Through-hull: Marine Air Conditioning Definition
The skin fitting that lets cooling water into the boat. Bronze or composite, below the heeled waterline.
Through-hull in a Boat Air Conditioning System
Air conditioning wants a dedicated one. Teeing into the engine intake is cheaper and starves one system or the other under way, and it adds a failure point below the waterline. If a quote does not name a new skin fitting and seacock, ask where the water is coming from.
Using Through-hull Specifications in Quotes and Manuals
Use this definition to understand a quote, manual or fault report—not as an instruction to modify the boat. Before buying, compare the wording against the current manufacturer documentation. For refrigerant, fixed 240 V wiring or below-waterline work, use the official licensing and standards sources and an appropriately qualified tradesperson.
Start with the complete system guide for context, or check the owner questions for plain-language answers. Technical information can change or be wrong; the disclaimer explains the limits.