I have a portable A/C unit for the house for hurricane use when the power is out (runs off the generator).
I figured out early the exhaust vent hose needs to be insulated. It gets HOT!!!
Then I made an intake cover for the heat exchanger (condenser) and put an intake hose to the same window as the exhaust vent.
When you pull inside (room) air through the heat exchanger and expel it outside, outside (warm humid) air must come in to replace it reducing the overall efficiency. By having a separate intake from the window directly to the heat exchanger and back out the exhaust vent, you eliminate drawing outside air into the room.
This guy explains it really well.
https://youtu.be/_-mBeYC2KGc
Here's a good write up of an install of a portable AC unit with separate air intake and exhaust ports.
https://www.facebook.com/groups/sola...9689179848425/
Sorry Carl, please forgive the FB reference
