if we have a 5 zone house do we need 5 ecobee3 for each zone?

ecobee3 Smart Wi-Fi Thermostat

ecobee3 Smart Wi-Fi Thermostat

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    I have a 2 Zone Arzel system for the 1st and 2nd floor. I have an Ecobee Smart Si on the 2nd floor and an Ecobee Smart on the first floor. Both are direct wired to the control panel in the basement. The control panel communicates wirelessly with my AirPort network for internet access with my iPhone or iPad. I'd like to use omelet with sensors but the means that I'd have to install an Ecobee 3 with remote sensors for each floor to replace my current Ecobee thermostats. That's about a $500 replacement. It's like trying to pull teeth to get a straight answer out of Ecobee support. Truly frustrating.