Do you think I could replace this thermostat with an HAI

[SmithAtlanta]

This my current thermostat:
http://www.white-rodgers.com/pdfs/in.../0037-4046.pdf

I currently have a heat pump with a back up furnace in a 2 zone system and was looking to slowly convert my house over to this HAI thermostat:
http://www.hometech.com/modules/therm.html#HO-RC100

[Rupp]

Well I replace that exact tstat with an RCS TX15B a while back and it works perfectly. So I would assume if you get the right HAI then it should work.