If you’ve ever had your air conditioner or heat pump serviced, you’ve likely heard the term refrigerant mentioned. But what is refrigerant, how does it work, and why is it important?
At John Lock Air Conditioning & Heating, we believe that homeowners benefit from understanding the basics of how their systems operate. In this article, we break down what you need to know about refrigerant and its role in keeping your home comfortable.
What Is Refrigerant?
Refrigerant is a chemical compound essential to the cooling process in your air conditioner or heat pump. It works by absorbing heat from the air inside your home and releasing it outside, allowing your system to maintain a cooler indoor temperature.
In short, without refrigerant, your air conditioning system wouldn’t be able to function.
How Does Refrigerant Work?
Refrigerant circulates through your HVAC system in a closed loop. Here’s a simple explanation of the process:
- The refrigerant absorbs heat from your indoor air through the evaporator coil.
- It is then compressed into a high-pressure gas, increasing its temperature.
- The hot refrigerant moves to the condenser coil outside, where it releases the absorbed heat into the outdoor air.
- As it cools, it becomes a liquid again and cycles back to repeat the process.
This continuous cycle is what enables your system to provide consistent cooling throughout your home.
Signs of Refrigerant Problems
Refrigerant should never “run out” under normal conditions. If levels are low, it’s usually a sign of a leak, which can lead to system inefficiency and even damage if left unaddressed.
Here are some common signs of a refrigerant issue:
- AC is blowing warm or insufficiently cool air
- Ice buildup on refrigerant lines or the evaporator coil
- Hissing or bubbling noises near the unit
- Higher than usual energy bills
- System running longer than normal to cool the space
If you notice any of these issues, it’s important to schedule a professional inspection promptly.
Why You Shouldn’t Just “Top Off” Refrigerant
While it may seem like adding more refrigerant is a quick fix, it’s not a true solution. Adding refrigerant without identifying and repairing a leak can lead to further damage and ongoing inefficiencies. Additionally, refrigerant must be handled by EPA-certified technicians, as improper handling can pose health and environmental risks.
At John Lock Air Conditioning & Heating, our licensed technicians are trained to detect leaks, make the necessary repairs, and recharge your system with the proper refrigerant type and amount.
Understanding Refrigerant Types
Older air conditioning systems may use R-22 (Freon), which has been phased out due to its environmental impact. Newer systems use more eco-friendly refrigerants like R-410A, which do not deplete the ozone layer. If your system still runs on R-22, consider upgrading to a newer unit. Not only will you be supporting environmental sustainability, but you’ll likely see improvements in system efficiency and energy costs.
Trust the Experts at John Lock Air Conditioning & Heating
Refrigerant plays a vital role in the performance of your HVAC system, and issues related to refrigerant should always be addressed by qualified professionals.
Whether you’re experiencing cooling issues or simply want peace of mind that your system is operating at peak performance, John Lock Air Conditioning & Heating is here to help.
Contact us today to schedule service or to learn more about your system’s refrigerant needs. 716.894.6400.


