The 20x25x1 air filter is designed for residential furnace and HVAC systems, helping improve indoor air quality while protecting your equipment.
Whether you need a 20x25x1 furnace filter or a high-efficiency HVAC air filter, this size is commonly used and should be replaced every 30–90 days.
Actual size: 19.5 x 24.5 x 0.75 inches
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For best indoor air quality, we recommend you change your HVAC or furnace air filters regularly at different times depending on your situation.
Replace your air filter every 6 weeks to minimize the circulation of bacteria and allergens in the air.
Replace air filters every 2 months to reduce odors as well as pet dander and hair buildup in your system.
Replace your air filter every 2-3 months to reduce airborne particles and maintain cleaner indoor air.
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Check the label on your current filter or use a tape measure to determine the length, width, and thickness. Just make sure you know the difference between nominal and actual size.
Nominal Size: 20x25x1
Actual Size: 19.5x24.5x0.75
Nominal size is what you normally see printed on the label. This is usually a rounded size which is often not the true size of your filter.
Actual size is the true size of the air filter, usually written in smaller font below the nominal size.
Measure your current air filter or the length, width, and depth of the opening slot to get the actual size. Round it up to the nearest whole inch to get the nominal size.
Installing 20x25x1 furnace filter or HVAC air filter is easy. Just make sure to align the arrow printed on the side with the airflow direction!
Remove the air filter from the package
Locate the arrow and point it in the direction of the fan
Slide the filter in to the slot of the central unit
For return grills, insert the filter into the grill, pointing the arrow inwards
Keeping your air filter replacement schedule in mind can be challenging to say the least. Make your life easier with Filter King's auto delivery.
90 percent. That's how much of their time the average person spends indoors, according to data from the Environmental Protection Agency.
Noting this, it's crucial to prioritize the quality of the air you and your family breathe. Home air filters are a big part of maintaining quality indoor air. High-end, properly sized air filters effectively capture dust, pollen, mold spores, pet dander and other airborne particles, preventing them from circulating throughout properties and promoting a healthier overall indoor environment.
Proper 20x25x1 home air filters also allow your system to run more effectively and can help reduce the overall workload on your furnace and cooling system. This can help reduce your home's heating and cooling costs and the frequency of HVAC system repairs.
This post serves as a guide to your home air filter buying needs. It covers everything from your MERV options to the various types of efficient pleated air filters, and cost and value analysis for replacements. Read on to learn more.
First, let's cover some of the common mistakes that property owners make when selecting 20x25x1 furnace filters or HVAC air filters for their home. These include:
MERV stands for "minimum efficiency reporting value" and indicates a filter's ability to trap particles. Choosing a filter with a low MERV can result in less particle capture, while filters with high MERVs capture more, but they may also restrict airflow. It's best practice to select a MERV rating that balances your property's air quality needs with its HVAC system requirements and capabilities.
There is no universal MERV rating. Instead, consider selecting a 20x25x1 furnace or HVAC air filter that reflects the level of particle capture you're looking to attain. The filter you select should consider your HVAC system and household factors, such as pets, allergies, smoking, typical dust levels and the surrounding environment.
Many home owners choose low prices over quality and performance. However, when it comes to air filters, you often get what you pay for. Cheaper furnace or HVAC air filters may not effectively trap particles and pollutants, which can result in poor overall air quality throughout the property. Avoid this pitfall by selecting the 20x25x1 air filter that combines your required filtration quality level without being overly restrictive on your HVAC system.
It's also important to note that not all brands are created equal. For best results, make sure you're using filters from a brand that prioritizes quality and construction.
The industry standard is to replace your 20x25x1 air filter every 90 days for average households or as often as 60 days for homes with pets or indoor smokers. Households with individuals sensitive to allergens should change their 20x25x1 air filters as often as every 6 weeks. Waiting too long for a replacement can lead to soiled filters that restrict air flow, causing excess wear and tear on your HVAC system and increasing your utility bills. Many home owners also mistakenly change their air filters too soon, which creates an unnecessary and easily avoidable expense.
MERV is an industry-standard rating system that measures the efficiency of a 20x25x1 air filter in capturing particle matter. It is based on a scale from 1 to 20. The higher the rating, the better the filter is at capturing particles — and vice versa. Low MERV filters aren't able to capture many fine particles, while high-efficiency HEPA filters can capture 99.97 percent of particles at or around 0.3 microns in size.
Yet, a higher MERV isn't always better for your home or HVAC system. It's important to match the MERV rating to your specific household needs and your HVAC system's capability. Check the recommended MERV rating in your specific HVAC system owner's manual to ensure compatibility and balance it with any unique household requirements.
Here's an overview of the most commonly used MERV ratings for 20x25x1 furnace and HVAC air filters that are also offered by Filter King:
Choosing the right air filter isn't as easy as it may seem. From fiberglass filters to pleated filters, HEPA filters and carbon models, and even washable, reusable filters, the best air filter for your household depends on your specific needs and your cooling and heating unit's requirements.
Pleated air filters tend to offer the ideal balance that suits most requirements and residential HVAC systems. They are typically made from cotton or polyester material and feature a large, folded filter frame to capture particles and promote cleaner air throughout a property. These larger accordion-style pleats are designed to capture more particles without restricting airflow. Aside from maximum filtration, pleated filters also tend to have longer lifespans and are more cost-effective.
Air filter size matters for improving indoor air quality and maximizing health benefits. Here's a look at some of the key health benefits your household can experience by finding the right 20x25x1 filter:
Above all, selecting filters that fit properly helps improve your property's indoor air quality by removing airborne contaminants and particles. This directly results in a cleaner and more hygienic overall environment.
What's the best 20x25x1 air filter for your furnace or A/C that meets your household needs and suits your HVAC system?
Typically, a single-family home should look for a MERV 8 or MERV 11 20x25x1 air filter. MERV 8 air filters are ideal for capturing general dust and pollen, while MERV 11 filters offer better filtration in residential HVAC systems and can capture smaller particles like pet dander and mold spores.
If your household members are sensitive to allergens, consider a MERV 13 20x25x1 air filter. These filters are highly effective at trapping even the smallest airborne particles, such as pollen, dust, smoke, mold, bacteria and more.
If your home has odor concerns, consider a MERV 13 20x25x1 air filter or a MERV 8 20x25x1 carbon air filter. These filters are ideal for high-dust environments or households with smokers. MERV 8 carbon filters are specifically designed to help eliminate odors, such as those from pets, cooking, smoke or other household chemicals.
Filters with higher MERV ratings tend to cost more than those with lower ratings because they're built with thicker material and designed to be more efficient in capturing small particles to improve your home's indoor air.
Price is directly tied to the filter efficiency in capturing microscopic particles and allergens, thereby reducing indoor air pollution. This higher comparative upfront cost is often offset by health benefits and HVAC equipment efficiency.
When it's time to change your existing filter, you have options. While many home owners choose to purchase air filters on an as-needed basis, you can save significantly on bulk purchases due to volume discounts from lower per-unit prices. This provides more than just a cost savings benefit, but also ensures that you won't run out of air filters when it's time for A/C or furnace filter replacement.
Since it's best practice to change air filters regularly, opting into a subscription plan is another option that can make it easy and convenient for property owners. Filter King offers bulk purchasing and subscription options upon checkout to help you save on 20x25x1 high efficiency air filters.
If you're looking for high efficiency filters for your HVAC system, Filter King is your go-to provider for quality solutions and fast, reliable shipping. Our pleated air filters are designed and constructed to meet the highest standards, delivering reliable performance to optimize HVAC efficiency and help your family breathe cleaner air.
Each filter undergoes MERV rating testing to ensure accuracy in its ability to capture airborne particles. Our filters are also designed with durable frames and manufactured to the exact dimensions to ensure a secure fit, while maintaining airflow.
Select from Filter King's wide range of standard filter sizes or visit our custom air filter page if your HVAC system has unique requirements.
Ready to purchase a new high efficiency air filter? Here's what you need to know before selecting a replacement:
After you've selected the right filter, consider arranging an automatic delivery schedule to ensure you always have a new filter on hand when it's time to change it out.
You should also monitor your filter's performance and adjust as necessary according to your household's needs and HVAC filter requirements. Consider tracking air quality and reassessing MERV choice as necessary. Finally, don't discount seasonal changes that could impact your filter choice. For instance, you might select a high MERV 20x25x1 filter or HEPA filter in the spring and summer when pollen counts are high.
You should replace most 20x25x1 air filters every 30 to 90 days depending on your specific needs and circumstances. In households with asthma or allergies, replace your air filter every 6 weeks. If you have pets, replace it every 2 months. If you have young children, replace it every 2 to 3 months.
Using the wrong size air filter can lead to poorer air quality and cause problems for your HVAC system. If the air filter size is too small, unfiltered air can bypass the filter and allow for dust to enter your HVAC system.
No, never cut air filters to fit your filter slot if you’ve ordered the wrong size. Cutting damages the filter frame and media, creates gaps for air bypass, and reduces filtration effectiveness. If you've ordered the wrong size, Filter King offers a 30-day money back guarantee, so you can easily return or exchange your filter for the correct size.
In many cases it may be worth the extra cost, although it largely depends on your specific needs and circumstances. Higher-quality 20x25x1 filters often provide better filtration, last longer, and protect your HVAC system more effectively, meaning that the investment pays off through better air quality and reduced system maintenance costs.
No, never run your HVAC system without a filter, even temporarily. Running it without a filter allows dust, debris, and particles to enter your system, which can lead to expensive damage to components like the blower motor and evaporator coils.
A MERV 13 20x25x1 filter may restrict airflow in some of the older or lower-capacity HVAC systems, while most modern residential systems should handle a MERV filter without issues. If you notice reduced airflow, longer heating/cooling cycles, or increased energy bills after installing a MERV 13 filter, consider changing to a MERV 11 instead.
MERV 8 filters