Hi there
There are many options you could use with the easy for your HVAC application. Most easy units have six relay outputs and plenty of digital inputs; try a 719-DA-RC.
Unfortunately you can only use a 0-10v analog signal with the easy. If you want to use an RTD or Thermocouple, you can use a signal converter. This will give you a 0-10v output to use directly with the easy. Try IMO for signal converters? Or alternatively use a sensor with a 0-10v output, there are lots on the market at very low prices.
I have used the easy for many HVAC applications and they perform excellent. I use the 800 series and the MFD. Works better than most leading BMS controllers and at half the cost.
Hope this is of some use.
Best regards,
Tommy