I would not lead a hose or pipe from the engine room to the cockpit or below deck. You will pipe in heat but also all the noise from the Engine Room. It will work like a direct line for high and low frequency noise.
I am working on noise reduction on my boat now, and found wire chases leading from the engine room to the helm helm adding 5-8dB of noise. amazing noise reduction by filling around the cables with dense foam.
Vicem 58 Classic
New Haven, CT