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Written on: March 3, 2025
Changing your furnace filter is one of the easiest and most important tasks you can do to keep your HVAC system running efficiently. Not only does it help improve indoor air quality, but it also boosts the overall performance and longevity of your furnace. While the task may seem simple, many homeowners aren’t sure when or how to replace the filter. If you’re unsure, don’t worry. Just use this step-by-step guide!
Before diving into the process, let’s first understand why changing your furnace filter is so important. The filter traps dust, dirt, pet dander, pollen, and other particles from the air. Over time, these particles build up and clog the filter, which can restrict airflow, forcing your furnace to work harder. A clogged filter reduces efficiency, increases energy consumption, and can even cause your furnace to overheat and fail. Regularly changing the filter helps maintain air quality, prevents system malfunctions, and ensures your furnace runs smoothly.
Follow the steps below to change your furnace filter:
Step 1: Turn off the furnace.
The first thing you want to do before touching your furnace is turn it off. Locate the power switch on your furnace (often found on the side or near the unit) or turn it off from the circuit breaker. This is a safety precaution to ensure you don’t accidentally trigger the system while changing the filter.
Step 2: Find the filter.
Next, locate the furnace filter. If you’re unsure where the filter is located, check the furnace owner’s manual for guidance. Filters can usually be found in one of two places:
Step 3: Remove the old filter.
Once you’ve located the filter, carefully slide it out of its slot. Depending on your furnace, the filter may be secured with a frame or held in place by clips. Gently pull the filter out of the housing, being cautious not to damage it or any surrounding components.
Before discarding the old filter, take note of the direction it was installed. Filters typically have an arrow indicating airflow direction, which is important for installing the new one correctly.
Step 4: Check the filter for size and type.
Take a moment to check the size and type of filter you need. Furnace filters come in various sizes and materials, so it’s crucial to match the new one with the old. You can usually find the size on the filter itself, which is listed as a series of three numbers (e.g., 16″ x 20″ x 1″). Be sure to buy the correct size, as using the wrong filter may affect airflow and efficiency.
Step 5: Install the new filter.
Now, it’s time to install the new filter. Insert the new filter into the same slot as the old one, ensuring the airflow arrows are pointing in the correct direction (which is typically toward the blower motor). Slide it in gently, making sure it fits snugly and securely. If the filter doesn’t fit properly, it can allow dust and debris to bypass the filter, reducing its effectiveness.
Step 6: Turn the furnace back on.
Once the new filter is in place, turn the furnace back on by switching the power back to “on” or resetting the circuit breaker. Check to ensure everything is working properly and listen for any unusual noises. Your furnace should be running smoothly with the new filter in place.
Step 7: Set a reminder to change it again.
Furnace filters typically need to be replaced every 1–3 months, depending on the type of filter and your home’s conditions (e.g., pets, allergies, or high dust levels). Set a reminder on your phone or calendar to change it again, so you never forget!
Changing your furnace filter is a simple yet essential task for keeping your home comfortable and your HVAC system running efficiently. By following the steps outlined above, you’ll ensure your furnace continues to operate smoothly, improve your indoor air quality, and save on energy costs. Regular filter changes can also extend the lifespan of your furnace, making it a small task with big benefits!
Companies like Downey Energy provide expert care for furnaces. Their services include regular tune-ups, equipment cleaning, and professional repairs, ensuring your furnace runs at peak performance throughout the winter. Proper care reduces costly breakdowns and extends your equipment’s lifespan.
Keeping your furnace clean is an investment in your home’s comfort and safety. Combine DIY filter changing with professional servicing for the best results.
You can trust Downey Energy to help maintain a reliable heating system in your home for years to come.
At Downey Energy, we’re the furnace experts! Whether you use propane, heating oil, or natural gas in your Hudson Valley home, Downey Energy can provide you with the furnace you need. We also offer maintenance and repair services. And our service plans include an annual tune-up and around-the-clock emergency service. Depending on your needs, you can choose a plan that covers many parts and labor costs as well.
Contact Downey Energy today to schedule a tune-up for your heating system or to enroll in one of our service plans.
