Pool Heating Cost Calculator

Heat gradually, not all at once

Running your heater continuously at full output stresses the heat exchanger and burns fuel at the worst efficiency point. Setting the thermostat to your target and letting it cycle on and off naturally is easier on equipment and uses fuel more efficiently than trying to heat the pool in a single day.

Use a solar cover every night

A pool loses most of its heat overnight through evaporation. A $40 solar blanket covering the surface cuts that loss by more than half. On a heated pool, covering every night can reduce monthly gas or electricity bills by 30–50%. It also reduces chemical evaporation.

Windbreaks matter more than you'd expect

Wind dramatically increases evaporative heat loss. A fence, hedge, or screen on the windward side of your pool can reduce heat loss almost as much as a cover. If your pool is exposed and heated, a windbreak is worth considering.

Lower the setpoint when the pool isn't in use

Dropping the thermostat 5°F when you're not using the pool for a few days saves a meaningful amount of fuel — the heater cycles less, and the lower temperature differential with the air reduces passive heat loss. Modern digital controllers make this easy to schedule.

Service the heater before the season starts

A dirty burner, corroded heat exchanger, or faulty thermostat all reduce efficiency without being obvious. An annual service visit costs $100–$150 and can recover 10–15% efficiency on an older unit. It also catches small problems before they become expensive repairs mid-season.

Balance water chemistry before heating

Unbalanced water attacks heat exchanger metals faster at higher temperatures. Low pH is especially corrosive. Check and adjust chemistry before firing up the heater at the start of the season — it extends the life of the most expensive component in the system.