So in my quest to find a better way to heat my small poorly insulated gh, a local heating company suggested running water from a hose spout to a small unit with a heat exchanger in the gh, or getting a small hvac unit and running a gas line to it. The guy I spoke with said it would cost about $5000 to everything from scratch using standard sized products, unless I could find a small unit already made for such a small location. Can anyone recommend something like that?