Changing your furnace filter is one of the easiest and most important maintenance tasks you can do for your home. A clean filter ensures good air quality, improves furnace efficiency, and can even extend the lifespan of your heating system. This guide will walk you through the simple steps of putting in your furnace filter, so you can breathe easy knowing your furnace is running smoothly.
Why Changing Your Furnace Filter Matters
Think of your furnace filter as your home’s air purifier. It traps dust, dirt, pollen, pet dander, and other airborne particles, preventing them from circulating through your home and building up inside your furnace.
A clean filter offers several benefits:
- Improved Air Quality: Cleaner air means healthier breathing for you and your family, especially those with allergies or respiratory sensitivities.
- Increased Energy Efficiency: A dirty filter restricts airflow, forcing your furnace to work harder and consume more energy. A clean filter allows for optimal airflow, saving you money on your energy bills.
- Extended Furnace Lifespan: Restricted airflow can cause your furnace to overheat, leading to premature wear and tear and potentially costly repairs. A clean filter helps your furnace run smoothly and last longer.
Finding Your Furnace Filter Location
The first step is locating where your filter goes. It’s usually found in one of two places:
- In a Slot on the Furnace: Many furnaces have a dedicated slot on the side, top, or bottom where the filter slides in. This is the most common location.
- In the Return Air Duct: The filter might be located in the return air duct, where air is drawn into the furnace. This is often a larger, rectangular opening in a wall or ceiling.
If you’re having trouble finding it, consult your furnace’s owner’s manual. It should have a diagram or instructions indicating the filter location.
Choosing the Right Filter
Before you can put in a new filter, you need to have the right one. Here’s what to consider:
- Size: The most important factor is the filter size. This is usually printed on the side of the old filter. If you don’t have the old filter, measure the opening where the filter goes (length, width, and depth). Remember that filter sizes are usually listed as “nominal” sizes, which are rounded to the nearest inch. The “actual” size is usually slightly smaller.
- MERV Rating: The Minimum Efficiency Reporting Value (MERV) rating indicates the filter’s ability to capture particles. Higher MERV ratings capture smaller particles but can also restrict airflow more. For most homes, a MERV rating between 8 and 11 is a good balance between filtration and airflow.
Putting in Your Furnace Filter: Step-by-Step Guide
- Turn Off the Furnace: Before you do anything, turn off the power to the furnace. This is a crucial safety step. You can do this by switching off the power at the breaker box or by turning off the switch on the furnace itself.
- Remove the Old Filter: If there’s an old filter in place, carefully slide it out. Be mindful of any accumulated dust or debris. It’s a good idea to have a trash bag handy to dispose of the old filter immediately.
- Note the Airflow Direction: On the side of the old filter (and the new one), you’ll see an arrow indicating the direction of airflow. This is very important. The arrow should point towards the furnace (i.e., in the direction the air is flowing).
- Insert the New Filter: Slide the new filter into the slot or opening, making sure the airflow arrow is pointing in the correct direction (towards the furnace).
- Replace Any Access Panels: If you removed any access panels to reach the filter, put them back in place and secure them.
- Turn the Furnace Back On: Once the new filter is in place and any panels are secured, you can turn the power back on to your furnace.
It’s recommended to check your furnace filter every 1-3 months. If it looks dirty, it’s time for a change. Set a reminder on your phone or calendar to remind you to check your filter regularly.
Don’t Run the Furnace Without a Filter! Running your furnace without a filter can allow dust and debris to build up inside the system, which can reduce efficiency and cause damage.
What if:
- Filter Doesn’t Fit: If the filter doesn’t fit, double-check the size you purchased against the size of the opening. You may have measured incorrectly or purchased the wrong size.
- Can’t Find the Filter Location: If you can’t find the filter location, consult your furnace’s owner’s manual or contact an HVAC professional.
By following these simple steps, you can easily change your furnace filter and keep your furnace running efficiently and your air clean. It’s a small task that makes a big difference in your home’s comfort and your furnace’s performance.
