The general rule of thumb is that a house needs one filter for each air handler. Most homes, especially large ones with multiple HVAC systems, have more than one air filter installed. They are usually placed near the oven or manipulator of the air conditioning system and return grilles. Larger homes often have more than one HVAC system, and each system will normally have at least one air filter.
Therefore, your home may have air filters located in the air handling unit AND on returns. It is important to check every possible location to make sure all of the filters are accounted for. Clogged filters require the system to put more effort into maintaining standard air circulation in your home. Households that have a lot of occupants and pets will likely notice that their air filters need to be changed more frequently.
In recent years, this air cleaning function has become more important for homeowners, and manufacturers have designed filters that use their heating and air system to remove microscopic particles such as dust, pollen, pet dander, bacteria, plant spores and mold, and even smoke from the air of your home. As the air is drawn in, the filter traps airborne particles and prevents them from blocking the blower and accumulating on the coils. The ingenious Filtrete S-UR22-2PK-6E intelligent refillable AC oven air filters fit many return filters, although you should always check the measurements first. Knowing the correct size of the mini fridge you are looking for can be useful, not only for planning how to transport it, but also to organize your home. Air filters typically have a MERV (Minimum Efficiency Report Value) that determines the type and size of contaminants against which the filter will act. The only type of filters that trap allergens and spores are HEPA, or high-energy particulate air filters.
Here's a look at the basics of what air filters do, the types of air filters, and how often they need to be changed based on your particular home situation. If you don't occupy a house for several months or only live there part time, the weeks or months you don't use air don't count toward filter use. Chances are that your air filter is located right next to the air handler for your oven or air conditioning system. That said, you should only consider those timelines as the maximum possible lifespan for each filter. However, the most common type of filter is not popular with homeowners due to its low filter quality.
Either way, make a habit of inspecting your filter and your entire HVAC system for optimal and consistent results.
