This may be slightly off topic for this forum, but here goes anyway: I've got one-inch copper supply and return lines running from my wood boiler to a heat exchanger on our gas-fired boiler. For about 20 feet (out of 100) the pipes run through a section of the basement up between the floor joists, a couple of inches from the subfloor. I'm getting to the point where I'm considering adding additional insulation to the system, and was wondering if it would make sense along this stretch. Currently they're not insulated at all, although other parts of the run are heavily insulated. Any radiant heat lost from these pipes is sucked up by the framing and eventually moves into a tile floor, which is nice. Would it be more efficient to keep the heat in the pipes at this point?