Should You Heat Your AZ Pool? (We Say Yes!)

Is a Pool Heater Worth it or Necessary in Arizona? Isn’t the Water Warm All Year Round? You’re a homeowner in Arizona, enjoying those perfect, sunny days, in the Fall or Spring, where the outside temperature is a comfortable 80-85°F. Naturally, you think, “Who needs to heat a pool here? The sun does the job for me.” It’s a common assumption. After all, Arizona is known for its scorching summers, so the idea of heating your pool might seem unnecessary.

But here’s where things get tricky. Just because the air feels warm doesn’t mean the pool water will feel the same. If you’ve ever dipped your toes into a pool when the weather seems perfect, only to feel a brisk chill in the water, you know exactly what I’m talking about.

At Shasta, we’ve been helping Arizona homeowners get the backyard oasis for over 50 years. And we’ve been asked this question countless times. So in this article, we’ll explore the difference between air and water temperatures, why an 85°F day might not mean a comfortable swim, and whether heating your pool is worth considering.

By the end of this article, you’ll walk away with a better understanding of pool heating and whether it’s the right choice for you in Arizona. We’ll also throw in some relatable examples to help make this decision a bit easier.

Why Your Pool Water Feels Colder Than the Arizona Air (Even on Warm Days)

Let’s clear up a common misconception: the outside air temperature and the pool water temperature are not the same. Many Arizona homeowners assume that if it’s warm outside, the pool will feel just as inviting. But here’s the reality — water holds onto heat differently than air, and an 85°F day doesn’t translate into 85°F pool water.

Imagine this: it’s a perfect Arizona day, about 85°F outside, the sun is shining, and you’re ready to dive into your backyard pool. But the second you touch that water, it feels more like a brisk wake-up call than a soothing escape. Why is that? Water, even at 80°F, can feel surprisingly cool compared to the warm air. It’s because our bodies lose heat 25 times faster in water than in air, water is 800 times more dense than air, so even temperatures that seem warm by air standards feel much cooler in water.

And here’s where the challenge arises. When the outside temperature is what you’d call “perfect,” the pool water is often too cold to swim in comfortably. Conversely, when the pool water is at an ideal swimming temperature (around 85°F or higher), the outside temperature may be pushing 110°F or more, which isn’t exactly the best for entertaining guests or lounging outside for long periods.

Even A 10-Degree Difference Can Make a Huge Impact

Here’s another thing to keep in mind: A few degrees in water temperature can make a world of difference in how comfortable a swim feels. Pool water that’s 75°F will feel downright cold to most swimmers, while 85°F is often considered the minimum for “pleasant” swimming. Anything under 80°F can feel like jumping into a cold lake, even on a warm day.

On top of that, Arizona nights tend to cool off quickly, especially in the spring and fall. This can cause the pool to lose the warmth it gained during the day, leading to that morning chill when you’re ready for your first swim.

How to Maintain the Right Pool Temperature

So, how do you make sure your pool is ready for swimming when the outside temperature seems perfect? Heating your pool is the most reliable way to ensure a consistent water temperature that matches your expectations.

Believe it or not, the type of cleaning system you choose will significantly affect how efficiently any of the heater options introduce the warm water into the pool. For example, a traditional pool vacuum, or return pool, will have the heater water introduced through returns that are typically 16 – 18 inches below the top of the surface of the water. This scenario could add a fair amount of time and cost in heating a pool to that perfect swim temperature. It’s essentially the equivalence of heating a pot of coffee from the top of the pot with a blow torch; the heated coffee, or pool water, might not make it to the bottom of the pot or pool.

In contrast, an in-ground cleaning system, also known as “pop-up heads”, will introduce the heated coffee…wait, heated pool water, from the bottom of the pool floor. Since heat naturally rises, the bottom to the top heating method is the most efficient on your tab and wallet.

Don’t let any of the heater options overwhelm you. There is a real peace of mind in knowing that a pool heater can be installed at any time in the swimming pool’s life…it can be done when the pool is first built or 20 years later when it’s time for a life-style upgrade.

Finding the Perfect Pool Heater for You: Breakdown of Solar, Electric, Gas, and Hybrid Systems

Solar Pool Heating

Solar heating is a commonly asked about option in Arizona, thanks to our abundance of sunny days. It uses the sun’s rays to warm the pool water in a series of pipes that are on the roof of your house, making it an eco-friendly and cost-effective choice. However, solar heaters depend entirely on the weather, so they might struggle to keep your pool warm on cloudy days or during cooler nights.

Electric Heat Pumps

Electric heat pumps are another great choice. They operate like an AC unit but in reverse by pulling in warm air from the environment and use it to heat your pool water. They work best when the outside temperature is above 50°F, which is ideal for Arizona’s mild winters. While not as fast as gas heaters, they’re efficient, more consistent than solar heaters and can maintain your pool at a comfortable temperature throughout the cooler months. Some upgraded heat pumps have the ability to cool the pool’s water temperature.

Gas Pool Heaters 

If you’re looking for speed, gas heaters are the way to go. They heat your pool quickly, so if you wake up on a perfect 85°F day and your pool water is still chilly, a gas heater can have the pool warmed up by the end of the day or evening. However, they do have higher operating costs, so they’re best used for occasional heating rather than daily use. Unlike a heat pump that you can turn on and leave on for days without significant concern about the utility bill, you would never want to do that with a gas heater. 

Hybrid Electric and Gas Pool Heaters

These systems combine the cost and long term heat benefits of electric heat pumps and gas heaters. The electric heat pump handles maintaining the day-to-day heating, keeping your pool warm and energy-efficient, while the gas heater kicks in when you need to boost the temperature just a few more degrees quickly, like on cooler days or when unexpected guests show up for a swim. It’s the best of both worlds — you get the efficiency of electric with the speed of gas, so you’re never stuck with cold water when you need it most.

When You Should Consider Heating Your Pool in Arizona

Arizona’s climate may seem like the perfect environment for a pool, but as we’ve learned, water and air temperatures don’t always line up. When it’s cool outside, the water can be too cold for comfort, and when the water finally warms up, it might be a bit too hot for outdoor entertaining.

If you’re looking for instant gratification, especially as it relates to owning a spa, then a gas heater is probably the best choice for you. Be mindful of a gas heater that, just like your home oven, when its done cooking or at the desired temperature, turn it off. If you don’t closely monitor the run time of a gas heater, you could receive a shocking gas bill. If you don’t have gas service to your neighborhood or home, there are gas heater units that can be converted to the use of propane.  A propane converted heater can take up more space in the yard because of the propane tank itself so be mindful of that and ask for the dimension requirements.

If you are just looking to squeeze every possible moment you can out of your swimming pool and are not worried about instant gratification heat, then an electric heat pump would be a great solution. An electric heat pump can be turned on and left on with little concern about receiving a shocking utility bill like you might with a gas heater. With any heater type, it is always wise to consider a solar cover, commonly referred to as a solar blanket, to reduce any utility bill and conserve the heat in the water.

At Shasta Pools, we understand the unique challenges of owning a pool in Arizona, and we’re here to help you find the best solution to fit your needs. After all, your pool should be a source of joy year-round — not just a summer escape.

Is a Pool Heater Worth It or Necessary in Arizona?

If you’re an Arizona homeowner with a pool, you’ve likely asked yourself whether a pool heater is a good investment or even necessary. Maybe you’ve experienced the frustration of stepping into water that’s far colder than you expected, especially during Arizona’s shoulder seasons—spring and fall—or on those cool desert evenings. You might love your pool during the summer but wish you could extend your swimming season into the cooler months. If any of these situations sound familiar, you’re not alone.

At Shasta Pools, we’ve been designing and installing pools for Arizona families for decades. One of the most frequent questions we get is: “Is a pool heater really necessary in Arizona?” It’s a fair question, given our scorching summer temperatures, but the answer isn’t as straightforward as you might think.

In this article, we’ll walk you through everything you need to know about pool heaters in Arizona. You’ll learn how the unique desert climate affects your pool, the types of heaters available, their costs, and whether adding a heater is worth the investment for your family. By the end, you’ll have the information you need to make an informed decision about whether a pool heater is right for your home.

How Does Arizona’s Climate Affect Pool Temperatures?

Arizona is known for its sweltering summers, but it’s also important to recognize the significant temperature swings between day and night, as well as the cooler months. During the summer, Arizona’s air temperature can easily exceed 100°F, which naturally warms the pool. However, outside of peak summer months, the temperature difference can be substantial. Even in early spring and late fall, daytime temperatures may be comfortable, but nighttime lows can drop significantly, leaving pool water colder than expected.

These fluctuations make Arizona’s climate both a blessing and a challenge when it comes to keeping your pool at a comfortable temperature year-round. Without a pool heater, you may only have a few months each year when your pool water is naturally warm enough to swim comfortably.

Let’s Clear Up a Common Misconception: Warm Air Doesn’t Always Mean Warm Water

Let’s clear up a common misconception: the outside air temperature and the pool water temperature are not the same. Many Arizona homeowners assume that if it’s warm outside, the pool will feel just as inviting. But here’s the reality — water holds onto heat differently than air, and an 85°F day doesn’t translate into 85°F pool water.

Imagine this: it’s a perfect Arizona day, about 85°F outside, the sun is shining, and you’re ready to dive into your backyard pool. But the second you touch that water, it feels more like a brisk wake-up call than a soothing escape. Why is that? Water, even at 80°F, can feel surprisingly cool compared to the warm air. It’s because our bodies lose heat 25 times faster in water than in air, and water is 800 times denser than air, so even temperatures that seem warm by air standards feel much cooler in water.

And here’s where the challenge arises. When the outside temperature is what you’d call “perfect,” the pool water is often too cold to swim in comfortably. Conversely, when the pool water is at an ideal swimming temperature (around 85°F or higher), the outside temperature may be pushing 110°F or more, which isn’t exactly the best for entertaining guests or lounging outside for long periods.

This is another reason why a pool heater can be a valuable investment in Arizona. It ensures your pool water stays comfortable when the air temperature alone isn’t enough to do the job, allowing you to enjoy your pool no matter what the thermometer says.

Why Would You Need a Pool Heater in Arizona?

One of the biggest reasons Arizona homeowners consider a pool heater is to extend the swimming season. While the summers may heat your pool water naturally, spring, fall, and winter in Arizona often bring cooler evenings and mild days that result in colder pool water.

For many homeowners, this can be a frustrating experience. You’ve invested in a beautiful backyard oasis, but without a heater, you’re only able to enjoy it during a few months each year. A pool heater can keep your water at an ideal swimming temperature (around 85°F), even during cooler months, allowing you to enjoy your pool in early spring, late fall, and possibly even throughout the winter.

On the flip side, Arizona’s summer days are often so hot that heating your pool isn’t necessary. The natural heat from the sun is more than sufficient to maintain a comfortable water temperature during the peak summer months.

What Types of Pool Heaters Are Available in Arizona?

If you’re considering adding a pool heater, it’s important to understand the different types available and how each one functions in Arizona’s unique climate.

• Gas Heaters: Gas heaters use natural gas or propane to heat your pool quickly, making them ideal for those who want to heat their pool on demand or for short periods. While gas heaters are effective, they can be costly to operate, especially if used frequently.
• Electric Heat Pumps: Heat pumps pull warmth from the surrounding air to heat the pool water. They are energy-efficient but work best when the outside air temperature is above 50°F. Arizona’s mild winters make heat pumps a popular choice, but they may not be as effective during the coldest nights.
• Solar Pool Heaters: Given Arizona’s abundance of sunshine, solar pool heaters are a cost-effective and eco-friendly option. Solar heaters use the sun’s energy to warm your pool, reducing operational costs. However, they can be slower to heat your pool and rely heavily on sunny days to be effective.

How Much Does It Cost to Install and Operate a Pool Heater in Arizona?

The cost of installing a pool heater varies depending on the type you choose, the size of your pool, and the complexity of the installation. Here’s a breakdown of typical costs:

• Gas Heaters: Installation costs can range from $2,000 to $5,000, depending on the size of the unit. Operational costs can be significant, with gas bills increasing by $200 to $400 per month if the heater is used frequently.
• Electric Heat Pumps: Installation costs for heat pumps typically range from $3,000 to $7,000. While they’re more expensive upfront, their monthly operational costs are lower than gas heaters, typically ranging from $100 to $300 depending on usage.
• Solar Pool Heaters: Solar heaters tend to have higher installation costs, ranging from $3,000 to $9,000. However, once installed, they require little to no ongoing operational costs, making them an attractive long-term investment.

How Does a Pool Heater Affect the Lifespan of Your Pool?

Pool heaters, particularly gas and electric models, require regular maintenance to ensure they run efficiently and don’t damage your pool’s system. Using a heater can put extra stress on your pool’s plumbing and filtration systems, but with proper care, the heater itself should last many years.

Solar heaters, on the other hand, have fewer moving parts and typically require less maintenance, but it’s important to ensure the solar panels are cleaned and functioning properly.

When Is a Pool Heater Worth the Investment in Arizona?

The decision to invest in a pool heater depends largely on how much use you want to get out of your pool and when you want to use it. Here are a few scenarios where a pool heater could be worth the investment:

• Families who swim year-round: If you or your family enjoy swimming throughout the year, a pool heater is essential. It allows you to use your pool during Arizona’s mild winters, as well as extend the season into spring and fall.
• Homeowners with spas: If your pool includes a spa, a heater is a must to keep the water at a comfortable temperature for relaxation year-round.
• Occasional use during cooler months: Even if you don’t swim year-round, a pool heater can extend your swimming season by several months, making it worth the investment for many Arizona homeowners.

Should I Get a Pool Heater?

At the end of the day, deciding whether a pool heater is worth it depends on your lifestyle and how much you plan to use your pool outside of Arizona’s hot summer months. Here are some key considerations to help you decide:

• If you want to swim year-round, or enjoy pool parties and family gatherings during the cooler months, then a pool heater is definitely worth the investment.
• If you have a spa as part of your pool setup, a heater is essential to keep your water warm and relaxing even when the air temperature drops.
• If you’re only interested in summer swimming, and you don’t mind your pool being a little too cool during spring or fall, a pool heater might not be necessary.

Which Pool Heater Should You Choose?

Once you decide to heat your pool, the next question you need to ask is whether to use a gas, solar or an electric heat pump pool heater. And really, it depends on a few different factors. Each one has pros and cons, from installation cost to long-term maintenance to how long they last.

Check out our article on everything you need to know about pool heaters to start your research. Once you learn a little about the options, you’ll want to contact an experienced Arizona pool builder and service company like Shasta to discuss which option is right for your pool, your budget and your needs. We’ll spend time checking out your pool, its environment and the kind of pool lifestyle you’re looking for before recommending and installing your pool heater.

One unexpected outcome of heating your Arizona pool? You’ll have the ultimate staycation backyard!

At Shasta Pools, we’ve helped countless Arizona homeowners make the right decision when it comes to heating their pools. Visit our partner site TS Pool Supply to see what heaters they have available and schedule a service appointment with our team today. Whether you’re looking for a gas, electric, or solar heater, we can guide you through the process to find the solution that best fits your needs and budget.