I did not add the AC either. They were out of the Houghton 9k Btu, which is the one I wanted. They were giving me the Dometic for $500 off, but I turned it down. I heard how horrible it was and did think it was worth it even at a $500 discount. I am planning on having it installed before summer at a local RV shop. The shop said it should be about $300-$400 USD to install since it's already prepped for it. The Houghton is about 1200 with the heat pump, so it is pretty close to what ETI was charging me.