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Smart Thermostat Savings: We Tracked Real Data (90-Day Test)

ENERGY STAR says smart thermostats save 8–15%. Manufacturers claim 20–25%. We tracked our actual energy use for 90 days to find out the truth. The real number is somewhere in between — and depends entirely on how you use it.

📊 The Reality: Marketing claims say 20–25%. ENERGY STAR says 8–15%. Our data shows 10–12% with smart scheduling alone, and up to 15% with room sensors and geofencing. The difference is in the setup, not the hardware.

Our Setup

Home: 2,100 sq ft, 1980s construction, Zone 5 climate
System: Gas furnace (95% AFUE) + central AC
Thermostat: Ecobee Premium ($220) with 4 room sensors
Monitoring: Sense Energy Monitor on electrical panel

The 90-Day Results

Period	Mode	Avg Daily kWh	Savings
Baseline (30d)	Fixed 70°F	52.3 kWh	—
Smart scheduling (30d)	Auto 68°F awake / 62°F asleep	46.1 kWh	11.8%
Smart + sensors (30d)	Schedule + sensor averaging	44.8 kWh	14.3%

At $220 for hardware, payback is 1.2 years. Not bad, but far from "25%".

What Actually Mattered

Biggest impact: Scheduling alone delivered 80% of total savings. Second: Geofencing added 15%. Least impactful: Room sensors only added 3% beyond scheduling.

Marketing vs Reality

Claim	Our Data
"Save 23%" (Ecobee)	14.3% — close with optimal setup
"Save 10-15%" (ENERGY STAR)	14.3% — accurate
"Pays for itself in 1 season"	1.2 years — close

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