How do I figure out the optimal thermostat, temp, and staging settings for my house? I'd define "optimal" as the most efficient settings that give me adequate comfort. Sub-topic questions: It's generally said that the temp should be left constant in the house for the geo system to run most efficiently, but first off, is that even always true? If the system has no problem recovering from a setback, in a timely fashion, does that make a setback (for example, when we're at work and the house is empty) a good move? Even if the temp SHOULD always be left constant, that's not even straightforward when upstairs and downstairs are several degrees apart, and different areas are occupied through the day. I've got a two-stage system. If Stage 1 is slightly more efficient and produces better comfort, should I be trying to make the system run in stage 1 as much as possible? My system seems to run about 50/50 in stage 1/2 as it is set up by default. Should settings be fundamentally different between heating season and cooling season, or do all the same rules apply? I'm near Chicago, have an EcoBee 5 thermostat and a GeoComfort Navigator 5 ton water/air system. I know there are tons of variables here. I'm just looking to start the discussion, see where it goes, and learn something. Thanks in advance!