Most all of the later model Hunters in 35 to 36 feet have a water to air heat pump installed from the factory. You will need a genset to power it when not at a dock. I have a 2003, 356 with HVAC and a 5 KW Northern Lights generator. We don't leave the dock without the generator running and we have either heating or cooling whatever we need. My Northern Lights is installed in the port lazarette and has a custom sound shield. It burns about .25 to .3 gallons per hour, so 5 to 6 gallons in 24 hours. While cruising, we have run it as long as 100 hours continuously. It's been reported that some of these Northern Lights generators go 30,000 hours. I have just over 3000 hours on mine since 2003. My wife and I are of the school of thought to be comfortable while out on the boat, as well as have fun sailing. We have a tracking satellite TV antenna too. Because we are equipped for comfort, she likes the boat. We spend about 75 days a year on board. Others would prefer a more simplistic sailing experience and we are all for that if that is what someone wants, but you can have both if you want.