I have a bobcat 843 and it originally did not have an enclosed cab but I installed lexan for the sides and added a door. The next year I did add a small heater that already had a 12 volt fan on it. I installed it between my feet which is nice as some cool air comes in there and it keeps the feet warmer. I ran 2 hoses back to the water pump and also installed a heater hose valve so I can completely shut off the flow for the summer time. I got this valve on ebay, and it was just an automotive valve. I wish the heater was a little bigger but it helps. I live in Canada and I purchased the heater at Princess Auto. Sorry no pictures.