFurnace geothermal units where exact sizing and airflow control are critical.

Note: MERV 13 filters offer increased filtration efficiency and should be used only in systems designed to accommodate higher-resistance media. Always confirm your system’s airflow requirements and exact filter dimensions before ordering.

Specifications

Nominal Size

28 x 28 x 1 inches

Actual Size

27 3/4 x 27 3/4 x 3/4 inches

MERV Rating

MERV 13

Filter Media

100% synthetic non-woven, proprietary media that can be recycled. Engineered with a gradient density composition that achieves it's MERV rating using the mechanical method of particle capture. Media does not rely on an electrostatic charge to capture particulate, since electrostatic charged filters dissipate over time.

Filter Support Grid

Expanded metal is continuously laminated on the air leaving side to provide pleat stability during operation. Pleat shape is maintained allowing full media utilization which improves dust holding capacity.

Frame

Heavy-duty, two piece, moisture-resistant frame with diagonal support members. Frame is bonded to the media at all points of contact for unsurpassed frame strength. Interlocking corners and positive media-to-frame seal reduce the possibility of air bypass.

Removes

MERV 13 rating reduces up to 95% of airborne particles including dust and lint, dust mite debris, pollen, pet dander, mold spores, bacteria, microscopic allergens, virus carriers, most smoke, smog, oil smoke, as well as lead dust. Hospital-grade air filtration provides maximum protection for your home or business.

Life

Recommended 90 day changeout

Quantity

12 Filters

Part Number

MERV 13 - 27 3/4 x 27 3/4 x 1
28x28x1 Geothermal Compatible HVAC Exact Fit Filters – MERV 13 (12 pack)

$ 567.99

Quick Facts
28x28x1 Geothermal Compatible HVAC Exact Fit Filters – MERV 13 (12 pack)

  • 28 x 28 x 1 inches

  • Filter Fit Guarantee

  • MERV 13

  • Free Shipping

Give us a call

We are happy to help over the phone at 1.866.469.8556, Monday-Friday (Pacific Time)

Free Shipping

When you spend $50+ in the domestic U.S. We offer great rates to Hawaii, Alaska and Canada.

U.S. Based Support

Support from real humans based in the United States.

General

How often should I replace my HVAC filter?

Most pleated filters should be changed every 90 days. However, households with pets, allergies, or heavy HVAC use may need to replace filters every 30–60 days. Commercial and industrial sites may require more frequent changes based on conditions.

Do you offer custom sizes?

Yes! If you need a filter with an exact size—down to the 1/8 inch—we can help. Visit our Custom Size Filters page to get started.

What if the filter doesn’t fit right?

We’ve got you covered with our Filter Fit Guarantee. If the size doesn’t fit your system as expected, reach out to our support team and we’ll make it right.
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What makes you different from big box stores or other filter sites?

We’ve been online for nearly 20 years, and our team has over 50 years of combined HVAC experience. We sell American-made filters from trusted brands like AAF Flanders and Koch Filter—no cheap knockoffs or low-performance imports. We’re also a proud NAFA member, which means we’re committed to real air quality expertise and professional standards.

Do you sell the same filters used in commercial or government buildings?

Yes. In fact, we supply filters to schools, clinics, and government agencies nationwide. Many of our filters—especially MERV 10, 11, and 13—meet or exceed specifications for professional use. You’re getting professional-grade protection for your home.

Are your filters certified or tested?

Yes. Almost all of our filters meet or exceed ASHRAE standards and are manufactured under strict quality control. Many are used in hospitals, schools, and government facilities—so you can trust they perform as advertised.

How do I know what size filter I need?

Look for the size printed on your old filter or measure the filter slot in your system. We recommend rounding up to the nearest 1/8” for custom sizes. You can also visit our How to Measure Filters page for step-by-step help.

Do you offer bulk discounts or commercial pricing?

Absolutely. If you’re ordering for a business, property, or large facility, we’ll provide a quote and recommend the right products for your needs. Reach out to our Commercial Services team anytime.

What is MERV?

What is a MERV rating and why does it matter?

MERV (Minimum Efficiency Reporting Value) rates how well a filter captures airborne particles. The higher the MERV rating (typically 1–13 for residential use), the finer the particles it can trap—from dust and pollen to bacteria and smoke. We offer filters from MERV 1–13 to match your system’s needs and your air quality goals. Learn More

Will a higher MERV rating restrict airflow?

Filters with higher MERV ratings are denser and can reduce airflow in systems not designed for them. MERV 8–10 is a safe choice for most homes. For MERV 11 or 13, ensure your system can handle the increased resistance or contact our team—we’re happy to help you choose the right balance of efficiency and airflow.

Will using a high-MERV filter damage my HVAC system?

Not when matched properly. All of our filters are designed for low pressure drop and optimal airflow. If you’re unsure, contact us—we’ll help you choose a filter that your system can handle safely.

Do higher MERV filters improve indoor air quality?

Yes. Filters with higher MERV ratings (10–13) trap smaller and more harmful particles like mold spores, smoke, bacteria, and allergens. They’re ideal for families, people with asthma or sensitivities, and anyone wanting cleaner, healthier air inside.

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