Originally Posted by
syndicated
Do you have a 2 stage furnace and 2 stage A/C?
If not then you're fine, if you do, then your situation isn't ideal, as the furnace is timing 2nd stage heat based on demand. They might have wired your AC to run on high all the time as well.
Deal with the contractor, show him what you've found.
If you only have 4 wires to your stat then they'll either have to pull more wire which can be prohibitively difficult or change stat to a wireless option since 4 Isnt enough
IAQ only used 3 wires. IAQ 2.0 only uses 2.
If you payed for a 2 stage A/C, then you should get it.
As far as the furnace, there could be an arguement that you still have a 2-stage furnace using that thermostat.
"Better tell the sandman to stay away, because we're gonna be workin on this one all night."
"Dude, you need more than 2 wires to a condenser to run a 2 stage heatpump."
"Just get it done son."
Dad adjusted