How Much Does a Variable Speed Pool Pump Save? Texas Energy Calculator
If you're running a single-speed pool pump in Arlington, TX, you're probably spending $80-100 per month on electricity just for the pump during summer. A variable-speed pump can cut that to $12-18 per month.
That's not a typo. The savings are that dramatic, and they come from a fundamental law of physics.
The Affinity Law (Why Slower = Way Cheaper)
Pool pump energy consumption follows the affinity law: power use is proportional to the cube of the speed. In plain English:
Cut the pump speed in half, and energy use drops by 87% — not 50%.
| Speed | Flow Rate | Power Use | Cost vs Full Speed |
|---|---|---|---|
| 3,450 RPM (full) | 70 GPM | 2,200 watts | 100% |
| 2,500 RPM | 50 GPM | 830 watts | 38% |
| 1,750 RPM | 35 GPM | 290 watts | 13% |
| 1,100 RPM | 22 GPM | 72 watts | 3% |
At 1,750 RPM — a common overnight circulation speed — the pump uses 87% less electricity than at full speed. And for most filtration needs, you don't need full speed. A pool that needs 8 hours of turnover at full speed can achieve the same turnover in 12-14 hours at reduced speed using far less total energy.
Texas Energy Cost Calculator
Here's the math for a typical 15,000-gallon Arlington pool using Oncor rates (~$0.12-0.14/kWh):
| Single-Speed Pump | Variable-Speed Pump | |
|---|---|---|
| Run time | 8 hrs/day at 3,450 RPM | 12 hrs/day at 1,750 RPM |
| Power use | 2,200 watts | 290 watts |
| Daily energy | 17.6 kWh | 3.5 kWh |
| Monthly cost (summer) | $80-100 | $12-18 |
| Annual cost | $700-1,000 | $100-200 |
Real-World Example: Arlington Customer
One of our customers in the Arlington Highlands area had a 1.5 HP single-speed pump running 8 hours a day. Their summer electric bills were hitting $350-400, and the pump was responsible for roughly 30-40% of that.
We installed a Pentair IntelliFlo VSF variable-speed pump. They now run it 12 hours a day at lower RPM. Their pump-related electricity cost dropped from ~$100/month to ~$25/month. That's $900/year in savings. The pump paid for itself in under 2 years.
What a Variable Speed Pump Costs
| Pump Model | Price Range | Best For |
|---|---|---|
| Pentair IntelliFlo VSF | $1,200-1,600 | Full automation, largest savings |
| Hayward Super Pump VS | $800-1,200 | Good value, solid performance |
| Pentair SuperFlo VS | $700-1,000 | Budget-friendly, simple setup |
| Jandy VS FloPro | $900-1,300 | Jandy automation compatible |
Installation runs $200-500 depending on plumbing. Total project: $1,000-2,100 for most Arlington pools.
Other Benefits Beyond Energy Savings
- Quieter. At 1,750 RPM the pump is barely audible. No more humming across the backyard.
- Better filtration. Slower water flow through the filter catches finer particles. Your water will actually be clearer.
- Less stress on equipment. Lower pressure means fewer leaks, less wear on plumbing and filter components.
- Automation ready. Variable-speed pumps integrate with smart pool controllers for scheduling and remote control.
When to Upgrade
Upgrade now if: Your pump is over 5 years old, making noise, or you're tired of high electric bills. The DOE mandate means single-speed replacements are going away anyway.
Wait if: Your pump is under 3 years old and running perfectly. But start budgeting — you'll want a variable-speed when this one dies.
Don't wait if: Your pump has already failed. There's no reason to install a new single-speed pump in 2026. It's illegal for new manufacture anyway under the DOE rules. Contact us for pump replacement service.
Want Us to Calculate Your Savings?
We offer free pump assessment. We'll check your current pump, measure your energy use, and tell you exactly how much you'd save with a variable-speed upgrade. No pressure, just honest numbers.
Call 682-399-2593 or get a free quote online.
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Project 36 Services — Family-owned pool service in Arlington, TX since 2005. Call 682-399-2593 for a free estimate.