Independent testing
How much independent testing exists for each smart thermostat
Of the 8 smart thermostats we track, 3 have been physically measured by at least one independent lab. Below is every one, ordered by how much independent hands-on evidence stands behind it — densest first.
A coverage record, not a ranking of which is best.
| Product | Independent labs | Metrics measured | Outlets on record |
|---|---|---|---|
| ecobee Smart Thermostat Enhanced | 1 | 1 | 2 |
| Google Nest Learning Thermostat (4th Gen) | 1 | 1 | 3 |
| Sensi Touch 2 Smart Thermostat | 1 | 1 | 3 |
| Amazon Smart Thermostat | 0 | 0 | 3 |
| ecobee Smart Thermostat Essential | 0 | 0 | 1 |
| ecobee Smart Thermostat Premium | 0 | 0 | 3 |
| Google Nest Thermostat (2020) | 0 | 0 | 2 |
| Honeywell Home T9 Smart Thermostat | 0 | 0 | 2 |
Each figure is a count of what independent testers actually did — how we count. A low count means little independent evidence has been gathered yet, never that a product is worse. See also the Smart Thermostats buying guide and the reviewers we cite.