Staple the necessary phone cord across the ceiling and down to the Tstat that you glue to the wall. OK, no easy way to hide it if they did not include a control cord and where the other end is located. I would look at your current Tstat and IF it has a button labeled Zone (doubt it) then pull it off and see if there are two sets of control wires. Otherwise, suck it up and put in a non ducted unit. Instead of turning it off/on on the face of the new AC, turn it's breaker off if you cannot reach the controls.