Heating, ventilation, and air conditioning (HVAC) units are one of the most essential systems in your home. It is responsible for keeping your home comfortable year-round, which can be a major inconvenience when it breaks down. 

If you are having trouble with your HVAC system, you may wonder what the most common reasons for HVAC service calls are. Here are seven of the most common reasons that homeowners call for HVAC service: 

1. Thermostat Problems  

If your thermostat isn’t working properly, it can cause a number of different issues with your HVAC system. For example, your system may not turn on when it should, or it may not be able to maintain a consistent temperature. If you suspect that your thermostat may be the problem, it’s a good idea to have it checked by a professional.

2. Refrigerant Leaks

Refrigerant helps to cool your home, and when there is a leak, it can cause your HVAC system not to work properly. Not only will your system not work as efficiently, but it can also lead to higher energy bills and even damage to your home.

If you suspect that there may be a refrigerant leak in your system, it is important to have it checked out by a professional as soon as possible.

3. Clogged Filters 

Your HVAC system has filters that help to remove dust and other particles from the air. If your air filter is clogged or dirty, it can restrict the airflow to your HVAC system, leading to several problems. 

For example, your system may not be able to achieve the desired temperature, or it may run for more extended periods than necessary in order to reach the desired temperature.

4. Dirty Coils

Your HVAC system has coils that help to cool the air. The coils are responsible for transferring heat; if they are dirty or damaged, they may not be able to do their job properly. This can lead to several problems, such as your system being unable to reach the desired temperature, or it may cause your energy bills to increase. 

If you think your coils may be the problem, it’s important to have them cleaned or replaced.

5. Frozen Evaporator Coils

The evaporator coils are responsible for absorbing heat from your home. If these coils are frozen, they won’t be able to do their job, causing your system to blow hot air. This is usually due to a lack of refrigerant. A professional will need to recharge your system with the proper amount of refrigerant.

6. Worn-Out Parts

As your HVAC system ages, it’s normal for some parts to start wearing out. This can cause your system to make strange noises, like banging, popping, or squealing. If you hear any of these noises, it’s important to have the worn-out parts replaced by a professional. Doing so will help keep your system running smoothly and efficiently for years to come.

7. Electrical Issues

HVAC systems are complex electrical systems, so it’s not surprising that electrical issues are a common cause of failure. Problems can range from loose wiring to faulty circuit boards and everything in between. If you suspect an electrical issue, it’s best to call in a professional for help.


In conclusion, There are many reasons why homeowners might call for HVAC service. The most common reasons include problems with the thermostat, the leaking of refrigerant, clogged filters, and dirty coils. Other reasons can include frozen evaporator coils, worn-out parts, and electrical issues. 

If you are experiencing any of these issues, it is best to call a professional HVAC technician to come and take a look. 

Suttner Cooling & Heating is a trusted HVAC company in Bradenton, FL. We offer a wide range of services, including AC installation, maintenance, and repair. Our goal is to keep your home or business comfortable all year round. No matter what your HVAC needs are, we can help. Contact us today to schedule a consultation. We look forward to serving you!