How Does a Pool Heat Pump Work?

A heat pump is the air conditioner for your pool that can also work in the reverse mode. This device uses electricity to intake and transfer heat from one surface to another. 

This machine intakes natural heat from the air and supplies it into the water. It would work as an air conditioner for your swimming pool. This heat pump is the secret that gives you a warm and refreshing sensation while swimming and diving. 

If you’ve just got a new pool heat pump, it’s better if you know how does a pool heat pump work. These details will help you to control the device more efficiently.

How does a pool heat pump work?

A heat pump is the ultimate air conditioner to maintain your pool water temperature. But surprisingly, this machine works without producing any kind of heat.

The heat pump electric method captures the natural heat and extracts it into the pool water. The sunlight and natural heat transfer is the ultimate working method of pool heat. However, this device can also supply heat in cold weather.

Although a heat pump works with electricity, it’s a much more efficient and energy-saving method than any other pool heating method.

For this energy supply, it takes the help of a substance named refrigerant. When the air cycles through the system, this refrigerant undergoes pressure and temperature variations.  

Let’s give a check on the pool heat working process to learn more about this machine. It would be an essential part to know before buying the perfect pool heat pump. 

The technical working method of a heat pump:

Step 1: At the beginning of the heat pump method, the refrigerator stays in a very cold and low-pressure liquid, gaseous state.

This warm gaseous air gets supplied to room air. If you don’t know then, heat tends to move from warmer ambiance to colder ones. 

Step 2: Forgetting to transfer the air to the cooler refrigerant, heat follows its natural exertion.

And to facilitate the heat transfer in this pump, you’ll get tubes connected with an evaporator.

Also, this includes a fan that amplifies the heat absorption by increasing the room air.

Step 3: The transferred heat in the temperature gets warm by increasing the tool temperature.

This huge temperature movement happens as the refrigerant changes a large amount of liquid into gas. 

Step 4: Once you pass the gas through the evaporator, the cold liquid gets vaporized and warmed by the room air.

The evaporator compressor raises the gas pressure as well as its temperature.

Step 5: But the refrigerant alone can’t heat the water. That’s how the tool has a compressor to raise the pressure of the gas and its temperature.

Once the compressor makes it hot enough, the heat will automatically flow from the refrigerant to the water. 

Step 6: Also, the compressor forces nano high temperature and high-pressure gas into the other heat exchanger named a condenser.

The condenser is connected with the water and hot gas. This one works for giving up the heat to the colder water.

As heat leaves the gas refrigerant, the condenser cools off with its condensate point and makes it change from gaseous to the high-pressure liquid state. 

Step 7: In the end, the refrigerant passes through the valve’s pressure. And this makes the heat pressure and temperature reduced.

That’s how the refrigerant absorbs from the room air and repeats the entire cycle. 

These are the technical procedures that a pool heat pump follows.

Now that you know how the machine works, it will help you to understand how you should maintain the pump. With its unique working method, you’ll get to control the pool temperature both in the summer and winter seasons.

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How much will it cost to run a heat pump in a pool?

A heat pump is popular for its energy-efficient working method. However, you need to turn on the pump for 24 to 72 hours for proper heat supply in the pool. Thi snakes people worry about its costs. 

If you estimate the annual costs, it stands somewhere around $700 to $2400. The monthly heat pump running cost might be $120. This estimation is way too cheaper than gas-fired pool heaters. That’s how people consider it to be the most affordable way to heat your pool water. 

However, the cost will differ depending on some essential factors, such as the size and location of the pool. To cut off the cost, you should always go for a high-quality heat pump.

A cheap quality heat pump can cost more in the long run. Besides, the electricity bills, maintenance bill gets a lot more than a high-quality heat pump. A dysfunctional heat pump will create leakages, condensation, etc. 

Including all the extra costs of heating your pool, it will carry around 17% of your total household electricity cost. But the electricity bill will cover other efficient and essential factors of maintaining your pool. A pool pump can do filtration, water evaporation, chlorinators, etc. 

Regarding all these factors, a heat pump is a comparatively affordable option to choose for your pump. 

Should I run my heat pump during the day or at night?

Well, a heat pump works with passing natural heat to the water. By the working method and nature, it is suggested to run by the day time. This is how your heat pump will get to gather the sun’s heat and work more efficiently.

At night, you can turn it on, but it might not work efficiently as well as in the daytime. However, if you want your swimming pool in 85 degree Fahrenheit by morning, you can keep the pump running overnight. 

However, if you’re not willing to work on it during the day, go for the automotive heat pump. Herewith this type of pump, you can set the pump on and off the system every four hours. This will be on for four hours and off for another four hours automatically. 

Regarding all these, If you want efficient heat transfer, try to run your heat pump during the day. Running the pump in the daytime is more energy-efficient. Besides, the daytime gets heat absorption easier and saves your electricity bills. 

Frequently Asked Question

Why should you choose a pool heat pump over a gas heater?

The heat pump is a comparatively more efficient and effective device. This will save your electricity bill and include a longer lifespan than gas heaters. If you want to go smart and want something more reliable, choose a pool heat pump. 

How long should it take to heat a pool with a heat pump?

A heat pump takes 24 hours to 72 hours to heat your swimming pool. However, tiny pools like a spa can take around only 45 to 60 minutes. 

What temperature should I heat my pool on?

A heat pump works for getting the sparkling, warm ambiance to your pool water. You should set the heat pump around 78 to 82 degrees Fahrenheit. This temperature will make swimming more comfortable.


Heat pumps are the most efficient device to make your swimming more comfortable. Besides, these are much more comfortable and energy-efficient to work. Here I’ve mentioned how a pool heat pump works technically. So, it would help if you got your own high-quality heat pump for an ideal conditioned pool.

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