What to Do If You Can't Find the Right Furnace Filter Size for Your Home?

Are you tired of searching for the perfect furnace filter size for your home? We understand your struggle! It can be frustrating to spend hours navigating through different stores and websites, with no luck finding the right size.

But don't worry! In this article, we'll share some useful tips on what to do if you can't find the right furnace filter size for your home. Whether you need a permanent or temporary solution, we've got you covered.

So, sit back, relax, and let us guide you through the process of finding the perfect furnace filter for your home. Say goodbye to the days of struggling to fit the wrong size filter into your furnace, and say hello to a more comfortable and efficient home heating experience!

Measure Your Furnace Filter Size

When it comes to finding the right furnace filter size for your home, the first step is to measure your current filter. Here are the steps you need to follow:

Step 1: Turn off your furnace: Make sure your furnace is turned off before you remove the filter. This will ensure you don't cause any damage to your system.

Step 2: Locate the filter: The furnace filter is usually located in the return air duct or the air handler unit. If you can't find it, check your furnace manual.

Step 3: Remove the filter: Carefully remove the filter from its slot. Take note of how the filter is facing, so you can replace it in the correct direction.

Step 4: Measure the filter: Using a measuring tape or ruler, measure the length, width, and depth of the filter. Make sure you measure the filter itself, not the cover or the frame. Note down the measurements in inches.

Step 5: Determine the filter size: To determine the filter size, you need to know the length, width, and depth of the filter. Most filters will have these dimensions printed on the side, or you can check the furnace manual. If you can't find the right size, don't worry; you can always go for a custom-sized filter.

By following these simple steps, you can easily measure the size of your furnace filter and purchase the right one for your home. Remember, it's essential to replace your filter regularly to maintain optimal air quality and ensure your furnace runs efficiently.

Look for Custom and Adjustable Filters

If you can't seem to find the right furnace filter size for your home, don't despair! There are other options available to you. One of these options is to look for custom or adjustable filters. Custom filters can be made to fit your exact specifications, ensuring a perfect fit for your furnace. These filters are typically made from high-quality materials and can provide superior filtration to standard filters. While custom filters may be more expensive than standard filters, they are an investment in the health and comfort of you and your family. Adjustable filters are another option to consider. These filters can be resized to fit a variety of different furnace sizes. They typically come in a range of sizes and can be easily adjusted to fit your specific furnace. While they may not provide the same level of filtration as custom filters, they are a cost-effective alternative to purchasing multiple different filters in various sizes. When choosing custom or adjustable filters, it's important to purchase high-quality filters from a reputable supplier. Look for filters that are made from durable materials and that have a high MERV rating for superior filtration. In conclusion, if you're having trouble finding the right furnace filter size for your home, custom and adjustable filters are excellent alternatives. They can provide a perfect fit for your furnace, ensuring optimal filtration and better air quality for you and your family. So don't give up, explore different options and find a filter solution that suits your needs!

Use Filter Adapters or Frames

If you've exhausted all options and still can't find the right size furnace filter for your home, don't give up just yet. There are filter adapters or frames that you may be able to use instead. These products help ensure that the filter fits perfectly inside the opening of your furnace or air filter.

Filter adapters come in different sizes and shapes to fit different filter sizes. They can be made of rubber or plastic and can be installed quickly and easily. Filter frames, on the other hand, create a more permanent solution. They are installed inside your furnace and hold the filter in place.

While filter adapters and frames can be more expensive than a traditional filter, they offer a long-term solution to your problem. Make sure to measure your furnace filter size carefully to ensure you purchase the correct adapter or frame.

Additionally, you may want to consult with an HVAC professional to ensure that the filter adapter or frame you choose is compatible with your furnace. They may be able to recommend a specific product based on your furnace's specifications.

Using a filter adapter or frame can be a great option when you can't find the right furnace filter size for your home. They can help you keep your HVAC system running smoothly and protect your home's air quality by ensuring that your filters fit properly.

Consult with a Professional HVAC Technician

If you are unsure about the right furnace filter size for your home, it's always best to consult with a professional HVAC technician. They have the necessary knowledge and experience in this field and can help you choose the best filter that suits your system and household needs.

A professional HVAC technician can also assess the condition of your HVAC system and recommend any necessary repairs or maintenance to improve its efficiency and prevent potential issues in the future. They can also guide you on how frequently you should change your furnace filter based on your usage and filter type.

Moreover, if you have tried to find the right filter size on your own but could not do it right, a professional technician can save you time and money by helping you avoid costly mistakes. They have access to a wide range of filter sizes, and can quickly determine the right size your furnace requires.

Lastly, a professional HVAC technician can also provide you with tips on how to extend the life of your furnace and keep it running efficiently for many years by performing regular maintenance and replacing filters when needed.

In conclusion, consulting with a professional HVAC technician is an excellent option if you can't find the right furnace filter size for your home. They have the expertise and tools necessary to help you in this regard, and can also help you keep your HVAC system in optimal working condition.

Consider Upgrading Your HVAC System

If you have tried everything, and you still can't find the right furnace filter size for your home, it might be time to consider upgrading your HVAC system. Older HVAC systems often have odd-sized filters that are difficult to find, and even if you do find them, they may not be as effective as newer, standard-sized filters. Upgrading your HVAC system can not only solve your filter size problem but also provide a host of other benefits. Newer systems are much more energy-efficient and can save you money on your monthly energy bills. They also produce cleaner air and can improve the overall air quality within your home. Before you upgrade your HVAC system, however, it's important to do your research and speak with a professional. HVAC systems can be expensive, and you want to make sure you are choosing the right system for your home and your budget. A professional can help you determine which system will be the most efficient and effective for your needs. In addition to upgrading your HVAC system, there are other steps you can take to improve your home's air quality. These include regularly changing your air filters, keeping your home clean and free of pollutants, and using an air purifier. Remember, the air you breathe in your home can have a big impact on your health and well-being. If you're having trouble finding the right furnace filter size, it may be time to consider investing in a new HVAC system. Speak with a professional today to learn more about your options.


When it comes to finding the right furnace filter size for your home, remember, there are always alternative solutions. Don't just settle for any size that fits, as it can lead to costly damages or even harm to you and your family's health. Take advantage of the options available, such as custom or washable filters, and consult with experts for recommendations. Doing so will ensure your furnace runs smoothly and efficiently, providing clean and healthy air for you and your loved ones.

In the end, taking the time to find the right furnace filter size is a small investment that can save you money and improve your quality of life in the long run. It's worth the effort to ensure your home remains comfortable and healthy.

Frequently Asked Question

It's important to know the size and type of furnace filter you need before replacing it. This is because different furnaces require different sizes of filters. Your brand of furnace may need an electrostatic or media filter of a particular size - so make sure to check your old filter for these details.

Replacing your filter regularly can save you money in the long run. It helps your HVAC system become more efficient, and also keeps the air quality high. So, what are the most common furnace filter sizes?

The most popular furnace filters come in the following dimensions: 10x20, 14x20, 16x24, 18x30, 12x12, 14x24, 16x25, 20x20, 12x20, 14x25, 18x18, 20x24, 12x24, 14x30, 18x20, 20x25, 12x30, 15x20, 18x24, 20x30, 12x36, 16x20, 18x25, 24x24 and 25x25. You can use your existing filter as a reference guide to find the perfect size for your furnace. The filter dimensions should be printed on its frame as length x width x height.

In conclusion, it's important to know your furnace filter size before you replace it. Doing so will improve your HVAC system's efficiency and save you money in the long run. Plus, a clean filter is key to keeping your air quality high.

When it comes to furnace filters, exact size matters. If you get a filter that is too small or too big, air will flow around it instead of through it, meaning not all of the air will be filtered. That's why it's essential to use the right size filter for your HVAC unit.

Here's what you need to know: the size of the air filter is typically listed in the big, bold font on the packaging, which is known as the nominal size. This is a rounded-up whole-number version of the actual size, which is written in the fine print on the filter's frame. That's usually 0.25'-0.5' smaller than the nominal size, and the actual measurements of the filter may vary slightly depending on the brand.

In some cases, less common sizes come true to size, meaning the nominal size is the same as the actual size. When that's the case, it's usually noted with “actual size” in parentheses on the filter's frame.

So, the verdict is in: the answer to the question 'Do furnace filters have to be exact size?' is a resounding yes! Be sure to get the right size air filter for your system to ensure it runs smoothly and that you reap all the benefits your filter has to offer.

Are you looking for the best furnace filter? Look no further! Our team of experts at This Old House Reviews have researched the top five furnace filters on Amazon to help you find the perfect one for your HVAC system. Plus, these products are available at local home centers or online retailers like Amazon.

A great furnace filter can make all the difference. It will keep your HVAC system running smoothly, potentially leading to lower electricity bills and better air quality. That's why we've taken the time to compile a list of the best furnace filters for you.

At the top of our list is the Filtrete furnace air filter. It promises to last up to three months and outperform filters made with fiberglass. Plus, it can capture 64% of airborne particles like pet dander and pollen. This filter also comes with instructions for easy installation on HVAC systems that require filters 20 by 25 by 1 inches in size.

Customers love this furnace filter. They find it easy to install, sturdy, and a great value. However, some customers have faced difficulties with Filtrete’s app.

When choosing a furnace filter, make sure to take into account its size, filtration level, and material. That way, you can get the best filter for your specific needs.

Changing or replacing your furnace filter is one of the best ways to maintain a healthy, efficient HVAC system. But you need to make sure that you're using the right filter for your system. Here's a step-by-step guide to help you pick the perfect one!

First, measure the dimensions of your existing filter. This will tell you the length, width, and depth you need. The easiest way to do this is to look at the existing filter and buy the same size.

Next, you need to choose the right MERV rating. The MERV scale ranges from 1-20 and measures the filter's effectiveness at catching particles in the air. The higher the value, the more effective the filter is at trapping particles, but it also means less airflow.

Now it's time to decide on the type of filter. There are many options available, so take some time to research the best type for your system.

Once you have everything you need, it's time to install the filter in your furnace/air handler slot. Remove the old filter to make room for the new one.

Finally, make sure to replace your filter regularly. If it clogs up with dust and particulate, it can reduce airflow and become ineffective.

Furnace air filters are essential for your heating system. You should replace your filter at least once every three months. So, how do you select the best furnace filter for your needs? Let us help you out!

Generally, furnace filters are made up of a cardboard frame, fiberglass filter, and metal mesh. These materials work together to strengthen the filter and protect your HVAC components from dust and debris. Plus, they also help improve the air quality in your home. Without a filter, your HVAC system could become dirty and its performance would suffer.

As air passes through the furnace filter, it traps and catches any contaminants. If you don't replace or clean your filter regularly, it can obstruct airflow and cause damage to your HVAC system. In most cases, you should change your furnace filters every three months. However, you may want to replace them more or less often depending on the situation.