Air Conditioner size question 300 Weekender

Shay

Shay

Member
Oct 2, 2018
51
Marina Shores at Dune Harbor, Lake Michigan
Boat Info
1986 Sea Ray Weekender 300
Engines
twin 350 CID 260hp Inboards
I am adding AC and heat to my 300 Weekender before spring launch. I have tried to determine what size unit I need but I haven't found a straight forward answer. So for those here that have a 300 Weekender, what size is your AC unit? I am looking at a MarinAire self contained reversing AC/heat unit in 9000BTU or 11000BTU. Thanks for the help
 
Mine is a 10,000 and is original to the boat
 
I think 10k would work that is what was in my 280.
 
Where are you? South Florida vs northern MI might require different size. In addition to heating/cooling you might want to consider dehumidification.

Generally speaking if a unit is oversized, it will cool the area down before dehumidifying. A properly sized unit will also draw moisture out as it cools, but it will take longer, but you will be more comfortable.

Call the mfg and get their opinion, I would think they have an application specialist that would get you the right unit. The money is in the installation, so might as well get the unit you really want/need.
 
I had the 9000 in my 300 we.The water circulation pump went out the day before a 2 week trip and te outside temps were close to 100 while i hung upside down changing the pump under the dinette seat.I couldnt get the correct pump that day so went with a larger 250 gph unit,you could hang beef in there an hour later.I do agree with dehumidificaion it works great on our new boat with 16000 btu unit i installed.
 
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