I’m using a Dryer Vent with a galvanized 5 to 4 inch coupler I found on Amazon for 10 bucks. There are photos with temperature readings. The readings are after running for 5-10 minutes while the unit cycles on. The hose gets very warm, but so far I’ve not seen more than 120F while its running.
https://www.amazon.com/Honeywell-MN10CESWW-Portable-Conditioner-Dehumidifier/dp/B00B2BTAV6

