LOL... if you are serious, the sensing bulb needs to sense air temp.. not condensate water temp.

Here is a PDF that explains about the cap tube and return air sensor.

http://www.dometic.com/FileOrganizer/1-international/marine/marineair/Manuals%20and%20Translated%20Info/Marine%20Air%20Manuals/Air%20Conditioning%20-%20Direct%20Expansion%20Systems/L-2200-CoolMate-Cuddy-dc-Install-Operation.pdf