1. I don't know whether I'm "good with schematics" or not...
2. I've attached a plan which you can use as base for a computer program.
If you are actually looking for a drawing of an electric circuit controling an airconditioner then this plan is worthless.
3. You have to use a clock for the loop.
EDIT: Please remove the "no" between and "temp>90". It is nonsense at this place.