Best Thermostats 2026
Check your existing wiring before buying. Smart thermostats highly prefer a 'C-wire' (Common wire) for continuous power, otherwise they must steal power or rely on disposable batteries.
Updated Apr 5, 2026
Check your existing wiring before buying. Smart thermostats highly prefer a 'C-wire' (Common wire) for continuous power, otherwise they must steal power or rely on disposable batteries.
Updated Apr 5, 2026
GE
GE Hotpoint Wall Thermostat with 2 Fan Speeds
RAK148H2
$45.99
The device itself costs pennies to power. The true 'cost' of a smart thermostat is the investment return; a properly programmed one saves 10-15% on annual HVAC costs.
Common Failure Modes
Smart thermostats can suffer from Wi-Fi chip failure or internal battery degradation. On older models, mechanical relays can stick, causing the AC or heat to run continuously.
Check your existing wiring before buying. Smart thermostats highly prefer a 'C-wire' (Common wire) for continuous power, otherwise they must steal power or rely on disposable batteries.
A thermostat typically lasts 10 to 15 years for programmable models and longer for simple mechanical models. Smart thermostats may have shorter lifespans of 5 to 10 years due to software obsolescence and battery degradation. Signs of end-of-life include unresponsive controls, incorrect temperature readings, the HVAC system not responding to setting changes, and Wi-Fi connectivity issues on smart models.
Top-rated thermostats brands include Google, ecobee, GE, Honeywell, Scotch and more. Covala Shopping tracks 17 thermostats from 6+ brands.
The device itself costs pennies to power. The true 'cost' of a smart thermostat is the investment return; a properly programmed one saves 10-15% on annual HVAC costs.
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