I purchased a 28,000 BTU hot rod heater from Jegs and installed it facing forward just below the center of the rear passenger grab bar in my 2016 T4. Had some challenges finding the right size and shape heater hose off the engine, but it works well as a heater and defroster. Used foam pipe insulation wrap taped on with gaffer tape to the column to cut out airflow. Anyone that lives in colder parts of the country will tell you that heat your Teryx produces in the summer completely disappears when the temp drops below 40 degrees. I have the full tilt windshield full rear window/cover panel and full soft top doors and there are still lots of small air gaps. I used a pond liner under the factory hard cap to assist with those air gaps. Gaffer tape around the windshield, hard cap and soft doors. I am pretty good down into the teens (light jacket, gloves and hat). At single digit temps my 28,000 BTU heater has a hard time keeping things very warm and you need a good coat thicker gloves and you ears covered. Never an issue though on defrosting the inside of the front window, this setup works great for that. I need to seal around the doors and then I should be good into the single digits in a light jacket.
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