Best for HVAC system compatibility depth
Google Nest Learning Thermostat 4th Gen
4.4 feature score
Highest scored product for this feature based on supporting review evidence.
Best Google Smart Home for HVAC system compatibility depth
HVAC system compatibility depth Decision Dashboard
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Reviewers saw broader system support as a plus, especially the expanded backplate compatibility noted against older Nest models.
Pros: temperature accuracy, Apple Home/HomeKit support
Cons: shared household access, touchscreen responsiveness