While most aspects of HVAC maintenance is best left in the hands of an experienced professional, one of the most important things any homeowner can do is check the air filters. Air filters are often overlooked, but they are a vital component of your HVAC system. So, here we will explore all you need to know about your air filter to protect your HVAC system.
Where Are the Filters?
For many homeowners, one of the most challenging aspects of checking HVAC air filters is finding them. Different systems tend to have different locations for its filters. It is always a good idea to familiarize yourself with your HVAC system and know where your filter is located. Typically, the filters can be accessed behind a panel in the return air duct near the indoor unit or furnace. This may mean that the access to check your filters is in your utility closet, basement, garage, attic or even a crawl space.
On older systems, the filter may even be inside your furnace, near the blower motor. You may even find that your system has a central grille installed in your ceiling or a wall that swings open to reveal the filter.
How Often Should Air Filters Be Checked?
Most experts recommend that air filters are checked each month. If your HVAC system has disposable filters that are usually identifiable by their cardboard edge, the filter can simply be replaced if you find that it’s dirty. You should avoid trying to clean a disposable filter as you’re not likely to improve the filter and you could compromise the performance of your HVAC system.
While some 1” higher efficiency pleated filters can last up to three months, it is better to check more frequently, particularly in higher use periods or if you have pets in your household.
Changing Your Filters
Once you have located your filter and found it is dirty, you will need to replace it. Remember that filters tend to be directional, so air only flows through the filter in a single direction. You’ll need to check for an airflow symbol or arrow to show the direction. This will usually point towards your air handler or furnace. If there is no arrow on your filter, you’re likely to find one side looks or feels rougher; this is to collect any dust or debris, so you’ll need the other side of the filter to face the equipment.
Cleaning Your Filter
If your system does not use a disposable filter, you’ll need to clean it to avoid it becoming clogged with debris. Before starting, you’ll need to check the thermostat is off, so you can remove the filter.
Spray the filter with water using a garden hose or faucet with good water pressure. If the filter is very dirty, you may need to repeatedly clean both sides to clear any debris. Don’t be tempted to try to rush this process with too much water pressure or to try to scrub the filter as you could cause damage to the filter media. Once the water is running clear, it is a good sign that your filter is clean.
Shake off any excess water and try to let your filter completely dry. While you can reinstall a filter that is a little damp, it is better to allow it to fully dry. If you let the filter sit out in the sunshine, it is likely to not only dry, but freshen up.
Once your filter is dry, slide it back into the rack, checking the airflow direction.