Next spring, I plan to replace my HVAC system: Furnace and AC. I have two zones which are controlled by ecobee3 thermostats. I’ve been generally happy with these thermostats, and I was hoping to keep using them with new system. However, I learned that the most efficient and green systems are now all controlled by proprietary communicating thermostats. For example: regular thermostat cannot control modulating furnace gas valve, and only is able to do two stages. The same for AC: no variable speed compressor control, only up-to two stages.
I found the following incompatible HVAC systems from various manufacturers:
- Carrier: Infinity
- Bryant: Evolution
- Amana, Goodman and Daikin: ComfortNet
- Trane and American Standard: ComfortLink II
- Rheem and Ruud: Comfort Control System
- Lennox: iComfort
- Maytag, Tappan, Westinghouse and others: iQ Drive
- Heil, Comfortmaker, Keep Rite and others: Observer
- Armstrong Air: Comfort Sync
- York: Affinity
- Luxaire: Acclimate
- Coleman: Echelon
I hate going to proprietary thermostats as it is a regression. There is also ClimateTalk standard, that supposed to solve the communicating thermostat problem, but I do not think anyone is actually using it (am I wrong?).
Which of the above standards work best with Home Assistant, should I just ignore the communicating systems, and buy less efficient two stage systems instead?