Free Tool
Sleep Cooling Cost Calculator
Estimate how much lowering your thermostat at night actually costs — and how a staged curve compares to holding one cold temperature.
For your reference only — no live data is fetched.
Editable — used for the cooling load estimate.
U.S. average ≈ $0.16. Check your bill.
Cost of cooling to your proposed setting vs. your current setting
Per night
-$0.04
Range -$0.03 – -$0.05
Per month
-$1.22
Range -$0.85 – -$1.58
Per year
-$14.79
Range -$10.35 – -$19.22
Positive numbers mean the proposed (cooler) setting costs more to run. Negative means you'd save.
Flat cold vs. staged curve
Holding one cold temperature all night keeps the indoor–outdoor gap wide. A staged curve (68°F → 65°F mid-sleep → warmer near wake) reduces the average gap and saves energy while still cooling you during deep sleep.
Saved per night (curve)
$0.03
vs. flat cold
Saved per month
$0.81
Saved per year
$9.86
Assumptions
- Overall heat-transfer coefficient: ~108 BTU/hr per °F (estimated from sqft & home type)
- Cooling efficiency (COP): ~3 (≈ SEER 10–12)
- Electricity rate: $0.16/kWh · Outdoor temp: 72°F · 8 hrs/night
This is a simplified physics estimate. Real HVAC cost depends on insulation, duct losses, equipment age, humidity, and weather — none of which this tool measures. Treat the numbers as a rough directional guide, not a bill prediction.
Personalize it with your sleep data
CircadiaOS connects your wearable and thermostat to learn and automate your ideal overnight temperature.
FAQ
It's an approximation, not a utility bill prediction. HVAC cost depends heavily on insulation, equipment efficiency, ductwork, humidity, and home construction. The tool shows a sensitivity range (±30%) instead of false precision, and lists every assumption so you can judge it.
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