The Complete Guide to Changing Your Furnace Filter

The furnace filter is a simple part that plays a big role in your home’s heating and cooling system, changing your furnace filter is vital. It removes dirt, dust and other particles from the air before it enters your home. When the filter gets dirty, it can cause problems with airflow that result in higher energy bills and lower indoor air quality.

The best way to ensure your furnace filter is doing its job is by changing it regularly. Here’s what you need to know about how often you should replace your furnace filter and the dangers if you don’t change it.

When Should You Change Your Furnace Filters?

Changing your filter is one of the most important things you can do to keep your furnace running smoothly and efficiently. As a general rule, it’s best to change your filter once every three months. If you have pets or allergies, consider changing it more frequently.

A dirty furnace filter can cause many problems for your heating system. Not only does it reduce the efficiency of your furnace, but it also can increase the risk of fire in your home.

That’s why it’s so important to change your furnace filter regularly. And with so many different filters available, how do you know when yours needs to be replaced?

Here are some basic guidelines:

  • You should change your filter every month or more often if you have pets or allergies.
  • Depending on their design and construction, some filters must be replaced more frequently. Be sure to check with the manufacturer before buying new filters!
  • Check your filter size before purchasing new ones, so they fit properly into the slots in your furnace or air conditioner unit.

What Are the Dangers When You Don’t Replace Your Filter?

Have you ever wondered why your furnace filters are so important? If you’re like most homeowners, it is probably something you think about only occasionally. When it comes to your furnace filter, there are a lot of things that can go wrong if you don’t change it regularly. Here are just a few reasons why changing your filter is so important:

  • It Can Increase Energy Costs

When your furnace filter is dirty or clogged, this can cause your system to work harder than it needs to. This means it’ll use more energy than necessary and increase your monthly utility bills.

  • It Can Lead to Damage to Your Furnace

If you don’t change your filter regularly, it will start getting clogged up with dirt, dust and other particles. This will restrict airflow through the system, which can cause damage over time. Over time, this could lead to problems with parts like blowers and motors failing, which would require expensive repairs or replacements.

  • It Can Cause Health Issues for You and Your Family

When you have an old or dirty furnace filter in place, this puts everyone at risk of breathing in harmful pollutants such as mould spores and bacteria every time they turn on their heaters or air conditioners during the winter or summer. This can cause respiratory problems and other health issues, such as allergies and asthma, in those particularly susceptible.


Changing your furnace filter is a simple and inexpensive task that can help save you money on your heating and cooling bills. You should change your filter at least once each season or more often if you have pets or allergies in your home.

Maintain your furnace year round with Annual Maintenance Plans from Legacy Heating and Cooling. We’ll install a high-quality furnace filter, inspect your system and make any necessary repairs.

Contact us today for all your Filtration needs!

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