How Much Does a Pool Pump Cost to Run?
A single-speed pool pump costs about $478 a season at the US average rate. A variable-speed pump does the same job for around $179. Here's the maths.
A single-speed pool pump running eight hours a day costs about $2.66 a day, or $478 over a 180-day season, at the US average rate of 18.44¢/kWh. In many Sun Belt households it is the single largest electrical load in the home — bigger than the air conditioner.
It is also the easiest large load to cut, because of one piece of physics that most pool owners are never told about.
- Per month
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- Per day used
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- kWh / year
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The cube law: why slower is dramatically cheaper
Centrifugal pumps follow the affinity laws. Flow rate scales linearly with motor speed, but power draw scales with the cube of speed.
Work it through. Halve the speed and you get:
- Half the flow, so you need twice the runtime to filter the same volume of water.
- One eighth the power draw (0.5³ = 0.125).
- Net energy for the same filtration job: 2 × ⅛ = one quarter.
Filtration is not a race. A pool needs its full volume turned over roughly once a day; nothing is gained by doing it quickly. This is why variable-speed pumps are not a marginal upgrade — they are a 60–75% cut.
Single-speed vs variable-speed, costed
| Appliance | Watts | Duty | kWh/yr | Cost/yr |
|---|---|---|---|---|
| Pool pump (single-speed) | 1,800 W | 100% | 2,592 | $478 |
| Pool pump (variable-speed) | 450 W | 100% | 972 | $179 |
| Pool heat pump | 5,000 W | 50% | 2,400 | $443 |
A variable-speed pump costs roughly $700–$1,200 installed and saves about $299 a year at the US average rate on these assumptions. That is a three-year payback — and closer to 18 months in California, where the same saving is worth $539 a year. Several states now require variable-speed pumps on new and replacement installations for exactly this reason.
Season cost by state
| State | Rate | Cost | vs US avg | |
|---|---|---|---|---|
| Idaho | 12.35¢ | $320 | −158 | below average |
| Texas | 16.44¢ | $426 | −51.8 | below average |
| Florida | 15.17¢ | $393 | −84.8 | below average |
| Ohio | 19.52¢ | $506 | +28.0 | near average |
| Pennsylvania | 21.55¢ | $559 | +80.6 | above average |
| New York | 29.93¢ | $776 | +298 | above average |
| California | 33.25¢ | $862 | +384 | above average |
| Hawaii | 52.00¢ | $1,348 | +870 | above average |
How long should a pool pump actually run?
The goal is one full turnover of the pool volume per day. Divide pool volume by pump flow rate:
Runtime (hours) = pool gallons ÷ pump flow (gallons per hour)
A 20,000-gallon pool with a pump moving 3,000 GPH needs about 6.7 hours at full speed. Most people run 8–12 hours out of caution, which is not wrong but is often more than needed.
- Run during off-peak hours if you are on a time-of-use rate. This alone can cut the cost 30–50% with no equipment change and no downside — the pool does not care when it is filtered.
- Cut runtime in cool weather. Algae growth slows sharply below 70°F water temperature. Shoulder-season runtime can often drop to 4–6 hours.
- Clean the skimmer and pump baskets. A restricted intake makes the motor work against resistance for less flow.
- Check for an oversized pump. A 2 HP pump on a small pool is extremely common and pure waste — it finishes the turnover in three hours and then keeps running.
Frequently asked questions
How much does it cost to run a pool pump 24 hours a day?
A 1,800 W single-speed pump running continuously uses 43.2 kWh a day — about $7.97 a day or $239 a month at 18.44¢/kWh. Almost no pool needs this; it is roughly three to four times the required turnover.
Is a variable-speed pool pump worth it?
In nearly all cases, yes. Typical saving is $250–$550 a year depending on your rate, against an installed cost of $700–$1,200. Payback is usually two to three years, and under two years in high-rate states.
Should I run my pool pump at night or during the day?
Run it at night if you are on a time-of-use electricity rate — off-peak power is often half the price. Filtration works equally well at any hour. The one argument for daytime running is that chlorine is consumed fastest in sunlight, so circulation while dosing helps distribution.
How many hours a day should a pool pump run?
Enough for one full turnover: pool volume divided by pump flow rate. That is typically 6–8 hours at full speed for a residential pool, or 10–14 hours on a variable-speed pump at low RPM — which costs far less despite the longer runtime.
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