Don't like the XR80 furnace. At very least go up to the XT80 furnace with high eff blower. HW Mdl 8321 thermostat. I assume you plan on keeping existing condenser on upstairs system.

Obviously the best furnace choice will be the XV80, Trane's two stage var speed 80% model. I would want the HW VP IAQ thermostat for the XV80 furnace.

For downstairs, your choice on the AC condenser. Stick with XR series, XR13, XR15, XR16 with best matching Trane evap coil, no third party coil.

Add a filter box cabinet to each system.

Of course each system correctly sized, not oversized.

IMO

This post was edited by tigerdunes on Tue, Dec 3, 13 at 7:26

Thanks tigerdunes.

Contractor did load calculations (Manual J). Also recommended adding an extra return grill as the existing return is not adequate.

I got a quote for XR16, which is cheaper than the 16XLi by about $2000.

Looking into the thermostats.

Nothing to look into.

For XT80, go with HW Mdl 8321, same as Trane 803.

If XV80 furnace for downstairs, then HW VP IAQ model.

Good Luck
IMO

Is there a Trane equivalent of the HW VP IAQ?

Also does the HW VP IAQ thermostat do the dehumidify on demand? Are anything additional required during install?

Yes, 900 series but will cost more than the HW VP IAQ...

IMO