Help with maximizing efficiency of new heat pump system

[BaldLoonie]

Vision Pro IAQ and Prestige IAQ both will stage 15kw backup in 10 and 5 increments. So will Aprilaire 8910 which is similar and less money. But regular Vision Pro stats and most others will not.

[beenthere]

Spoke to honeywell this week and they advised me that do not have thermostat capable of staging my 5kw and 10 kw seperately. Although 54regcab suggestion is a simple wiring change, I would still like to bring on 5 kw as 2nd stage and 10 kw as 3rd stage. Guess Ill have to install outdoor stat or time delay for 10 kw. Unless someone has more input???
Thanks

Don't know who you talked to at Honeywell, but the TH8300 series, the IAQ, the HD all can control your aux heat staging. They have W2 and W3 terminals.

Download their install manuals and you'll see.

[beenthere]

Yes, 13 seer heat pump. Vision Pro TH8320u1008 (For example), programmed for 2 cool \ 3 heat heat pump works as follows as I understand it. 1st call for heat makes Y, 2nd call for heat makes Y2, 3rd call for heat makes aux. Although this could work, I would also have the potential to have 5 kw of heat on in the summer if y2 were to make a call for cooling and I had my 5 kw heater wired to Y2.

The IAQ can control 2 stages of heat pump, and 2 stages of aux heat.