The air filter in your home can be located in a variety of places, depending on the type of HVAC system you have. In a vertical upflow system, the air cleaner is usually located at the bottom, while in a vertical downflow system it is usually at the top. In horizontal HVAC systems, which are typically found in attics, garages, or large basements, the air cleaner is usually placed vertically in a slot on the side of the unit. It is also usually close to your home thermostat and in a return duct.
In some systems, filters are located in the return air duct, which draws air from your space and returns it to the air conditioner's air handling system. If you have a large system with multiple air handlers and return ducts, finding the filters can be a challenge. The air filter can also be difficult to locate in some HVAC systems, but it is usually found in the return air duct or close to the air handler of your air conditioning system. When replacing an air filter, it is important to note that many filters are reinforced to prevent airflow from collapsing the filter material and leading it directly to the fan itself.
Additionally, most filters have an arrow indicating the intended direction of air flow through the filter. If you are still having trouble locating your air filter after reading this guide, then photos can be helpful. The photos above and below illustrate some possible locations for an air filter. Additionally, if you have a heat pump in your attic and cannot find any filters there, then you may need to clean it to get cold air. Knowing where your air filters are located and that you have found them all makes it easy to inspect your air filters and change them regularly during the cooling or heating season.
This will help keep your HVAC system running efficiently and reduce energy costs.
