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| Specification | White-Rodgers 1F89EZ-0251 Easy Set Heat Pump Thermostat |
|---|---|
| Brand | White-Rodgers |
| Model | 1F89EZ-0251 |
| SKU | 907753 |
| Component role | Standalone |
| Lifecycle | Legacy |
| Building systems | Not specified |
| Requires | Not specified |
| C wire requirement | Optional with batteries; required for continuous backlight |
| Changeover modes | Manual |
| Contact ratings | 1.5 A per terminal; 2.5 A combined maximum |
| Dimensions | 3-3/4 in H × 4-3/4 in W × 1-1/2 in D |
| Fan modes | Auto; On |
| Heating and cooling stages | Heat pump: 2H/1C, including one auxiliary/emergency heat stage |
| Operating humidity | 90% RH maximum, non-condensing |
| Operating temperature | 32–105 °F |
| Power sources | Two AA alkaline batteries or 20–30 VAC hardwired power |
| Scheduling | Non-programmable; Home, Sleep and Away presets |
| Setpoint range | 45–90 °F |
| System modes | Heat; Emergency heat; Off; Cool |