Thermostat guide
ecobee Smart Thermostat Enhanced wiring guide
ecobee’s mid-range model with the same core wiring as the Premium (no accessory terminals). Power Extender Kit included.
What it supports
| Conventional systems | Up to 2 heat / 2 cool stages |
|---|---|
| Heat pumps | 2 compressor stages, 2 aux stages, no E terminal |
| Dual fuel | Supported |
| Dual transformer (Rh/Rc) | Supported |
| Power / C wire | Needs a C wire, or the included Power Extender Kit with 4 wires (R, W, Y, G). |
| Line voltage / millivolt | Not compatible |
Where your old wires go
| Old terminal | ecobee Enhanced terminal |
|---|---|
| R (single transformer) | Rc |
| Rh + Rc (dual transformer) | Rh |
| C (common) | C |
| W / W1 (heat) | W1 |
| W2 (2nd-stage heat) | W2 |
| AUX / W2 on a heat pump | W1 |
| E (emergency heat) | None |
| Y / Y1 (cool) | Y1 |
| Y2 (2nd-stage cool) | Y2 |
| G (fan) | G |
| O, B or O/B (reversing valve) | O/B |
| K (wire saver) | None |
| L / L/A (service light) | None |
B, X and K depend on your system. Use the tool to check. Confirm with the official guide.
What’s different about wiring the ecobee Enhanced
Wiring is the same as the ecobee Premium for heating, cooling and heat pumps: the same terminals, the same Power Extender Kit for systems without a C wire, and no E terminal.
The difference that matters for wiring is that the Enhanced has no accessory (ACC) terminals. If your old thermostat controls a humidifier, dehumidifier or ventilator, you’ll need the Premium or a separate control for that equipment.
Check the ecobee Enhanced price on Amazon
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ecobee Enhanced with common wiring setups
| Setup | Verdict |
|---|---|
| 2-Wire Thermostat (Heat Only) | Works with an adapter |
| 3-Wire Thermostat (Heat + Fan, No C Wire) | Works with an adapter |
| 4-Wire Thermostat Wiring (No C Wire) | Works with an adapter |
| 5-Wire Thermostat Wiring (With C Wire) | Works: direct swap |
| Cooling-Only Thermostat Wiring (AC + Fan) | Works: direct swap |
| 2-Stage Heat & 2-Stage Cool Thermostat Wiring | Works: direct swap |
| Heat Pump Thermostat Wiring (5 Wires, No C Wire) | Works with an adapter |
| Heat Pump Thermostat Wiring (6 Wires With C Wire) | Works: direct swap |
| Heat Pump Wiring With AUX and E (Emergency Heat) | Probably works: verify first |
| Heat Pump With a B Wire (Rheem / Ruud Style) | Works: direct swap |
| B Wire as Common (Trane / American Standard Style) | Works: direct swap |
| Rh and Rc Wires (Dual Transformer) Thermostat Wiring | Pro install recommended |
| K Terminal Wiring (Honeywell Wire Saver) | Pro install recommended |