Hello Jcl
I don't think two way feedback is needed here and I don't think that is how the air con remote works. I think all that is needed is for a text box that can be changed by a button. The text box would then simulate the LCD on the air con remote.
For example if I set the temperature to say 20c then at the same time as the signal is sent to the air con would it be possible to change the text in a box on the pronto to show the 20 degrees? The reason is if I set the temp using the Pronto and then come back some time later I have no way of determining the temp the air con is set to.

Regards

Phil