How to Find Furnace Filter

Are you tired of constantly changing your furnace filter and not knowing which one to buy? Don’t worry, you’re not alone. Many homeowners struggle with finding the right filter for their furnaces.

Locating the furnace filter is a critical first step in ensuring the efficiency and longevity of your heating system. The furnace filter plays a pivotal role in cleaning the air circulating through your home, capturing dust, pollen, and other airborne particles. Knowing where and how to find this filter is essential for regular maintenance, which can improve air quality and reduce energy costs.

This guide on how to find furnace filter will walk you through the basic steps to identify the placement of the furnace filter, offering insights to make this task less daunting, especially for first-time homeowners or those new to DIY home maintenance.

What are the Benefits of Changing Your Furnace Filter Regularly?

Before we dive into the process of locating your furnace filter, it’s essential to understand why you need to change it regularly. Here are a few key benefits:

1. Improves Air Quality: The primary function of a furnace filter is to capture dust, pollen, and other particles from the air circulating through your home. Over time, these particles can build up and affect the air quality in your home, leading to allergies or respiratory issues.
2. Increases Energy Efficiency: A clogged furnace filter can restrict airflow, forcing the system to work harder and use more energy to maintain a consistent temperature. By regularly changing your filter, you allow for proper airflow and reduce energy consumption.
3. Extends the Life of Your Furnace: A clean furnace filter prevents dust and debris from entering your heating system, which can cause damage and lead to costly repairs. Regularly changing your filter can help extend the life of your furnace.
4. Saves Money: Regularly changing your filter can ultimately save you money in the long run by improving air quality, increasing energy efficiency, and extending the life of your furnace.

Where to Find Your Furnace Filter?

Now that you understand the importance of regularly changing your furnace filter let’s discuss where to find it. Typically, the furnace filter is located near the air handler or blower motor unit. This unit can be found in different areas of your home, depending on your type of heating system. Here are some common places to check for your filter:

• Basement: If you have a forced-air heating system, the furnace filter is most likely located in the basement near the blower unit.
• Attic: Some homes have their furnace, along with the air handler and other HVAC components, located in the attic. In this case, your filter will be near the air handler.
• Closet: If your heating system is located in a closet, check for the furnace filter on or near the blower unit.
• Crawl Space: For homes with a crawl space, the furnace filter is often located in a return air duct near the blower unit.

If you are unable to locate your furnace filter in any of these areas, refer to your owner’s manual or contact a licensed HVAC professional for assistance.

What Will You Need?

Before you begin the process of locating your furnace filter, make sure you have the following items on hand:

• Owner’s Manual: Your heating system’s owner’s manual will provide valuable information on where to find and how to change your furnace filter.
• Flashlight: Depending on the location of your filter, a flashlight may be necessary to help you see in darker or hard-to-reach areas.
• Measuring Tape: It’s important to know the exact size of your filter to ensure you purchase the correct replacement.
• Gloves: Wearing gloves is recommended as furnace filters can be dirty and covered in dust and debris.

Now that you have everything you need let’s get started on finding your furnace filter!

10 Easy Steps on How to Find Furnace Filter:

Step 1. Turn Off the Power:

Before attempting to locate or replace your furnace filter, it’s imperative to ensure your safety by turning off the power to your heating system. This can usually be done by switching off the circuit breaker connected to your furnace, thereby eliminating any risk of electrical shock or injury.

It’s also a preventative measure to avoid any accidental operation of the system while you’re inspecting or changing the filter. Remember, safety should always be your top priority when performing any maintenance on your home’s heating system.

Step 2. Locate the Blower Unit:

Once the power is turned off, your next task is to locate the blower unit, where the furnace filter is typically installed. The blower unit is a crucial component of your heating system, usually situated near the air handler or furnace. In many homes, this unit can be found in the basement, attic, closet, or any dedicated utility space. Look for a large metal box that is part of your furnace system. The filter should be

positioned in a slot on the air intake side of the blower, often marked by a cover or access panel designed for easy filter replacement. Identifying the blower unit is a significant step as it narrows down the area where the filter can be located.

Step 3. Open the Cover or Access Panel:

After locating the blower unit, you will need to find and open the cover or access panel that conceals the furnace filter. This step can vary significantly depending on your furnace model and design. Some covers might easily snap off without the need for tools, while others may be secured with screws, requiring a screwdriver to open. Exercise caution and gentleness to avoid damaging any parts of your

furnace. Once the cover is removed, you should have a clear view of the furnace filter, making it easier to proceed with inspection and replacement. This step is crucial for accessing the filter without causing any damage to the unit.

Step 4. Inspect and Measure the Filter: 

Once the cover or access panel is open, you should have visual and physical access to the furnace filter. At this point, it’s important to inspect the condition of the existing filter to determine if it needs replacing. Look for any signs of excessive dirt buildup, damage, or if the filter appears clogged with dust and debris. If the filter shows any of these signs, it’s time for a replacement. Additionally, use your

measuring tape to measure the dimensions of the filter (length, width, and thickness) if you need to purchase a new one. Most filters will have their size printed on the edge, but measuring it yourself ensures that you buy the correct size for your unit. This step is crucial to ascertain both the condition of your current filter and the size needed for replacement.

Step 5. Purchase a New Filter: 

Once you’ve measured and determined the size of the filter needed, the next step is to purchase a new furnace filter. You can find these filters at most home improvement stores, online retailers, or directly from the manufacturer if you prefer a specific brand. When buying a new filter, consider the filter’s MERV (Minimum Efficiency Reporting Value) rating, which indicates its ability to capture dust and other airborne particles. The higher the MERV rating, the better the filtration, but

ensure it matches your system’s airflow requirements to avoid restricting airflow which can strain your furnace. Remember to bring your old filter’s measurements or model number to ensure you purchase the correct size and type for your furnace.

Step 6. Turn Off the Power (Again):

Before you proceed with the installation of the new furnace filter, it’s critical to ensure that the power to your heating system is turned off once again if you had to turn it back on for any reason after your initial inspection. This step is a crucial safety measure to prevent any accidental electrical shock or injury while changing the filter. Additionally, turning off the power ensures that the furnace does not inadvertently operate while you are in the process of replacing the filter. Always verify that the system is completely powered down before continuing with the replacement process.

Step 7. Insert the New Filter:

With the power securely off, position the new filter in the slot or compartment where you removed the old one. Pay close attention to the direction of the airflow arrows printed on the side of the filter; these should point towards the blower unit, aligning with the direction of airflow through the system. Inserting the filter in the correct orientation ensures that it functions efficiently, trapping dust and pollutants

as air passes through. Gently slide the filter into place, making sure it fits snugly without any gaps around the edges where air might bypass the filter. Proper installation is crucial for maintaining indoor air quality and keeping your heating system running smoothly.

Step 8. Replace the Cover or Access Panel: 

Once the new filter is securely in place, the next step is to replace the cover or access panel you removed to access the filter. Reattach it carefully to ensure it fits properly and securely, using any screws or fastenings that were initially removed. This step not only protects the filter and internal components from dust and debris but also prevents any unfiltered air from entering the system. Ensuring the cover is properly replaced is vital for the overall efficiency of your heating system and for maintaining optimal air quality in your home.

Step 9. Turn the Power Back On: 

After the new filter is installed and the cover or access panel is securely replaced, the final step is to restore power to your heating system. Locate the switch or circuit breaker that controls the power to your furnace and turn it back on. Once the power is on, it’s a good practice to run the system for a few minutes to ensure everything is functioning correctly.

This is also an excellent opportunity to check for any unusual noises or issues that may indicate the filter was not installed properly or there are other concerns with the heating system. Successfully powering back your system signifies the completion of the filter replacement process, ensuring your home’s air quality is maintained and your heating system operates efficiently.

Step 10. Schedule Your Next Filter Change: 

After successfully installing the new filter and ensuring your heating system is running smoothly, it’s important to note the date of the filter change for future reference. Most furnace filters need to be replaced every 90 days, but this can vary based on the filter type, your specific furnace model, and environmental factors such as pet dander, dust levels, and overall air quality in your home. Scheduling

your next filter change helps maintain consistent air quality and furnace efficiency. Consider setting a reminder on your phone or calendar to inspect and, if necessary, replace the furnace filter in the recommended timeframe. This proactive step is key to minimizing energy costs, reducing wear on your heating system, and ensuring a healthy living environment.

By following these steps and regularly replacing your furnace filter, you can maintain clean air in your home and prolong the life of your heating system.

5 Additional Tips and Tricks

1. Check the User Manual: Often, the easiest way to find out which furnace filter you need is to consult your furnace’s user manual. Manufacturers typically list the required filter size and type, providing a straightforward answer to your search.
2. Look for a Sticker on the Furnace: Many furnaces have a sticker on the side that lists the filter size and type. This sticker is usually located on the furnace body, making it an accessible reference point for quick checks.
3. Measure the Existing Filter: If you already have a filter installed, simply remove it and measure it. It can provide you with the dimensions you need. Make sure to measure the length, width, and thickness to ensure you purchase the correct replacement.
4. Consult the Manufacturer’s Website or Support Line: If you’re still looking for the information through your manual or on the furnace itself, visiting the manufacturer’s website or calling their support line can be very helpful. They can offer specific details based on your model’s serial number.
5. Visit a Hardware Store with Your Furnace Model Information: If you’re still unsure, taking your furnace’s model information to a local hardware store can be a great last resort. Employees there often have the expertise to help you find the filter you need or can offer advice on universal filters that might fit your furnace.

With these additional tips, you should have no trouble finding the right furnace filter for your home.

5 Things You Should Avoid When Searching for a Furnace Filter

1. Don’t Guess the Size: Avoid making an educated guess about the size of your furnace filter. Using the wrong size can lead to inefficient heating and cooling, increased energy costs, and potential damage to your furnace.
2. Avoid Ignoring the Filter Type: Not all furnace filters are created equal. Different types are meant for specific needs, such as allergy reduction or pet dander control. Using the wrong type can negatively impact the air quality in your home.
3. Don’t Overlook the MERV Rating: The Minimum Efficiency Reporting Value (MERV) rating indicates the filter’s ability to capture larger particles. Choosing a filter with a MERV rating that’s too high or too low for your furnace can impair its efficiency.
4. Avoid Buying the Cheapest Option Without Research: While it’s tempting to save money, there are better choices than the cheapest furnace filter. Cheap filters often require more frequent changing and can be less efficient.
5. Don’t Neglect Regular Maintenance: Even with the right filter, failing to check and change it regularly can lead to problems. A clogged or dirty filter restricts airflow, causing your furnace to work harder, which can increase your utility bills and decrease the lifespan of your furnace.

By avoiding these mistakes, you can ensure that your furnace filter is effective and efficient in keeping your home’s air clean.

Are Furnace and AC Filters the Same?

Furnace and air conditioning (AC) filters may look similar, but they serve different purposes. Furnace filters are designed to protect the furnace from dust and debris while also improving indoor air quality. AC filters, on the other hand, are primarily meant to improve air quality by removing contaminants such as pollen and pet dander.

While some high-quality furnace filters can be used for both heating and cooling systems, it’s important to follow the manufacturer’s recommendations. Using the wrong type of filter can reduce efficiency and potentially damage your HVAC system.

Overall, it’s essential to choose the right filter for your specific needs and regularly maintain it to ensure optimal performance. With the tips and tricks outlined in this guide, you should be able to find the perfect furnace filter for your home. 

Conclusion

How to find furnace filter is a crucial task that not only impacts the efficiency and longevity of your furnace but also affects the air quality of your home. By following the tips and avoiding the common mistakes outlined in this guide, homeowners can ensure they select the most appropriate filter for their needs.

Whether it’s consulting the user manual, measuring the existing filter, or seeking expert advice at a hardware store, there are several reliable methods to identify the correct furnace filter. Remember, the goal is not just to find a filter that fits but to select one that optimally balances airflow, particle capture, and system efficiency. Regular maintenance and timely replacements will further enhance the benefits of choosing the right furnace filter, leading to a healthier living environment and potentially lower energy costs.

Armed with this knowledge, you are well-equipped to make informed decisions about your furnace filter, ensuring your home’s HVAC system operates at peak performance.