Pool Heater vs. Heat Pump: Which Is Right for Arizona?

If you want to swim year-round in Arizona, you need some form of pool heating. While Phoenix winters are mild compared to most of the country, pool water temperatures can drop into the mid-50s from November through February. That is too cold for comfortable swimming. The two most popular heating options are gas heaters and electric heat pumps, and each has distinct advantages depending on how you use your pool.

Gas Pool Heaters

Gas heaters burn natural gas or propane to heat pool water. They have been the standard pool heating option for decades.

• How they work: Pool water passes through a combustion chamber where burning gas heats it before returning to the pool. They can raise water temperature 20 or more degrees in just a few hours.
• Upfront cost: $2,000 to $4,000 installed.
• Operating cost: $200 to $500 per month if running frequently.
• Lifespan: 5 to 7 years in Arizona (heat and hard water shorten lifespan).
• Pros: Heats very fast, works in any weather or air temperature, lower upfront cost, ideal for on-demand heating.
• Cons: High operating cost, shorter lifespan, requires a gas line, produces emissions.
• Best for: Occasional heating (weekend use, parties), dedicated spa heating, pools that are not used daily.

Electric Heat Pumps

Heat pumps pull warmth from the ambient air and transfer it to your pool water. They work like an air conditioner in reverse.

• How they work: A fan pulls warm outdoor air across an evaporator coil containing refrigerant. The refrigerant absorbs the heat and a compressor concentrates it. The concentrated heat is then transferred to pool water through a heat exchanger.
• Upfront cost: $3,500 to $6,500 installed.
• Operating cost: $50 to $100 per month in Arizona.
• Lifespan: 10 to 15 years.
• Pros: Extremely energy efficient (3 to 5 times more efficient than gas), very low operating cost, long lifespan, perfect for the Arizona climate.
• Cons: Slower heating (raises temperature 1 to 2 degrees per hour), higher upfront cost, less effective when air temperatures drop below 50 degrees.
• Best for: Daily swimmers, maintaining a consistent temperature, year-round pool use in Arizona.

Learn more about our heater installation and repair services.

Why Heat Pumps Are Ideal for Arizona

Arizona's climate makes heat pumps an exceptionally good choice for pool heating. Here is why:

• Warm ambient air for most of the year. Phoenix's average winter low is 40 to 55 degrees, which is warm enough for heat pumps to operate efficiently 10 or more months per year. Only a handful of winter nights drop below the efficiency threshold.
• Dramatic energy savings. With Arizona's electricity rates, a heat pump costs a fraction of what a gas heater costs to operate. The monthly savings add up quickly.
• Fast ROI. A heat pump saves enough in operating costs to pay for the upfront price difference in 1 to 2 years. After that, every dollar saved is money in your pocket.
• Extended swim season. With a heat pump, you can extend your comfortable swim season from a typical March-through-October window to nearly year-round.

Can You Use Both?

Some homeowners install both a heat pump and a gas heater for maximum flexibility:

• Heat pump for daily maintenance heating. The heat pump keeps the pool at a comfortable base temperature efficiently and affordably.
• Gas heater for quick boosts. When you want to heat the spa quickly for an evening soak or boost the pool temperature for a weekend gathering, the gas heater provides fast heat on demand.
• Common in pools with attached spas. The heat pump maintains the pool temperature while the gas heater fires up the spa independently.

A dual system has a higher upfront cost but gives you the best of both worlds.

Solar Pool Heating

Solar heating is a third option worth considering, especially in Arizona:

• Operating cost: Free after installation.
• Upfront cost: $3,000 to $7,000 depending on roof space and system size.
• How it works: Pool water is pumped through solar panels (usually on your roof) where the sun heats it before returning to the pool.
• Pros: No operating cost, works exceptionally well in Arizona with 300+ days of sunshine, environmentally friendly.
• Cons: Depends entirely on sunlight, no heating at night or on cloudy days, requires adequate south-facing roof space.
• Best combination: Solar panels paired with a heat pump provide full coverage at the lowest possible operating cost.

Check out our equipment installation page for more information on heating system options.

Our Recommendation

After installing hundreds of pool heaters across the Phoenix metro area, here is what we recommend:

• For most Phoenix homeowners: An electric heat pump. It provides the best long-term value in our climate, with low operating costs and a long lifespan.
• For spa-only heating: A gas heater. It heats fast when you want it and does not need to run continuously.
• For maximum efficiency: A heat pump combined with solar panels. This gives you the lowest possible operating cost while still providing reliable heating.

Your pump and filter system also plays a role in heating efficiency, so make sure your circulation equipment is properly sized and functioning well.

Not sure which heating system is right for you? Call (702) 430-0972 for a free assessment from Sapphire Pool Solutions. We will evaluate your pool, your usage patterns, and your budget to recommend the best option. See our guide on pool costs in Phoenix for help budgeting your project.