Re: Air conditioning on Thundercraft 280 magnum.
Ulster...I used to have a Thundercraft 290 very similar to your 280, now we have a 340. We didn't have air in the 290 and I don't recall ever seeing it in one but 2 locations come to mind, under the seat at the dinette or in the cavity under the v berth. As waterone said, marine air conditioners are water cooled (except the carry on ones that sit over a hatch). The water pickup would normally be in the engine compartment (like the one for the head), then the water pump must be mounted very low (under the waterline) in order to work because they are not self priming. The marine units are normally built together in one package (have a look at some websites to see how they are designed/packaged) once the water goes through the unit it usually goes out a thru hull on the side. Something to keep in mind is that these units create condensation and where is that water going to drain to?, there have been many folks with wet carpets due to poor draining or even musty smelly areas under the floor. You really want to think this through carefully....good luck!
