First measure the size of the air conditioner, and then apply this to the tent and ripstop fabric with a marker. Use spray on glue or Beacon fabric glue to apply the re enforcing fabric to the outside of the tent. Once done with outside the ducting part of the project needs to be created by measuring the size of the air conditioner unit and leaving a few extra inches on that end for easy fitment. On the other end the duct will need to fit the size of the hole which has been reinforced already and the duct will be adhered to the inside of the tent (see diagram below).
The black is where the hole will be for the ac, the white is the duct which is cut out to fit to the tent. The tent is the gray part while the red will be a piece of fabric like on the outside to reinforce over the top of the duct connection point.
EDIT: After using the unit sticking the A/C unit so it was in the tent was better than having the connecting tube, better flow of air.