How Much Does It Cost to Run a Pool Heat Pump? (Explained)

Pool heat pump running cost typically falls between $100 and $300 per month, depending on where you live, how big your pool is, and how you use the system. That is a wide range, and it is not vague. Every dollar of that gap is explained by specific, controllable factors. The single biggest one, which most pool owners overlook, is whether they use a pool cover. A cover alone can reduce energy costs by 50% to 90%. This article breaks down what moves your costs up or down, gives you real numbers to work with, and shows you exactly where you can save.

How a Pool Heat Pump Actually Uses Electricity?

A pool heat pump does not generate heat. It moves heat from the surrounding air into your pool water. Think of it as a reverse air conditioner. It uses electricity to drive a compressor and fan, but most of the heat it delivers comes free from the ambient air.

That is why the efficiency numbers look unusual. COPs usually range from 3.0 to 7.0, which converts to an efficiency of 300% to 700%. That means for every unit of electricity used to run the compressor, you get 3 to 7 units of heat out of the heat pump. A gas heater, by contrast, has a COP of roughly 0.8 to 0.95, meaning you lose some of every dollar you spend to exhaust heat. That efficiency gap is the foundation of every cost comparison below.

Pool Heat Pump Running Cost Per Month: Real Numbers

The Hourly Cost

Heat pumps use about 5 kilowatts per 100,000 BTU per hour, and the median cost per kilowatt hour in the U.S. is around $0.15. That puts the average hourly cost to run a 100,000 BTU heat pump at about $0.75.

As of late 2024 and into 2025, the U.S. national average sits at $0.16 to $0.18 per kWh. If your pump runs an average of 4 to 6 hours per day during cooler shoulder months with a pool cover in use, you are looking at around $95 to $140 per month. That is a useful baseline for a mid-size residential pool in a moderate climate.

The Monthly and Annual Picture

A heated pool costs $50 to $150 per month using a heat pump, with operating costs depending on the climate, desired water temperature, utility rates, and heater size and type. In colder conditions, or with an uncovered pool, pool heat pump running cost can reach $100 to $300 per month in electricity. For comparison, the average cost to run a gas heater is $200 to $500 per month. Annually, heat pumps can save you anywhere from $950 to $4,800 per year in energy costs compared to gas or electric resistance pool heaters.

The Five Factors That Drive Pool Heat Pump Running Cost

1. Pool Size

The larger your pool, the harder your system has to work. If your pool has a heater, it will take more energy to heat the entirety of a larger pool. More water means more runtime to hit and hold your target temperature. Right-sizing your heat pump to your pool volume is the first step toward keeping costs predictable.

2. Ambient Air Temperature

Heat pumps are most efficient when heating outdoor air above 50 degrees Fahrenheit. Below that, efficiency starts to drop. The warmer the air, the harder your unit works for every dollar spent. If you live in a warm climate year-round, your bills will sit at the lower end of the range. Colder climates mean longer runtime and higher monthly costs, and outdoor temperature plays a bigger role in that than most people realize.

3. Your Target Water Temperature

Most swimmers are comfortable between 78°F and 82°F. Every degree you push above that comfort range adds meaningfully to your pool heat pump running cost over a full season. Setting the thermostat to 84°F instead of 80°F might feel like a small difference, but it compounds across months of use. If you have a heat pump, one of the simplest ways to lower your bill is to reduce the temperature setting on your pump.

4. Local Electricity Rates

The national average hovers around $0.16 to $0.18 per kWh. If you live in California, Massachusetts, or New York, you might be paying upwards of $0.30 to $0.35 per kWh. That nearly doubles your pool heat pump running cost compared to a lower-rate state. Pull out your last electricity bill, find your per-kWh rate, and use that figure rather than a national average when estimating your actual costs.

5. Whether You Use a Pool Cover

This is the biggest controllable variable by far. A pool cover stops the majority of surface evaporation, which is where most heat escapes. Investing in a pool cover helps contain heat without the need to keep running your pump. This can lower your monthly costs from an average of $200 per month down to $25 to $100 per month.

A solar blanket costs $50 to $400 and is a large plastic pool cover with built-in thermal bubbles that capture and retain heat while reducing evaporation. For most pool owners, it is one of the highest-return purchases available.

Pool Heat Pump Running Cost vs. Gas and Electric Heaters

For regular swimmers, the heat pump wins on running cost by a wide margin. Heat pump pool heaters cost more than gas pool heaters, but they typically have much lower annual operating costs because of their higher efficiencies. With proper maintenance, heat pump pool heaters typically last longer than gas pool heaters, so you save more money in the long run.

Gas heaters do have one genuine advantage: speed. They can raise water temperature in hours rather than the 24 to 72 hours a heat pump typically needs, which is why the two heater types suit very different pool ownership styles. Gas heaters are the most efficient option when heating the pool for short periods of time, making them ideal for homeowners who use the pool only on weekends or infrequently.

Lifespan also matters when comparing the total cost of ownership. The lifespan of a pool heat pump is 10 to 15 years, while the lifespan of a pool gas heater is roughly 5 years. That longer service life spreads the upfront cost further and adds to the long-term savings.

How to Reduce Your Pool Heat Pump Running Cost

These are the practical steps that actually move the number:

1. Use a pool cover every time the pool is not in use. A simple pool cover can reduce energy costs by 50% to 90%.

2. Set your target temperature to 78°F to 82°F. Every extra degree above that range adds to your monthly bill.

3. Run the heat pump during off-peak electricity hours when your utility charges lower rates, typically overnight or early morning.

4. Choose a higher-COP model when buying. Energy-efficient models with higher COP ratings lead to lower monthly energy bills, making them more economical over time.

5. Clean filters and evaporator coils regularly. A neglected unit works harder and longer to hit the same water temperature, pushing up your pool heat pump running cost unnecessarily.

6. Install the unit with proper clearance. Obstructed airflow forces the compressor to work against itself and can cause a measurable efficiency drop on every cycle.

The Real Cost Is Yours to Control

The pool heat pump running cost is not a fixed number. It is a range shaped by your climate, your pool, your habits, and the choices you make about equipment and maintenance. Heat pumps provide the most cost savings for homeowners who use the pool frequently. For most regular swimmers, a heat pump delivers the lowest ongoing heating bill of any option available, often paying back its cost advantage within two to three years. If you're ready to take the next step, our complete pool heater guide covers everything you need to choose confidently, or go straight to the pool heater range if you already know what you're looking for.