Ameer Randolph
Changing the fuel filter in your furnace is a simple task that can improve your heating in the winter and your air conditioning in the summer. It can also help to keep your energy bills down, as a dirty filter can cause your furnace to work harder and increase energy usage.
To change the filter, first turn off your furnace and locate the filter housing, which is usually between the air intake and the furnace. Open the compartment door and slide out the old filter. Compare the size and type of the old filter with a new one, and slide the new one into place, making sure to follow any arrows that indicate the direction of airflow. Finally, secure the compartment cover and turn your furnace back on.
| Characteristics | Values |
|---|---|
| How often to change the filter | Check monthly, change every 3-6 months |
| When to change the filter | When it's dirty, or clogged |
| Where to find the filter | Between the air intake and the furnace |
| How to find the filter | Locate the filter housing, open the compartment door |
| Filter direction | Arrows on the filter should point towards the furnace |
| Filter types | Disposable (fiberglass, paper), permanent (aluminium, plastic) |
| Filter costs | Disposable fiberglass is the cheapest option |
| Filter benefits | Protects the furnace, improves air quality |
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What You'll Learn
Locate the furnace filter
Locating the furnace filter is the first step to replacing it. Furnace filters are typically between 1 and 5 inches thick, so they can be difficult to find. The placement of the filter depends on the specific make and model of your furnace, so it is recommended to refer to the owner's manual. However, there are some general indications that can help you locate the filter.
First, determine the type of system in your home. If you have a central cooling system, the furnace shares the same air handler as the air conditioner. The furnace is usually located in the same vicinity as the water heater and/or washing machine. Once you have found the furnace, look for the air handler, which is sometimes located in the basement or crawl space. It may also be in the attic, or in smaller homes, in an indoor closet.
Next, look for the slotted compartment where the filter goes. This is usually on the front side of the handler, near where the large intake air duct enters the handler. The compartment will be covered with a removable plastic or metal sleeve. Once you slide the cover away, you can access the filter.
If you are still having trouble locating the furnace filter, try following the airflow path from the return vent to the furnace or air handler. The filter is usually located in the blower compartment, between the furnace and the return air duct. It may be in a slide-in rack on the side of the unit or behind a removable access panel, which can be made of plastic or metal and is usually located at the front or side of the furnace.
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Remove the old filter
To remove the old furnace fuel filter, start by turning off your furnace. Locate its thermostat and set it to the "off" position. This will prevent the furnace from turning on while you are checking or replacing the filter.
Next, locate the service panel or filter service rack/door. This is most likely on the side with the intake and outtake blower fan. Open or slide the door panel off your furnace to access its interior. If your door is the type that slides off, you can typically remove it by simply lifting it up until it comes free, and then set it aside.
Now, locate the filter. The filter is usually located at the air return duct or the entrance to the blower chamber. There may be another cover over the filter that you will have to pull off. Look for the vents where the air enters the furnace system to help locate the filter.
Once you've located the filter, slide it out and hold it up to the light. Use both hands to carefully pull the filter out for inspection. If there is any resistance when you try to slide the filter out, there may be a locking mechanism in place. Check for this and slide the lock out of the way to release the filter.
If you can't see through the filter when you hold it up to the light, it's time to replace it. Disposable filters will have a cardboard frame. If your filter has a plastic or metal frame, it is a reusable filter that you can clean instead of replacing.
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Check if a new filter is needed
Checking if your furnace fuel filter needs to be replaced is important for maintaining the efficiency of your HVAC system and the air quality of your home. Here are some detailed instructions on how to determine if you need a new furnace fuel filter:
Inspect for Dirt and Dust Build-Up
One of the most obvious signs that your furnace filter needs to be replaced is a visible build-up of dirt and dust on and around the filter. You can compare the surface around the furnace vent to the areas surrounding the furnace. If the vent area is dustier than the surrounding areas, it indicates that the filter is not effectively trapping the dust, and it needs to be replaced. Additionally, you can remove the filter and check for a noticeable release of pressure, which would suggest that it is clogged with dirt and dust.
Assess the Colour of the Filter
A clean furnace filter is typically white or light-coloured. Over time, as it traps impurities, it will become discoloured and take on a grey or brown hue. Inspect your furnace filter for any discolouration, as this is a clear sign that it needs to be replaced.
Evaluate the Frequency of Dusting
If you find yourself dusting your home more often than usual, it could be a sign that your furnace filter is not functioning optimally. Clean furnace filters help maintain indoor air quality by trapping dust and allergens. If your filter is clogged, these particles will circulate in the air, settling on surfaces in your home.
Monitor the Performance of Your HVAC System
Pay attention to how your HVAC system is functioning. If it seems to be working harder than usual, it may be due to a clogged furnace filter. Signs of a struggling HVAC system include longer cycle times, reduced airflow from the vents, and uneven heating or cooling in different rooms. These issues indicate that your furnace filter is not allowing proper airflow, and it may be time for a replacement.
Check for Unusual Odours
Unusual odours emanating from your HVAC system could be a sign of a dirty furnace filter. A clogged filter can cause a musty or burning smell. If you notice any unpleasant or unusual odours, it may be time to replace your furnace filter.
Keep Track of Time and Manufacturer Recommendations
It is recommended to check your furnace filter every 30 days and replace it every 3 months. However, this may vary depending on the manufacturer's guidelines and other factors such as HVAC usage, the MERV rating of the filter, and lifestyle factors like pets or smokers in the house. Keeping track of time and referring to the manufacturer's recommendations can help you determine if it's time for a new filter.
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Buy a new furnace filter
When buying a new furnace filter, there are several factors to consider, including the type of filter, the size, and the frequency of replacement. Here is a detailed guide to help you make the right choice:
Types of Furnace Filters
The most common types of furnace filters include:
- Basic Panel Filters: These are typically made of paper or fiberglass with a pleated design. They are inexpensive and effective at trapping larger particles such as dust and debris. However, they may not provide the highest level of filtration for improved indoor air quality.
- Electronic Air Filters: These filters use static electricity to capture particles such as dust, pet dander, and allergens. They are more expensive but offer premium air quality by filtering up to 99% of particulates.
- Combination Filters: These filters are relatively inexpensive and provide better filtration than basic panel filters. They can last up to six months before replacement and are a good compromise between cost and effectiveness.
- Electrostatic Filters: These are reusable filters that can trap smoke and smaller airborne particles. They can be rinsed with a garden hose and reused for several years, making them a cost-effective and environmentally friendly option.
Sizing Your Furnace Filter
When purchasing a new furnace filter, it is crucial to get the correct size. The most common residential furnace filter sizes are 16 x 25 x 1 inches, 20 x 25 x 1 inches, and 16 x 20 x 1 inches. Measure the size of your current filter or refer to the owner's manual to ensure you buy the right size.
Frequency of Replacement
The frequency with which you should replace your furnace filter depends on several factors, including the type of filter, the amount of dust and dirt in the environment, and any respiratory or allergy concerns. Basic fiberglass filters should be replaced every one to two months, while paper filters can last up to a year. Electrostatic filters can last several years if cleaned regularly, especially in households with pets, smokers, or high dust levels.
Where to Buy
You can typically find furnace filters at home improvement stores, hardware stores, or online retailers. Some companies, like American Home Shield, offer members discounted prices on filters. It is always a good idea to have at least one spare filter on hand, so you can replace it as soon as it becomes necessary.
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Install the new furnace filter
Now that you've purchased a new filter, it's time to install it.
First, check the filter for an arrow on the edge. This is important as it indicates the direction of the airflow. The arrow should point towards the blower motor. Placing the filter in the wrong direction will decrease its efficiency. A helpful tip is to mark an arrow on the furnace panel to remind yourself which direction to place the filter.
Next, slide the new filter into the filter rack or compartment. Make sure it's secure and won't fall out. Then, replace the cover of the filter rack or compartment.
Finally, turn your furnace back on. It's a good idea to make a note of the date you changed the filter so you can remind yourself to check it again in a month.
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Frequently asked questions
Check your filter every month to see if it needs replacement. Most disposable types of filters are designed to be replaced every 1-2 months. If you have furry pets or your furnace runs all the time, then your filter will get dirty more quickly.
Hold the filter up to a light source to check how dirty it is and determine if it is time to replace it. If there is no light shining through the filter, it's time for a new one.
The filter is usually located at the air return duct or the entrance to the blower chamber. There is sometimes another cover over the filter that you will have to pull off.
First, make sure your furnace is turned off so it doesn't blow air when you remove the filter. Open or slide the door panel off of your furnace. Locate the filter and remove any cover that is over it. Slide out the old filter and replace with a new one of the same size. Slide the new filter in so that the arrow is facing the furnace’s blower motor. Snap the filter cover back into place and turn your furnace back on.
The cheapest disposable furnace filters are fiberglass with cardboard frames. This kind of filter will trap large particles of dust and is designed to be replaced every 1-2 months. If you want to upgrade your filter, you can get a slightly more expensive disposable pleated filter, which will trap smaller particles of dust, pollen, and dirt. These filters last longer; from 4 months to 1 year.
