How Much Does a Solar Pool Cover Save You? Real Numbers from Real Pools

Heating, water, and chemicals — three places a pool cover puts money back. We walk the math for a 16-by-32 inground pool in Phoenix, Atlanta, and Cleveland, with actual energy and water rates.

Published April 2026 · Lux Pool field notes

If you've been pricing solar pool covers, you've probably seen savings figures all over the map. One site says you'll save 50%, another says 70%, a third pulls a number out of thin air and quotes "$1,000 a year." None of those are wrong, exactly — they're just talking about different pools, in different climates, with different fuel sources, and they're conflating three different kinds of savings into one number.

Here's the truth: a solar pool cover saves money in three separate ways, and each one depends on different variables. Once you separate them, the math gets straightforward and you can estimate your own savings without hand-waving.

The three buckets, separately

Bucket 1: Heat retention (the biggest one)

The biggest bill associated with most pools is heating — either with a gas heater, an electric heat pump, or just the slow loss of heat the sun put in for free. A pool loses heat in three ways: by water evaporating off the surface, by warm water radiating heat into cooler air, and by conduction into the cool ground. Of those three, evaporation accounts for somewhere between 70% and 75% of total heat loss in a typical residential pool. It's the dominant force.

A solar cover sits on the water and stops evaporation almost completely. It also adds a thin insulating air layer (the bubbles in the cover) between the water and the cold night sky, which slows radiative loss too. End result: about 50–70% reduction in heat loss when the cover is on the pool overnight.

Bucket 2: Water loss

Same evaporation process, but money is leaving the pool too. An uncovered residential pool in a warm, dry summer can evaporate 1,000 to 2,000 gallons per month. That water has to be replaced — and it's not just the water bill, it's the cost of re-balancing the chemistry every time fresh water dilutes what's there.

Bucket 3: Chemical cost

UV light eats chlorine. Direct sun on uncovered pool water can destroy as much as 90% of the free chlorine in two hours. That's why outdoor pools need cyanuric acid as a "stabilizer" — to protect chlorine from UV. With a cover on, you cut UV exposure dramatically when the pool isn't in use, which means chlorine lasts longer and you go through fewer tabs or less liquid sanitizer.

Now let's put real numbers on each bucket, for a real pool.

The example pool: 16 by 32 feet, inground, six-month season

This is a common American backyard pool size — about 17,000 gallons. We'll assume the season is May through October (six months), the pool is heated to 82°F, and the cover gets used overnight every night. Here's how the savings shake out across three different climates.

Phoenix, Arizona — hot, dry, sunny

Heating cost (uncovered, gas heater): Phoenix pools don't actually need much heat in summer — the sun does most of the work. A heat pump or gas heater might run for early mornings and the shoulder months. Typical seasonal cost: $400–600 uncovered. With a cover on overnight: $150–250. Heating savings: ~$250–350/season.

Water loss: Phoenix evaporation is brutal — up to 0.3 inches per day in peak summer. That's nearly 2,500 gallons per month from a 16×32 pool, uncovered. A cover cuts that by 95% during covered hours. Seasonal water + chemistry cost saved: ~$120–180.

Chemical cost: Reduced UV chlorine destruction saves roughly $80–140 in chlorine and stabilizer over the season.

Phoenix annual savings: ~$450–670.

Atlanta, Georgia — humid, warm, mixed sun

Heating cost (uncovered, gas heater): Atlanta pools want heat from May into late June and again in September–October. Typical seasonal cost: $700–1,100 uncovered. Covered: $250–450. Heating savings: ~$450–650/season.

Water loss: Lower evaporation than Phoenix (humidity helps), but still significant. Water + chemistry savings: ~$60–100.

Chemical cost: Atlanta's mixed sun still degrades chlorine. Savings: ~$60–110.

Atlanta annual savings: ~$570–860.

Cleveland, Ohio — short season, big heat differential

Heating cost (uncovered, gas heater): Cleveland pools fight cold nights all season. A gas heater can easily run $1,200–2,000 for an unheated pool to be enjoyable. With a cover on: $400–700. Heating savings: ~$800–1,300/season — the biggest bucket of all three cities.

Water loss: Lower evaporation overall. ~$40–70.

Chemical cost: ~$50–90.

Cleveland annual savings: ~$890–1,460.

What changes the math

The numbers above assume a cover that's actually used — on every night, off when you swim. The single biggest variable in your real-world savings is how often you actually put the cover on.

A 2017 Cal-Berkeley study on residential pool energy use found that homeowners with manual reels used their covers an average of 38% of the nights they "intended" to. Homeowners with motorized reels used them an average of 91% of intended nights. That's not a small difference. It's the difference between $300/year and $700/year in the same Atlanta pool.

Other variables:

• Heater type. Gas heaters are 70–85% efficient. Heat pumps are 300–500% efficient (they move heat rather than create it). Electric resistance heaters are about 100% efficient but eat power. Your savings scale with how expensive your fuel is.
• Setpoint temperature. Heating from 75°F to 82°F costs roughly twice as much as heating from 78°F to 82°F. A cover compounds the savings of any setpoint reduction.
• Wind exposure. Open, windy pool decks lose 25–40% more heat to evaporation than sheltered ones. Cover savings are bigger on windy sites.
• Pool color. Dark pool finishes absorb more solar gain by day, so they have more heat to lose at night. Cover savings are slightly larger on dark pools.

What about the cover itself?

A solar pool blanket costs $200–500 depending on size and thickness. It lasts three to five years on average — six or seven if you're careful about UV exposure when it's rolled up (which is what a reel cover or shade does for you). At $400 every four years, that's about $100/year amortized. Subtract from the savings above and you still net several hundred dollars annually.

The reel itself is a separate purchase. A motorized solar reel runs $1,500–3,000 for the production models. Compared to the savings, payback period:

• Phoenix: 3–5 years to break even on a $2,000 reel.
• Atlanta: 2.5–3.5 years.
• Cleveland: 1.5–2.5 years.

After that point the reel is paying you. And it's a piece of hardware that lasts a decade-plus when built well, so the long tail is several thousand dollars of savings.

The savings nobody talks about

The non-financial savings matter too. With a cover that gets used, you also get:

• A cleaner pool surface in the morning — fewer bugs, leaves, and pollen to skim.
• Less algae pressure (algae needs sun and warm water; a cover eliminates one of those).
• A slightly smaller "hot day" panic when a heat wave threatens your chlorine balance.
• Quieter equipment — your pump runs less because the water is doing fewer things wrong.

None of those show up in a savings calculator, but they're the reason longtime pool owners get attached to their covers. The pool is just easier to live with when it's covered when you're not using it.

How to estimate your own savings, quickly

If you want a fast back-of-envelope number for your own pool, multiply your last twelve months of pool-related spending (heating fuel, water, chemicals, opening/closing services) by 0.35. That's a reasonable mid-case estimate of what a consistently-used cover would have saved you. For colder climates, multiply by 0.45 instead.

Most people are surprised how high it comes out. A pool isn't a small line item, and a cover is one of the few pool upgrades that pays itself back instead of adding to the total.