Expert Verified Updated: March 2026

Uncovered Pool Heat Loss Cost Estimator

Calculate the financial penalty of leaving an electrically or gas heated pool uncovered on a cold night due to evaporative heat loss.

Quick Conclusion
Leaving a heated 16x32 pool uncovered on a 50°F night can cause massive heat loss requiring over 300,000 BTUs to reheat the next day, costing between $5 and $15 per single night in gas charges.

Technical Comparison

Heating MethodCost per Therm (100k BTU)Nightly Uncovered Loss Cost
Natural Gas~$1.50$5 - $10
Propane Tank~$3.50+$15 - $25
Heat Pump (Electric)~$0.80 Equivalent$3 - $6
Pool heating is the ultimate luxury, but without a cover, you are literally evaporating money into the atmosphere. Visualizing the nightly cash loss is the best way to motivate yourself to roll the cover out.

Actionable Steps

1. Determine your pool's surface area. 2. Figure out the temperature difference (e.g., Water is 85F, Night air is 60F = 25 Diff). 3. Look at your gas bill for cost per Therm. 4. Witness the financial destruction.

Pro-Tip

If you hate rolling up plastic bubble covers, look into 'Liquid Solar Covers' (fatty-alcohol chemicals). While not as good as a physical blanket, they reduce evaporation by up to 30%, which still saves significant money for little effort.

Frequently Asked Questions

Why does a pool lose heat at night?

The primary cause of pool heat loss is evaporation (about 70%), not radiation. As warm water meets cold, dry night air, it evaporates, drastically chilling the water left behind.

How much does a solar cover save?

A $150 solar cover stops 95% of evaporation immediately, effectively trapping the heat. It pays for itself in less than one month of gas heating savings.

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