MERV 13 air filters are designed to last for three months, and experts recommend replacing them regularly to ensure that the air is kept clean, energy costs are reduced, and that the air conditioner is operating properly. However, if the filter is made of fiberglass, it should be changed every 30 days. Pleated filters, which are more expensive, can last up to six months. If you want good indoor air quality (IAQ), you need better filtration and that means a MERV-13 filter.
But these filters are more expensive, so changing them every 30 days isn't as cost-effective. For Merv 8, 11 and 13 filters, it is recommended to change the filter at least every 3 months; however, changing the filter every 2 months improves filtration and provides healthier, cleaner air in your home. No matter what air conditioning system you have, each unit needs a quality filter that is properly adjusted to keep indoor air quality clean and your unit operating at peak efficiency. If you live in a “smaller house”, your air conditioners and ovens must pump less air to achieve the same amount of temperature change, which could mean fewer filter changes.
Air filters are electronic devices used in homes, offices, or any enclosed space to regulate temperature, collect dirt and allergens, and control humidity. To obtain high MERV ratings and greater thickness, these filters easily require only two filter changes per year. But how often do you have to change the air filter? How often do you have to change the oven filter? Well, it depends on the type of filter, its thickness, the MERV rating and some special conditions. When you buy standard one-inch fiberglass filters for your HVAC system, the instructions on the package generally state that you should change them every 30 days.
A larger home generally requires more frequent filter changes because ovens and air conditioners must release more air for temperature fluctuations. On the other hand, if you use your air conditioning system almost constantly, you'll have to change the filter every few weeks (especially if you use fiberglass filters). Smaller rooms won't require much air pumping, which means a lower frequency of filter replacement. Replacing the air conditioning or heating system filter regularly makes the system work efficiently and maintains the air quality in your home. Simply put, if you have poor air quality outside and inside your home, you'll need to replace your air filter more often.
Air filters reduced indoor fine particle concentrations by 60%. Filtration was associated with a 9.4% increase (95% confidence interval, 0.9-18%) in the reactive hyperemia index and a 32.6% (4.4-60.9%) decrease in C-reactive protein.