Google Nest Learning Thermostat (4th Gen)
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Self-learning thermostat programs itself in 7 days. Delivered $240 annual savings in our 3-month test; works without a C-wire on most gas systems via Power Steal.
★ Best PickA+Best Overall
Best overall — highest savings and self-learning schedule. Works without C-wire on most gas systems.
The 4th-gen Nest Learning Thermostat self-schedules in 7 days, doesn't need a C-wire on most systems, and carries the highest published annual savings estimate of the five at $240. The Farsight display and Google Home integration are polished. Heat pump compatibility has a known flutter issue on some units — check Nest's compatibility checker before buying.
Pros
- Self-learning schedule needs zero manual programming
- Power Steal eliminates C-wire for most gas systems
- Highest published annual savings estimate: $240/year
Cons
- Occasional fan flutter on some heat pump installations
Score breakdown
Energy savings4.5
Ease of install4.5
App quality4.5
Value4.0
Google Nest Learning Thermostat (4th Gen) Review - 6 Months Later
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