An integrated control system is being installed into a customer’s home. On the wall is a sophisticated looking thermostat with an LCD display. The customer would like to control the temperature via the integrated system. Which of the following would be the MOST important item to investigate?

A.
Whether the system is zoned.

B.
What type of system is being used (e.g. heat pump, gas, oil, etc.)

C.
Whether the thermostat can communicate with the integrated system.

D.
Whether the integrated system is heating, ventilating, and air conditioning (HVAC) compatible.