By 2 stage on the stat, do they, perhaps, just mean a programmable
temp., or is it really that you need this type to control (properly) a
stage furnace such as the Trane gas, forced hot air furnace I will be
getting installed shortly.
Bob - Keep in mind Im not an HVAC guy, just another homeowner. But yes
- to answer your question - you most definately need a 2 stage stat.
It's not a setback. For a 2 stage furnace to work fully as designed,
the thermostat is the guy who needs to make the call as to wether or
not its time to bump up to stage 2.
Don't let the installers mislead you on this - on my furnace, and I
any other 2 stager, the jump to 2nd stage can be a timed event,
based upon dip switch settings.
For some reason, it seems to be very common for installers to put in a
2 stage furnace, and skip the stat, so I'd recc. you stress to the
installer you want the stat controlling the stages.