Product review (5 stars): Arrived on time. One thing to note.. ...
Arrived on time.  One thing to note...the original thermostat has the two connections on top an bottom.  This thermostat has the connection side by side.  Did some Google searches and found that since this is a closed circuit you can connect the blue and orange wires to either terminal.  Mine has been installed for 2 weeks now and is working perfectly.