I have an Ecobee 3 and a Keeprite two-stage gas furnace.
The furnace is currently configured to control its own staging system but I'm curious what would be the advantage of reconfiguring to have the Ecobee control the two stage system. Are there any obvious big tradeoffs?
The relevant facts I can think of are:
- Keeprite R&D knows more about its manufactured furnace performance profile than Ecobee
- Ecobee has sensors across the house and knows about incoming weather systems and upcoming heating requirement changes so it should theoretically be able to do a better job controlling the overall system
- I can't find evidence of Ecobee being this smart
Best Answer
Operation with better feedback from the thermostat should always give performance that is as good or better than operation without as much feedback. The obvious trade-off is that installing more stages of control may mean running extra wire which may not be easy to do.
If you have a two stage Ecobee3 and you can connect it to the furnace and set the furnace for two stage control, then that should be an improvement over the furnace controlling its own staging, which is usually just a timer that runs the furnace at stage 1 for awhile and then switches to stage 2 if that does not satisfy demand.
I do not know exactly which Keeprite model you have, but the self-control scheme for a single stage thermostat signal is probably similar no matter the model. Here is an excerpt from the Keeprite G9MXT installation guide:
The ultimate in precise control is a digital communicating thermostat if your furnace has that capability.