The trane XL14c has a variable speed blower and two-stage gas heat according to their website. What i'm not clear on is whether it has two-stage cooling? If not, does it still use the VS blower when cooling or just for heating? Also, can a Honeywell VisionPro IAQ t-stat control the different stages and the VS blower, or is it better to let the unit (Comfort-R) do it?

We just had the above equipment installed and I want to make sure the installer has everything set-up properly. As it is, the t-stat settings indicate single stage heat and cooling, so I assume it is set-up to have the unit control the stages and VS fan.