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Maintaining your heating, ventilation and air conditioning (HVAC) system is crucial for ensuring optimal performance and energy efficiency, as well as prolonging the lifespan of your equipment. 

An HVAC maintenance checklist is an essential tool that helps you keep track of what needs to be done to keep your system running smoothly. Here are five key things to include on your HVAC maintenance checklist.

1. Change Air Filters

One of the most important things you can do to maintain your HVAC system is to change your air filters regularly. Dirty filters can cause your system to work harder and use more energy, which can lead to higher utility bills. Additionally, dirty filters can reduce the quality of the air in your home, leading to health issues for you and your family.

It’s recommended that you change your air filters every one to three months, depending on the type of filter you have and how often you run your HVAC system. If you have pets, allergies, or respiratory issues, you may need to change your filters more frequently.

2. Clean Coils

The coils in your HVAC system are responsible for transferring heat and cooling the air that flows through your system. Over time, these coils can become coated in dust and debris, which can reduce their efficiency and make your system work harder.

To maintain your coils, you’ll need to clean them periodically. This typically involves using a soft brush to remove any loose debris, followed by a special cleaning solution to remove any remaining dirt and grime. It’s best to have a professional perform this task, as they have the tools and expertise to clean your coils without damaging them.

3. Check Refrigerant Levels

Refrigerant is the substance that your HVAC system uses to cool the air in your home. If your system is low on refrigerant, it won’t be able to cool your air effectively, which can lead to higher energy bills and a less comfortable home.

To maintain your refrigerant levels, you’ll need to have your system inspected periodically by a professional. They’ll check your refrigerant levels and add more if necessary. It’s important to note that refrigerant is a controlled substance and should only be handled by licensed professionals.

4. Inspect Ductwork

Your HVAC system relies on a network of ducts to distribute the air throughout your home. Over time, these ducts can become damaged or clogged, which can reduce the efficiency of your system and lead to poor air quality.

To maintain your ductwork, you’ll need to have it inspected periodically by a professional. They’ll look for any signs of damage, such as holes or leaks, and check for any obstructions, such as dust or debris. If they find any issues, they’ll be able to repair or clean your ducts to restore optimal performance.

5. Test Thermostat

Your thermostat is responsible for controlling the temperature in your home, and a malfunctioning thermostat can lead to a less comfortable living environment and higher energy bills.

To maintain your thermostat, you’ll need to test it periodically to ensure it’s working properly. This typically involves setting your thermostat to a certain temperature and waiting to see if your HVAC system responds accordingly. If your system doesn’t turn on or off as expected, you may need to have your thermostat repaired or replaced.


Maintaining your HVAC system is essential for ensuring optimal performance and energy efficiency. By including these five key things on your HVAC maintenance checklist, you’ll be able to keep your system running smoothly and prolong its lifespan. Remember to have your system inspected and serviced by a professional at least once per year to catch any potential issues before they become more serious.

If you’re looking for a reliable HVAC maintenance service in Oshawa, Fortis Heating & Air Conditioning has you covered. We are dedicated to ensuring that your system is running smoothly and efficiently. Get in touch with us today to learn how.

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From Now until August 31/2024