Has the refrigerant level/pressure been checked? If it is too low evap coils commonly freeze up, esp. in humid areas.
The link is a complete how-to for my whole infrastructure, which spans multiple buildings, and sends all my sensor data to a central server (sitting next to my DSL modem at my house, no less).
I use Tor extensively, including my whole network topology. It allows me to create a cloud of my own machines, rather than depending on $CloudVendor. :) But everything is documented. Have at :D