We've replaced one of our 20 year old air con units with a 12,000 btu Webasto marine unit. Heats and cools. Works well. It was easy to install. Curiously, the "brand new" unit had a manufacturing date of May 2011. That's four years ago. The old units were made by Mermaid in the USA. I tried to contact them to see about replacments from them, but never got a reply. Tech Cooling in Perth is the Webasto marine dealer. They were very responsive as was the Webasto Australian distribution for Webasto. This unit is much smarter than the old one. When it comes on, it pauses, starts the water pump for the heat disapation, pauses, then starts the compressor. The fan and compressor are both variable speed units, so the digital sensors give input that the "brains" use to achieve the most efficient operation.
