Pool Heaters in Alpharetta

A heater can stretch Alpharetta's swim season into spring and fall. The two main choices are electric heat pumps and gas heaters.

This guide covers costs and trade-offs.

Published costs

Published 2026 estimates put pool heater installation at about $3,100 on average, typically $1,864–$4,351, with heat pump heaters at $2,500–$7,500 installed.

Heat pumps

Heat pumps move heat from air into the water. They are efficient in warm, humid weather, which suits Alpharetta's late spring and early fall, but they heat more slowly and lose output in cold air. They need a dedicated electrical circuit.

Gas heaters

Gas heaters heat quickly regardless of air temperature and suit spas and occasional use, but cost more to run. New gas lines add cost.

Covers

A pool cover reduces heat loss and evaporation and can cut heating costs significantly.

Permits

Electrical and gas work typically need permits and inspections; ask the City.

Operating costs and season length

In Alpharetta, a heat pump can comfortably extend swimming by several weeks at each end of the season in typical years, because nights are mild and humidity is high. Gas heaters can heat a pool or spa quickly for weekend use but cost more per hour to run. Solar heating is another option where roof or ground space allows. Ask installers to estimate operating costs for your pool size and target temperature, and to explain how a cover changes the numbers. Combine the heater choice with a variable-speed pump and timer settings to manage energy use across the season.

Sizing and placement

Heaters are sized by pool volume, surface area and desired temperature rise. Place equipment on a level pad with clearance for airflow and service, away from bedroom windows due to noise. Protect from leaf debris and freezing.

Operating cost by heater type

Angi's 2026 pool heater guide lists approximate monthly heating costs of $120–$200 for a heat pump, $200–$400 for natural gas, $200–$850 for propane and $175–$600 for electric resistance, and notes that heat pumps can save roughly $950–$4,800 a year compared with gas or electric resistance for frequent users. In Alpharetta, a heat pump suits most season-extension use, while gas suits spas and quick weekend heating.

Covers do the heavy lifting

The same guide says a pool cover can cut heating energy costs by 50% to 90% and a solar blanket by up to 75% in sunny areas. Because most heat is lost from the water surface overnight, covering the pool is usually the cheapest way to make any heater affordable to run.

Hookups and permits

Angi lists gas line hookups at $500–$2,000 and electrical circuits at $250–$2,100. New gas lines and many electrical connections need permits and inspections; ask the City which apply.

Solar heating in North Georgia

Angi lists solar pool heaters at $2,500–$9,500 installed with near-zero monthly operating cost, but notes they work best with consistent direct sun. Many Alpharetta lots are heavily shaded by mature hardwoods and pines, which limits solar collector output on roofs and ground racks. If you have an open, south-facing roof, solar can be a good fit for spring and fall warming; on wooded lots, a heat pump is usually more practical.

Sizing the heater

Angi's guide pairs pool volume with gas heater capacity, for example roughly 80,000–120,000 BTU for a 20,000-gallon pool, and warns that an undersized heater runs harder and wears out sooner. Heat pumps are sized differently but follow the same principle. Ask the installer to size for the earliest month you want to swim, not just for summer top-up heating.

Repair or replace an old heater

The same source suggests repairing heaters under about five years old and replacing units older than ten, especially if the repair costs approach the price of a new heater. Corrosion from unbalanced water is a common cause of early failure, so keep chemistry in range.

Where heaters fit on the pad

Heaters need clearance for airflow and exhaust, and gas units need proper venting distances from windows and doors. Heat pumps blow cool air and can be noisy; place them away from patios and bedroom windows and check HOA screening rules.

Seasonal timing

Angi suggests autumn can be a good time to buy a pool heater because pool companies are past their busy season. Installing before spring lets you test it before the first swim.

When comparing heater quotes, ask each installer to state the heater's rated output, the expected time to raise your pool's temperature by ten degrees in April conditions, the warranty on the heat exchanger, and whether the quote includes the pad, venting, gas or electrical work and a permit. Those details reveal real differences between bids. Ask for estimated monthly operating costs in writing for each option. Written estimates make it easier to compare running costs across fuels. Include fuel, electricity and maintenance in each estimate for a fair comparison.

Ask whether a pool cover could reduce the heater size needed, lowering upfront cost.

Published pool heating cost estimates

Sources: Angi: Pool resurfacing cost (2026); Angi: Saltwater pool conversion cost (2026); Angi: Pool removal cost (2026); Angi: Pool heater cost (2026). Figures are published national or regional estimates compiled by those sites, labeled as estimates; they are not quotes and not prices from any provider on this site. National published estimates; North Fulton access, slope and HOA requirements can move local prices.

Local rules and code references

• City of Alpharetta, Swimming Pool Permitting & Inspections Procedures (rev. 2026): the City's pool guide: permits required before construction (ISPSC §105.1), 4-foot construction safety barrier from the first day of excavation, permanent fence 5 to 6 feet high, no filling without permanent fencing (UDC §2.3.3.B), final inspection and Certificate of Completion before use (ISPSC §113.1).
• Georgia DCA, State Minimum Standard Codes: Georgia's adopted construction codes; the 2024 International Swimming Pool and Spa Code with Georgia amendments applies to residential pools.
• City of Alpharetta Unified Development Code (Municode): the City's zoning and development code, including fencing, setback and buffer rules referenced by the pool guide.
• City of Alpharetta Planning & Zoning: City department pages for zoning, setbacks, buffers and HOA-independent City review.

Code text and department procedures change; confirm current requirements with the jurisdiction before work starts.