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Air Conditioning

Posted: Sun Jan 11, 2015 10:12 am
by shelbygt
There's a roof hatch in the forward berth of my 30' M. I'm guessing it's a 14x14 opening which would be the right size for an A/C unit. Anyone use it for that? Would save from having to cut another hole in the hull.

Re: Air Conditioning

Posted: Sun Jan 11, 2015 8:43 pm
by barkleydave
You might find that an AC unit that would fit in the hatch... Cruise N Carry comes to mind is too small to do the job in most our Ms

If you are in a covered slip a small unit would help.

Most our Ms require a min. of 14K=16K btu units.


safe harbors,

dave

Re: Air Conditioning

Posted: Mon Jan 12, 2015 5:14 am
by MetalHead
I would not block that access/exit. I consider that an escape hatch as much as I do ventilation.

Re: Air Conditioning

Posted: Mon Jan 12, 2015 6:02 am
by Docsnow
Shelbygt,
If you are talking about the carry on from west Marine same your$$$'s or the likes, I tried it didn't work. On a partly cloudy day with temps @ 78 degrees & running for several hours sliding rear doors closed drapes closed front windshield covered I could hardly feel it sitting on the steps to the galley. I returned to West Marine :roll: BTW my BigM also had extra isolation that aluminum stuff with the plastic bubble in-between the foil. In my personal opinion they aren't worth the $$$ or the time :( As Dave B. said they do not have a big enough BTU out put :cry:

Norm'

BIG BigMs Live On :mrgreen: :D







Re: Air Conditioning

Posted: Mon Jan 12, 2015 7:17 am
by shelbygt
Yikes. I was thinking 8,000 btu would be plenty based on square footage. Kinda thinking about a portable at this point. I plan to enclose the aft deck in canvas so I t would be nice to have a/c or heat I can move around.

Re: Air Conditioning

Posted: Mon Jan 12, 2015 7:27 am
by bcassedy
8k BTU might get the interior reasonable on a cloudy day, but the great thing/bane of our Big M's is the glass. I made new curtains for mine with liner blocking material between the glass and the actual curtain material. That helps with keeping some of the solar radiation from heating the interior but it still gets "HOT" sitting in the uncovered slip on a sunny day. I have a single 16K BTU on the boat (Cruisaire) which feeds air thru insulated ductwork to the dressing area adjacent to the forward berth and into the salon area. If you're unsure, contact a heating and air conditioning company and ask them to do a load check for the boat. While they deal in homes, a boat such as ours shouldn't present too much of a problem to determine what size would be correct.

Bill

Re: Air Conditioning

Posted: Mon Jan 12, 2015 9:59 am
by ddependo
A couple of us have put low profile air conditions on roof. I have a 16000 btu carrier & it keeps it in the 60s on a hot day. Wayne

Re: Air Conditioning

Posted: Mon Jan 12, 2015 11:22 am
by bill
shelbygt wrote:There's a roof hatch in the forward berth of my 30' M. I'm guessing it's a 14x14 opening which would be the right size for an A/C unit. Anyone use it for that? Would save from having to cut another hole in the hull.


BigM
Shelbygt, :idea:
I went with two of these type of units for my 37' :D I used a smaller btu unit in the v berth and a larger with heat for the salon.
http://www.homedepot.com/b/Heating-Vent ... 5yc1vZc4m4
I was able to use the side windows for venting. :)
bill

Re: Air Conditioning

Posted: Mon Jan 12, 2015 12:21 pm
by shelbygt
Bill, how do the portables work for you? I'm thinking it might be nice to be able to move the heating and cooling source around. Any drawbacks to it though? What brand did you go with or would you recommend?

Re: Air Conditioning

Posted: Mon Jan 12, 2015 4:35 pm
by bill
Yes, I went with the Haier brand. They do a good job. I bought them mainly for use at night. As some said you cant have to much ac on a boat ;) and stay away from the Cruisair units they ain't worth the hassle of installing, :roll: I mounted mine so as not to be portable. I didn't want them rolling around while underway.
bill