I'm shopping for a new 2 stage, variable speed furnace, and there is a 50/50 split in my quotes for installing a new thermostat vs keeping my current Honeywell (original to the home, 20yr olds, currently operating a 20yr old York).
Some quotes indicate that the furnace comes with a new thermostat.
Some say the original Honeywell is fine to control the new one.
Some have indicated that the Honeywell COULD do it, but it would be based on a timing algorithm, not on actual heating needs.
Some say after 20 years it should be replaced because it may just not function well after this long.
Thoughts on those statements?
Likewise, one particular model of furnace we're considering is: Carrier 59TP5A060E17-14 The rep claims that Carrier has 'Adaptive logic' technology, so it is actually the furance's motherboard that controls
when it needs to fire on low vs high. And because of that 'learning' technology, the original thermostat would be fine.