.ctl-bullets-container { display: block; position: fixed; right: 0; height: 100%; z-index: 1049; font-weight: normal; height: 70vh; overflow-x: hidden; overflow-y: auto; margin: 15vh auto; }
Skip to content

Does a Heat Pump Need Freon In Winter


Heat pumps are becoming increasingly popular for their energy-efficient heating and cooling capabilities. However, there are still some misconceptions about their operation, particularly regarding the use of Freon, a common refrigerant. In this blog post, we’ll address the key questions surrounding heat pumps and Freon in winter, providing you with a better understanding of how they work and whether Freon is necessary.


Most homeowners are aware that heat pumps and air conditioners use refrigerants as part of their cooling process. However, people often ask whether heat pumps use Freon in winter. The answer is yes, your heat pump still uses Freon or other refrigerants during winter. The following article explains how heat pumps provide heating for your home and how Freon help them work.


What is Freon?

Freon, also known as R-22 or HCFC-22, are refrigerants used in heat pumps to transfer heat from one area to another. Freon are also used in air conditioners and refrigerators. This type of refrigerant is primarily found in older heat pump units as Freon have been phased out due to their harmful impact on the ozone layer under the Montreal Protocol. For units manufactured since January 1, 2010, Freon and other environmentally friendly refrigerants are the preferred choice. Freon are still available in limited supply for repairing old heat pumps and air conditioners.


How Do Heat Pumps Work?

Before we delve into the role of Freon in a heat pump, let’s briefly understand how these systems function. Heat pumps use a refrigeration cycle to transfer heat from one place to another. They can extract heat from the outdoor air, even in cold temperatures, and transfer it inside to warm your home. In summer, the process reverses to cool your living space.


What should I do if my heat pump refrigerant is leaking?

Refrigerant is not like oil in a car. You don’t need to regularly top up the refrigerant. It continuously circulates through your heating and cooling system, absorbing heat from indoors and outdoors. However, if you notice sudden issues with your heat pump and it fails to make your home comfortable, you may be dealing with a refrigerant leak.


Only certified heating and cooling technicians should handle refrigerants. If you discover a refrigerant leak in your heat pump, call professional specialists immediately. They will be able to inspect the refrigerant levels in your heat pump and repair the leak. This can restore the refrigerant flow in your heat pump and keep your home comfortable throughout every season.


Does a Heat Pump Use Refrigerant in the Winter?

Yes, heat pumps do utilize refrigerant during the winter months. Refrigerant, such as Freon, is an essential component of a heat pump system. It circulates between the outdoor and indoor units, absorbing heat from the outdoor air and releasing it indoors. The refrigerant acts as a medium to carry thermal energy, facilitating the heat transfer process.


Will a Heat Pump Heat Without Freon?

No, a heat pump cannot effectively heat your home without refrigerant, including Freon. Refrigerant plays a crucial role in the heat transfer process by absorbing heat from the outdoor air and transferring it indoors. Without refrigerant, the heat pump would not be able to extract heat from the outside and provide warmth inside your home.


Do All Heat Pumps Use Freon?

While Freon (also known as R-22) used to be a common refrigerant, it has been phased out due to its environmental impact on the ozone layer. Modern heat pumps now utilize more environmentally friendly refrigerants, such as R-410A or R-32. These alternatives are more energy-efficient and have a lower impact on the environment. Therefore, it’s important to note that not all heat pumps use Freon today.


How Often Does a Heat Pump Need Freon?

Under normal circumstances, a well-maintained heat pump should not require regular recharging of refrigerant. Heat pumps are designed to operate with a fixed amount of refrigerant, known as a charge, and should not experience leaks or require additional Freon during their lifespan. If your heat pump is experiencing a refrigerant leak, it’s crucial to have it inspected and repaired by a qualified HVAC professional.


Types of Refrigerants Used in Heat Pumps

There are three main types of refrigerants used in heat pumps. While one form of refrigerant has been gradually phased out in the United States, understanding the other two forms can help you understand what your heat pump needs to function properly. The three main types of refrigerants include:


R12 is a refrigerant known as chlorofluorocarbon (CFC). R12 and some other CFCs were found to contribute to greenhouse gas effects and climate change, leading to its phaseout in 1994.


After the discontinuation of R12, another refrigerant, R22, was widely used in the air conditioning and heat pump industry nationwide. Unfortunately, R22 was also found to be harmful to the environment and was phased out in 2020.


Although the Clean Air Act Amendments prohibit the import or manufacture of R22 in the United States, your heat pump or air conditioning unit may still contain this type of refrigerant. However, using HVAC units that operate on R22 is not illegal.


While using R22 units is not illegal, you may have difficulty finding this type of refrigerant when you need to replenish your heat pump in the future. Later, we will discuss how to transition your heat pump from R22 to a safer refrigerant.


The latest blend refrigerant is known as R410A or Puron. Puron has a smaller environmental impact in its formulation while still achieving its intended purpose. Puron heat pumps are more efficient and reliable than their R22 predecessors.


Can you switch your heat pump from R22 refrigerant to R410A Puron?

It is possible to convert your heat pump from R22 refrigerant to R410A Puron, but it is not as simple as replacing the old refrigerant with Puron. Unfortunately, the conversion is not as easy as a straightforward refrigerant replacement. To completely change the refrigerant, you would need to modify the entire heat pump system.


To retrofit a heat pump, you would need to invest in replacing the condenser, evaporator, compressor, and refrigerant piping. All these replacement components must be designed to work with R410A. Once all these upgrade parts are installed, you will be able to operate the heat pump on Puron.


While it is possible to convert your heat pump to be compatible with Puron, installing a brand-new heat pump may be more cost-effective. Please contact your local HVAC service provider to install a new heat pump that is compatible with Puron. They will be able to recommend and install equipment that suits your home and budget.


Advantages of Using a Heat Pump with Puron
While heat pumps using refrigerants can get the job done, you will eventually need to upgrade to refrigerants like Puron. When you do so, you can enjoy several benefits. After installing a new Puron-compatible heat pump, you will experience the following advantages:


Energy efficiency: Heating and cooling devices using Puron operate well under high pressure and consume less energy compared to heat pumps using Freon. This means you can save on your monthly utility bills.


Longer-lasting compressors: Puron cooling units use enhanced blended oil to lubricate the compressors. The oil they use helps the equipment run more efficiently and reduces the pressure on the compressor.


Lower risk of overheating: Due to Puron’s improved heat absorption and release efficiency, R410A heat pumps can operate at lower temperatures, reducing the likelihood of overheating and malfunctions.


Environmental friendliness: HVAC units using Puron are more efficient than those using Freon, which means they consume less energy and have a reduced impact on the planet. As mentioned earlier, Puron is also designed to minimize its environmental impact. Switching to a Puron heat pump can give you peace of mind knowing that you are doing your part to help save the Earth.

Air source heat pump installation

Why are Freon no longer used?

For decades, all air conditioners and heat pumps relied on R-22 refrigerant, branded as Freon. However, this started to change with the updated Clean Air Act by the United States Environmental Protection Agency in 1992. As part of the legislation, the government began developing a phased-out plan to eventually eliminate fluorocarbons.


Starting from 2010, all new air conditioners and heat pumps had to use less harmful refrigerants, with R-410A or Puron being the most common. This means that any equipment installed after January 1, 2010, does not use fluorocarbons. However, many older units still do.


Although Freon are no longer used in new equipment after 2010, the phase-out is still gradual and has taken over a decade. During this period, Freon could still be produced and imported into the United States. The U.S. implemented a complete ban on the production and import of Freon for HVAC units starting in early 2020.


Freon can still be legally recharged for old equipment. Since their production is prohibited, any Freon used must be recovered and recycled from other sources. The inability to produce Freon means the supply is limited, leading to skyrocketing prices. Therefore, we strongly recommend replacing old heat pumps or air conditioners that still use Freon. After all, the average lifespan of most heat pumps is around 15 years, which means any device still using Freon may need to be replaced soon.


The reason for the ban on Freon is to prevent further damage to the ozone layer. Fluorocarbons are compounds known as hydrochlorofluorocarbons (HCFCs) and are among the most potent ozone-depleting chemicals known to humans. As part of the Montreal Protocol in 1987, the United States and all other countries on Earth committed to phasing out the use of Freon and all HCFCs to prevent further ozone depletion.


R-410A and other refrigerants belong to a class of compounds called hydrofluorocarbons (HFCs). While these compounds are still highly efficient in transferring heat, they do not possess any ozone-depleting properties. However, R-410A is still a potent greenhouse gas, directly contributing to climate change. For this reason, the EPA has also announced plans to gradually phase out R-410A, similar to the phase-out of Freon.


This phase-out plan will begin on January 1, 2023. From that time onwards, all new heat pumps and air conditioners will no longer be able to use R-410A and must use other less harmful refrigerants. Like the phase-out of Freon, this process is planned to take 10 years, and the production and import of R-410A will be prohibited in the United States starting from 2033.


How does refrigerant work in a heat pump?

Whether it’s Freon, R-410A, or any other refrigerant, their operation principle is the same. The purpose of refrigerant is to absorb heat from the air and transfer it to another location inside or outside the building.


During cooling, the operation of a heat pump is similar to other air conditioners. The process begins by conveying the refrigerant to the compressor. The compression of the refrigerant reduces its pressure and transforms it from a gas into a liquid. This process also causes the refrigerant to become extremely cold. Then, the heat pump transports this chilled refrigerant through copper tubing to the evaporator coil inside the building.


The HVAC blower fan draws the warm air from inside the building through return ducts. This warm air circulates to the air handler where the evaporator coil is located. Since the refrigerant is colder than the air, the heat naturally transfers from the air to the refrigerant. Removing the heat cools the air, which is then circulated back into the building through supply vents.


This heat transfer process raises the temperature of the refrigerant, increasing its pressure and converting it back into a gas. The system continues to work in a cycle, with the cold refrigerant flowing to the evaporator coil and the hot gas refrigerant returning to the heat pump. The refrigerant then flows into the condenser coil, where most of the heat is dispersed back into the outside air. Finally, the refrigerant returns to the compressor, and this process continues until the system cools the house to the temperature set on the thermostat.


The difference between a heat pump and an air conditioner is that a heat pump can reverse the flow of refrigerant and the heat transfer process to provide heating in winter as well. The process works in the same way during heating, where the refrigerant is used to capture heat from the outdoor air and transfer it to the indoor air. The heat pump first compresses the refrigerant, making it much colder than the outdoor air temperature. This allows the heat energy from the outdoor air to flow into the refrigerant.


The refrigerant flows into coils in the heat pump, where it captures heat from the air. Once the refrigerant has absorbed enough heat, it passes through an expansion valve. This immediately lowers the pressure of the refrigerant, turning it back into a gas and further increasing its temperature.


The hot refrigerant is then pumped into the indoor coils within the air handler. The HVAC blower fan draws in the cool air and forces it to flow through the coils. Since the refrigerant is much hotter than the air, the heat naturally flows back from the refrigerant and heats the air. The heated air is then circulated throughout the house to raise the indoor temperature.


Signs that your heat pump needs refrigerant:


Signs that your heat pump may need refrigerant include:

Uneven temperature in your home: If you notice that certain areas or rooms in your home are not getting adequately cooled or heated, it could be a sign of low refrigerant levels. Insufficient refrigerant can impair the heat pump’s ability to transfer heat effectively.


Freezing of the outdoor refrigerant lines: If you observe ice or frost accumulation on the refrigerant lines of your heat pump, it may indicate a refrigerant leak. Reduced refrigerant levels can cause the coils to become too cold, leading to ice formation.


Water leakage around the indoor unit: A refrigerant leak can result in water leakage around the indoor unit of your heat pump. If you notice water pooling or dripping near the air handler, it’s essential to have it inspected by a professional technician.


Hissing or bubbling sounds: Unusual sounds coming from your heat pump, such as hissing or bubbling noises, can be indicative of a refrigerant leak. The escaping refrigerant may create these sounds as it leaks from the system.


If you notice any of these signs, it’s crucial to contact a qualified HVAC technician to assess your heat pump and check for refrigerant leaks. They will be able to diagnose the issue, repair the leak if necessary, and recharge the refrigerant to ensure your heat pump operates efficiently. Remember, only certified professionals should handle refrigerants, as they are hazardous substances and require proper handling and disposal procedures.



Heat pumps are highly efficient heating and cooling systems that rely on refrigerant to transfer heat. While Freon is commonly associated with heat pumps, modern units now use more environmentally friendly refrigerants. Whether it’s winter or any other season, a properly functioning heat pump requires refrigerant to effectively warm your home. If you suspect any issues with your heat pump, it’s advisable to consult an HVAC professional for a thorough inspection and any necessary repairs.

Looking for heat pump provider?

Shenling will be the best solution of how to use a heat pump in winter

Related posts

Related heat pump products

Get Quote