A furnace filter is one of the most important components of your HVAC system. It traps dirt and other debris that could otherwise damage your furnace, cooling system and other appliances. Unfortunately, these filters need to be changed regularly to ensure optimal performance. Fortunately, changing your furnace filter is not difficult. Follow these instructions to learn how to change a furnace filter safely and efficiently.

Confirm the type of filter you need

There are many different types of filters for different types of HVAC systems. Before you begin changing your filter, you need to confirm which type you need. There are three common types of filters: air filters, oil filters and water filters. Air filters are used in HVAC systems that use forced air to distribute heat or cool air. Air filters trap dust, dirt, pet dander and other particles in the air to prevent them from entering your home. Oil filters are used in oil-fired heating systems and remove contaminants from the oil before it reaches your home. Finally, water filters are used in cooling systems that use water to remove contaminants and debris.

Locate the filter

Before you begin the installation process, you need to locate the filter. Furnace filters are typically located on or near the furnace, although some are mounted inside the ductwork. If you can’t find the filter, refer to the manufacturer’s instructions for more information on locating the filter.

Change your filter properly

There are several ways to change your filter, but the best option is to use an automatic filter change system. Automatic filter change systems are designed to protect you and your family from breathing in harmful contaminants. In addition to being the safest and most effective way to change your filter, an automatic filter change system is also the easiest and most efficient method. There are two types of automatic filter change systems: manual and timed.With a manual system, you need to remember to change your filter on a regular basis. Timed systems automatically change your filter at pre-determined intervals. If you use a manual system, it’s important to follow the manufacturer’s instructions for the correct filter change schedule. If you use a timed system, you can adjust the automatic filter change schedule to meet your needs.


Furnace filters are an important part of your HVAC system. They trap dirt and debris to protect the rest of your HVAC system. Unfortunately, these filters need to be changed regularly to ensure optimal performance. Follow these instructions to learn how to change a furnace filter safely and efficiently.

Frequently Asked Question

The furnace filter needs to be replaced depending on your location. For colder zones, you might want to change it every 30 – 60 days because furnaces usually go on for many months and do not take a break. For warmer areas, you may only replace it twice during the winter or after 90 days. It also varies on the thickness of the furnace filters. The thinner your filter, the more frequent you get to replace it.
If you fail to change your furnace filter, this might affect the performance of your furnace. It will pressure your equipment to work harder because of a decrease in airflow. Worse, it might damage your equipment forcing you to have it repaired or replaced. The furnace will overheat once you turn it on without a new air filter.
Technically without a furnace filter, your furnace will still operate. However, you will risk your family’s health and your equipment’s performance as well. Furnace filters make sure that contaminants, dust, and microbes do not get inside your house so you will not breathe dirty air.
A dirty furnace filter looks darker than the first time you bought it. The air also smells funny. You get lower airflow and your equipment works hard causing your electric bills to soar. Soon you will get sick, and develop headaches and allergies.
The fibers can’t do their job when it is placed backward. The furnace will work harder to keep up with its desired output. This will increase your energy cost and damage your equipment. Smaller particles will accumulate causing build-up.