How Long Does an AC Unit Filter Last?

Newer air conditioning systems typically use pleated filters, which are rectangular and have a depth of about one inch. Generally, it is recommended to replace them every 45 days for maximum efficiency, although if you don't have allergies, you can replace them every 90 days. It is important to use the correct size and type of air filter when replacing them. Most air filter manufacturers and HVAC companies suggest changing your air filter every 90 days or 3 months.

This may vary depending on the location of your home (e.g. dry and dusty climates), if you have pets, and the age of your system and equipment. If you have pets in your home, it is recommended to change the filter every 60 days or 2 months, and for households with multiple pets or people with allergies or respiratory conditions, it is best to change the filter every 20 to 45 days. Vacation homes or vacant homes that don't have much use can expect to change filters every 9-12 months.

The general consensus is that the more you use your home, the more often you need to change the air filter. Pleated air filters are more expensive at first, but they are also more efficient at trapping particles and can last up to 90 days, depending on use. For example, a one-inch oven filter should be changed every one to three months. A three- to four-inch filter can last six to nine months.

If you have a five- to six-inch coarse-grained filter, it can last nine to twelve months. By making sure your filters are changed when needed, you can enjoy a heating and cooling system that will perform better and have clean air that is easy to breathe. They are inserted in a specific location within the return air duct (usually a large pull-down ventilation in the hallway or other place in the house). Those who use their air conditioner or oven sparingly and only turn it on in the coldest or sweltering temperatures may not have to replace their air conditioner for six months or more.

But what happens if you let that time go by a little? Before we talk about WHEN you should change your air filter, let's start with the WHY. The HVAC air filter helps keep indoor air clean by trapping mold particles, pollen, and other contaminants moving through the system. Most ovens come equipped with a standard one inch filter, this filter can be found in the blower compartment of the oven. Not only is a filter an essential part of your HVAC system, but it's also extremely useful for pet owners, anyone with allergies, and people who enjoy using candles. The ideal is to change your air filter every three months; however, there are certain factors to consider when determining when to change an old filter. If higher efficiency is their goal, they can also install a cabinet that will connect to their oven, leaving room for upgraded (taller) MERV filters.

If you want to burn candles and have clean air, routinely changing the filter will be a smart choice. Air filters should be changed regularly in your home to keep the system running smoothly and maintain optimal air quality. The strongest filters are reusable, usually with metal frames, and can be cleaned according to the manufacturer's instructions. Some regions suffer more pollution and construction than others, so if you live near a city or a busy road, check your filters more often. Consider all factors discussed above to determine a replacement program and decide what type and quality of filter you should use.