This will depend on the type of material and efficiency of the filter you select
It is important to switch your air filters regularly to keep your indoor air quality at its best. Also, by installing a new air filter, your AC unit will work more efficiently and lower your energy bills. How often you need to change your furnace or air conditioner filter will depend on the type of material and efficiency of the filter you select.
Fiberglass air filters are a low cost, disposable solution but need to be changed every 30 days or less.
Pleated air filters are also disposable but typically have better efficiency than fiberglass and can last longer – up to 90 days depending on the season.
Where you live and the time of year are also important factors that will impact frequency. According to Energy Star (www.energystar.gov), filters that would typically last 90 days should be changed every 30 days during peak summer and winter months. This is when HVAC systems are operating at max capacity and thus require maximum efficiency to continue running smoothly.
Things to Remember
Regular maintenance of your home’s cooling and heating system is essential to ensure it operates efficiently. Proper maintenance will keep good air quality in your home, increase the life span of your system, and consume less energy to help lower your bills.