Needs: -programmable (weekly is all I need) -autochangeover (who actually enjoys Heat/Cold/Off thermostats anyway) -this is a heat pump with heat strips. -the air handler seems to have a gradual start, ie it does not come on blasting away - it starts up so slowly you don't notice it starting. I don't think it is a two-stage unit. -wifi -optional battery but normal power would be 24v Shoot this one down. All I can find is a one-year warranty on it, ick.