As an HVAC expert, I am often asked about the frequency of changing furnace filters. It's a common question among homeowners who want to maintain a healthy central air system in their home. The answer is not as straightforward as one might think, as there are several factors that can affect the recommended interval for changing your furnace filter. First, let's talk about the different types of furnace filters. The most common ones are one-inch, three- to four-inch, and five- to six-inch coarse-grained filters.
According to industry standards, a one-inch furnace filter should be changed every one to three months, while 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 up to twelve months. However, these are just general guidelines and do not take into account filter sizes or types. For instance, if you have a thicker or smaller filter, the recommended interval may differ. That's why it is always recommended to never leave an air filter unreplaced for more than 90 days.
Fiberglass air filters are the more affordable option, but they are less efficient at capturing dust and particles from the air. As a result, they usually need to be changed every 30 days or less. But what about more expensive pleated air filters? These are known for their superior filtration capabilities and can last longer than fiberglass filters. In fact, the most expensive pleated air filters can get away with changing them up to every six months. However, this also depends on your lifestyle and the type of filter you choose. If you or anyone in your household suffers from allergies, it is recommended to change the furnace filter every 30 to 60 days.
This will help to keep allergy sufferers as comfortable as possible. Additionally, filters with higher MERV values are denser, which means your furnace has to work harder to pass air through them. Not all furnaces are powerful enough to do so, so it's important to consider this when choosing a filter. For those living in colder climates where the furnace is constantly running, it may be necessary to change the filter every 30 to 60 days. This is because more air passes through the filter, causing it to clog more quickly.
A clogged filter not only affects the air quality in your home, but it also forces the furnace to work harder, reducing its lifespan. But why is it so important to change your furnace filter regularly? Many homeowners are aware of the impact on air quality, but they may not realize that it also affects the efficiency and lifespan of their furnace. The furnace is responsible for introducing cold air and heating it before it reaches the rest of the house through the air purifier. A clogged filter can put unnecessary strain on the furnace, leading to potential breakdowns and costly repairs. Now, let's address the question of how often you should change your furnace filter. According to most air filter manufacturers and HVAC companies, you should change your air filter every 30 days when using less expensive fiberglass filters.
However, if you have young children at home or anyone with allergies, it's a good idea to use high-quality pleated air filters and change them every two months. It's important to note that every home is different, and despite general guidelines, you may need to change your furnace filter more frequently than your neighbor. This could be due to various factors such as the size of your home, number of occupants, and lifestyle habits. So, what's the bottom line? As an expert in the HVAC industry, I recommend changing your furnace filter every 30 to 60 days, depending on your specific circumstances. This will not only improve the air quality in your home but also help to maintain the efficiency and lifespan of your furnace. Remember, prevention is always better than cure when it comes to maintaining your central air system.
