I recently had a 2-stage, variable speed Amana furnace installed... but they left the original (single-stage) thermostat. I'm now thinking that I'm not getting the advantages from the variable speed blower.. Can anyone suggest a thermostat for my installation?

Carrier or Bryant thermidistat # TSTATCCPRH01-B It's a good thermostat for the two speed systems and variable speed blower. The thermostat you use will make a difference with a two speed variable speed.