HVAC Parts That Are Cheap to Replace (and Costly to Ignore)!

Every heating and cooling system has parts that will eventually require replacement. When one or more parts of your HVAC system begin to wear out, it’s crucial to address the problem immediately. By doing HVAC maintenance regularly and replacing parts like air filters, you can avoid pricier repair services in the future and even extend the lifespan of your system. 

So, which parts of your HVAC system are cheap to replace and costly to ignore? Read on and find out:

HVAC systems are expensive, and ignoring even the cheapest repairs can cost you a lot of money in the long run. Here are some of the most common parts of your HVAC system that are cheap to replace and costly to ignore:

1. Filters

Filters are one of the most important parts of your HVAC system, and they’re also one of the cheapest to replace. Ignoring a clogged or dirty filter can lead to various problems, including decreased efficiency, increased energy costs, and shortened equipment life.

2. Thermostats

Thermostats are another important part of your HVAC system, and they’re also relatively cheap to replace. Ignoring a faulty thermostat can lead to inaccurate temperature control, which can be both uncomfortable and expensive.

3. Ductwork

Ductwork is another area that’s important to keep in good repair, as it can have a major impact on your HVAC system’s efficiency. Leaky ductwork can cause your system to work harder than it needs to, leading to increased energy costs.

4. Air Vents

Air vents are another part of your system that can be easily overlooked, but they’re important for keeping your home comfortable. Blocked air vents can cause your system to work harder than necessary, and they can also be a safety hazard.

5. Coils

Coils are an important part of your HVAC system, and they can be expensive to replace if they’re not properly maintained. Ignoring a dirty or damaged coil can lead to decreased efficiency and increased energy costs.

Taking the time to maintain your HVAC system properly can save you a lot of money in the long run. Neglecting even the cheapest repairs can end up costing you a lot more down the road.

What’s the Most Expensive AC Part to Replace?

The most expensive AC part to replace is typically the compressor. Compressors are responsible for circulating the refrigerant throughout the AC system, and they can be very expensive to replace if they fail. Other expensive AC parts include the condenser, evaporator, and expansion valve.

What’s the Most Expensive Furnace Part to Replace?

The most expensive furnace part to replace is typically the heat exchanger. This is because the heat exchanger is responsible for transferring heat from the combustion chamber to the air that is being circulated through the home. If the heat exchanger fails, it can be very costly to replace.

When a heat exchanger needs to be replaced, it is important to hire a qualified professional to prevent carbon monoxide from entering the home. If there is a heat exchanger crack, a professional HVAC technician will turn off the furnace and the gas in the home because it is a health hazard. Replacing a heat exchanger is a complex and labor-intensive process, and it is important to ensure that it is done correctly to avoid further damage to the furnace.


HVAC parts play a critical role in the overall efficiency and performance of your heating, ventilation, and air conditioning system. While it may seem like replacing parts can be expensive, there are actually many parts that are relatively inexpensive to replace and important not to ignore. The most common parts to replace include air filters, thermostats, vents, coils, and ductwork, all of which are relatively inexpensive and can help ensure the longevity and efficiency of your HVAC system. Ignoring these parts can lead to costly repairs, so it is important to get annual HVAC maintenance done. By taking the time to maintain your HVAC system, you can save money in the long run and ensure that your system runs efficiently and effectively.

Legacy Heating is a trusted company that offers various services, including air conditioner and furnace maintenance and repair. Get in touch with us to get a quote for the service you need!

HVAC Brands We're Proud to Carry

Legacy only uses the most efficient and cost-effective HVAC products. We pride ourselves on putting quality and customers first! We will equip your new home with the best HVAC system and offer the most reliable residential heating service in Edmonton and Calgary.

Contact Us Today

We’ll help you find the right heating and air conditioning system for you and your budget.

Edmonton Area 780-733-1256 Calgary Area 403-451-1337

Honesty, Integrity, Legacy