Pool equipment comparison
Pool heater vs heat pump in Arizona, pick the right one, not the biggest one.
Every AZ pool builder will sell you a heater. Very few will explain when a heat pump is actually the better call. This page breaks down gas heater vs heat pump vs chiller vs solar for AZ conditions — install cost, operating cost, heating speed, spa use, and the realistic answer for how you actually use your pool.
The honest version: Most AZ homeowners over-buy on heating. If you swim May–Sep, you don't need a heater — the pool is naturally 85°F+. If you want Oct–Apr swim season, a heat pump costs a bit more upfront and pays for itself in 3 years on operating cost vs gas. A gas heater is right for a spa or a family that swims 4 months a year and wants fast recovery. Anyone selling you both without asking how you'll actually use the pool is upselling.
01
Gas heater — when it wins
- Spa use (needs fast recovery — heat pumps can't).
- Occasional pool heating on cold nights.
- Vacation homes with unpredictable use.
- Sport/therapy pools with fast temp change needs.
02
Heat pump — when it wins
- Extending pool season Oct–Apr for regular swimming.
- Maintaining comfortable temperature over months.
- Homeowners focused on operating cost.
- Homes with solar or lower electric rates.
03
Chiller — when it's worth it
- Summer pool comfort in Phoenix (pool sits 92–98°F Jun–Sep uncovered).
- Standalone chiller: $4,500–$8,500.
- Heat pump/chiller combo: $8,500–$13,000 (heats and cools).
- Drops pool temp 8–15°F below ambient.
04
Install cost comparison (2026 AZ)
- Gas heater (400k BTU): $3,500–$6,500 installed.
- Heat pump (125–140k BTU): $6,000–$10,000 installed.
- Heat pump/chiller combo: $8,500–$13,000 installed.
- Standalone chiller: $4,500–$8,500 installed.
- Solar heat panel array: $4,500–$9,500 installed.
05
Operating cost comparison (15,000-gal pool)
- Gas heater, heavy use: $150–$400/month.
- Heat pump, season extension: $60–$180/month.
- Chiller, summer cooling: $80–$150/month.
- Solar: near-zero after install.
06
AE build spec recommendations
- May–Sep only swimmer: skip the heater, spec a cover instead.
- Full-season swimmer, no spa: heat pump.
- Spa only, occasional pool: gas heater.
- Full luxury build: heat pump on pool + gas heater on spa + automation.
- Summer comfort in Phoenix: add chiller or spec heat-pump/chiller combo.
FAQ
Common questions.
Depends on how you use the pool. Gas heater: fast heating (raises 20°F in a few hours), higher operating cost, best for spa use and occasional pool heating on cold nights. Heat pump: slow, steady heating (raises pool 2–5°F/day depending on ambient temp), much cheaper to operate, best for extending pool season Oct–Apr. Many AZ luxury builds run both — heat pump for pool season extension, gas heater on the spa.
Natural gas heater (Pentair MasterTemp, Raypak, Jandy JXi): $3,500–$6,500 installed. Propane variant: similar. Heat pump (Pentair UltraTemp, Jandy AE-Ti, Hayward HP): $6,000–$10,000 installed. Heat pump with chiller (heat and cool): $8,500–$13,000 installed.
Gas heater raising a 15,000-gallon pool from 65°F to 85°F at AZ natural gas rates: ~$45–$75 per heat cycle, ~$150–$400/month if used heavily. Heat pump maintaining the same pool at 85°F Oct–Apr: ~$60–$180/month depending on ambient temps. Heat pump is ~60–80% cheaper per BTU delivered.
Gas heater (400,000 BTU) on 15,000-gallon pool: raises ~15–20°F in 8–10 hours. Heat pump on same pool: raises ~2–5°F per day when ambient is above 55°F. Heat pumps don't work efficiently below ~50°F ambient — output drops sharply. This is why heat pumps are for maintaining temperature over the season, not fast recovery.
Not practically. Heat pumps take 4–8 hours to raise spa temp; nobody's waiting that long. Spas use gas heaters (or dedicated spa electric heaters on very small spas). AZ luxury standard: heat pump on pool loop, gas heater on spa loop, both on automation.
Legitimate concern — Phoenix pools can hit 95°F+ in July/August. Chiller options: (1) dedicated pool chiller ($4,500–$8,500 installed), (2) heat pump with cooling mode ($8,500–$13,000 installed — heats Oct–Apr, cools Jun–Sep). Chillers drop pool temp 8–15°F below ambient. High-end AZ builds increasingly spec heat pump/chiller combos.
Solar can extend season for pool-only (not spa) use. Panel array typically 50–100% of pool surface area installed on roof. Install cost: $4,500–$9,500. Operating cost: near zero. Downside: aesthetic (roof panels), doesn't heat on-demand, needs enough south/west roof space, panel life ~10–15 years. Good complement to a heat pump; poor primary heat source for evening swimming.
Gas heater sizing rule of thumb: 400,000 BTU for 15,000–25,000 gallons, 350k for 10–15k, 200k for spa only. Heat pump sizing: 125,000–140,000 BTU for typical 15,000–25,000 gallon AZ pool. Undersized units run constantly and never quite hit setpoint — bigger is almost always the right call on new installs.
Yes, dramatically. Uncovered AZ pool loses ~70% of overnight heat to evaporation. A liquid solar cover cuts loss ~40%. A physical solar blanket cuts loss ~65–75%. An automatic in-deck cover cuts loss ~85%. Any pool with a heater or heat pump should have some form of nighttime cover for realistic operating cost.
For AZ homes that swim primarily May–Sep: no heater needed, water hits 85°F+ ambient. For homes that want Oct–Apr use: heat pump ($6k–$10k, low operating cost). For homes with a spa: add a gas heater for the spa loop. For year-round comfort including hot summers: heat pump/chiller combo. Every new build we quote spells out this decision line-by-line.
Spec your pool heating the right way.
Free equipment consult — we'll walk your use case and quote the right combination line-by-line.
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Why this is an investment, not a cost.
An AE backyard is engineered to add daily livability and long-term home value. We publish honest ranges and build to code with a licensed and bonded Arizona crew. AE provides project-specific workmanship and manufacturer-warranty information in the signed agreement. Website summaries are for planning only.
- Licensed, bonded & insured in Arizona. ROC 340966 (R-62) · ROC 341002 (R-3) · ROC 347738 (KA-5) · ROC 211530 (CR-21). Most Arizona contracting work valued at $1,000 or more — or requiring a permit — must be performed by a properly licensed contractor, subject to statutory exemptions. Verify the legal entity, license status, and classification with the Arizona Registrar of Contractors.
- Real ranges, itemized scope. You see materials, finishes, equipment models, and a line-item budget before you sign — not a one-line "pool — $90,000."
Related reading
Homeowner FAQ
More heating questions?
Every pool heating question we get lives in the Pool section of the Homeowner FAQ.