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You should plan to change your AC unit's filter every one to three months, depending on the manufacturer's recommendations. You should also clean the coils at least once per year, but if you have pets or someone in your household has allergies, you might need to clean them more often. Fortunately, many pros will clean the coils and change the filter for you during an inspection, which you should schedule once or twice per year.

Putting an air filter in backward can reduce airflow, which means your air conditioner has to work harder, putting a strain on your HVAC system. This can result in higher energy bills, premature repair, or even system replacement. Always check the manufacturer's guidelines to identify what is the front and back of the filter.

The effectiveness of an air purifier is heavily dependent on its size. While portable air purifiers are best for single rooms or limited areas of the house, whole-house air purification systems are installed within the HVAC system to provide filtering for the entire indoor space. Discussing your needs with your installation company is the best way to determine what type and size of system your home requires. 

If you do not regularly change your HVAC filter, it will become clogged with dust, dirt, and other contaminants. This blockage forces the system to work harder to circulate air, leading to higher energy bills, poor temperature regulation, and increased wear on parts, which can cause more frequent breakdowns and shorten the system's overall lifespan. Additionally, a dirty filter that no longer traps contaminants can lead to poor indoor air quality, potential health problems, and even complete system failure.