Thermal bridging of dryer duct?
I’ve had my heat pump dryer for almost a year now. It’s working really well and I’m satisfied with it. Last year when I installed it I stuffed the vent hood with fiberglass insulation to slow the air flow and heat loss. Now I’m curious, after reading articles here about the thermal bridging of steel studs, how much heat am I losing through the 4″ steel duct.
For that matter, has anyone considered how much heat is lost through frost free hose valves?