Trying figure out what btu a/c unit to install in a Hunter 336(33 foot).Looks like a 12000 btu unit but others have suggested 9000 btu.Any one have experiance with this size boat and what size unit are you using. The boat is moored in New England and normal temps are 80 to 90 degrees in summer, some extreme days of heat (100) and humidity but not many. Thanks for you imput !
- Status
- Not open for further replies.
B
Bill
Sound about right
Catalina is putting 17000 in its 350. I would think 12000 would be the smallest unit I would go with.
Catalina is putting 17000 in its 350. I would think 12000 would be the smallest unit I would go with.
J
Jack Tyler
You want it to run but not run-run-run...
...which is the benefit you'll get of the 12K BTU unit over the 9K unit. It should be very suitable for that size boat in that climate, and run times will be much easier to live with. Jack
...which is the benefit you'll get of the 12K BTU unit over the 9K unit. It should be very suitable for that size boat in that climate, and run times will be much easier to live with. Jack
J
J.B. Dyer
Penny Wise
Pete: A friend of mine has a 33.6 so I am familiar with your boats interior. I have an O'Day 34 with a little less cabin interior footage and a 16000btu air, reverse cycle. On 90+ degree clear days with the sun beating down, and The lack of a lot of insulation, it takes everything mine has to keep the interior comfortable, and it works well. It would be tough to go with a 12000 and the expenses involved and find out that it doesn't meet your expectations on those hot days. If you are going to spring for the money for the 12000, I would seriously consider the 16000 and the additional money. I believe that it would be worth it. Luck with your decision!
Pete: A friend of mine has a 33.6 so I am familiar with your boats interior. I have an O'Day 34 with a little less cabin interior footage and a 16000btu air, reverse cycle. On 90+ degree clear days with the sun beating down, and The lack of a lot of insulation, it takes everything mine has to keep the interior comfortable, and it works well. It would be tough to go with a 12000 and the expenses involved and find out that it doesn't meet your expectations on those hot days. If you are going to spring for the money for the 12000, I would seriously consider the 16000 and the additional money. I believe that it would be worth it. Luck with your decision!
G
Gord May
10 - 12 BTUH / Cu Ft
Sizing Air-Conditioning: The most oft-cited figures for sizing Marine Air-Conditioning are: 14 BTUH / Cubic Foot of Volume Below Deck 17 BTUH / Cubic Ft. of Volume Above Deck I am not afraid to reduce these figures to something closer to: 10 - 12 BTUH per Cubic Foot of Air-Conditioned living space*. Calculate volume of living space to be conditioned: Length x Width x Heigh = Cu. Ft. Hence: I would expect a 16,000 BTUH Unit to accomodate the needs of about 200 - 250 SQUARE Ft of living space, and 12,000BTUH to suffice for between 170 - 200 SQUARE Ft. (Assuming 6.25 Ft. Height) * ie: An over-sized A/C unit can chill the air so quickly that no appreciable de-humidification occurs prior to cycling “off” (short cycles), and typical sailboats (without Pilot House) have very little heat gain through glazing. Regards, Gord
Sizing Air-Conditioning: The most oft-cited figures for sizing Marine Air-Conditioning are: 14 BTUH / Cubic Foot of Volume Below Deck 17 BTUH / Cubic Ft. of Volume Above Deck I am not afraid to reduce these figures to something closer to: 10 - 12 BTUH per Cubic Foot of Air-Conditioned living space*. Calculate volume of living space to be conditioned: Length x Width x Heigh = Cu. Ft. Hence: I would expect a 16,000 BTUH Unit to accomodate the needs of about 200 - 250 SQUARE Ft of living space, and 12,000BTUH to suffice for between 170 - 200 SQUARE Ft. (Assuming 6.25 Ft. Height) * ie: An over-sized A/C unit can chill the air so quickly that no appreciable de-humidification occurs prior to cycling “off” (short cycles), and typical sailboats (without Pilot House) have very little heat gain through glazing. Regards, Gord
R
Rick Webb
Yeah, What Gord Said
I was instructed that it is better to go a little under than a little over in sizing an AC. If it does not run long enough to remove the humidity you end up with a cold damp boat. Humidity hay not be the problem up there that it is down here.
I was instructed that it is better to go a little under than a little over in sizing an AC. If it does not run long enough to remove the humidity you end up with a cold damp boat. Humidity hay not be the problem up there that it is down here.
D
Don Berger
You'll be fine
We have one 12k unit in our 40.5 in Narragansett Bay and it keeps the boat very comfortable even on the hottest days without overworking. We also have a dark hull which should exacerbate the solar affect so I'm sure you'll be right. Most of the marine A/C experts we spoke with said Not to take the generic formulas used to calc btu needs very seriously... Don
We have one 12k unit in our 40.5 in Narragansett Bay and it keeps the boat very comfortable even on the hottest days without overworking. We also have a dark hull which should exacerbate the solar affect so I'm sure you'll be right. Most of the marine A/C experts we spoke with said Not to take the generic formulas used to calc btu needs very seriously... Don
N
nathan
location of unit
I also have a 336, and am interested in putting in a unit next year. Would be interested in what you put in and where you put it.
I also have a 336, and am interested in putting in a unit next year. Would be interested in what you put in and where you put it.
P
Pete
Nathan in Warwick
My plan is to install the a/c unit under the starboard settee and run one duct forward and mounted in the v berth locker,a second duct to to installed in the locker at the navagitation station that I will tee off of to run a duct into the aft cabin. The aft cabin duct will be the hard one to run and I was think of going thru the nav station locker into the head and up thru and across the cabinet in the head to thru the wet locker into the aft cabin.I was think this should be ok as the aft cabin does not need much cooling.The vee berth locker duct I was going to set up to work either in the vee berth or the main salon depending on what is needed.The only flaw that I can see in my plan is that some duct work will be exposed in the area between the setee cabinet and the nav station locker but this is down low and only about 2 feet of duct will show. I was thinking I could somehow box it in for appearance.It should not be to hard to run the wires for the as unit will be close to electrical panel and bilge for the water supply. I saw a Hunter 340 and this is similar has to how it was done at the factory (or dealer) except some of the duct work. I think the 12000 btu unit is the way to go size wise.I need to double check diminsion to see if there is enough height clearance in the setee locker.I was also going to get the a/c unit with reverse cycle for heat. I had his on another boat and we used the heat as much (if not more) then the a/c. It is so much better then electric heaters!Any way that is my plan !Thanks to all who answered and any comments on my plan (good or bad) are welcome. Looking forward to spring!
My plan is to install the a/c unit under the starboard settee and run one duct forward and mounted in the v berth locker,a second duct to to installed in the locker at the navagitation station that I will tee off of to run a duct into the aft cabin. The aft cabin duct will be the hard one to run and I was think of going thru the nav station locker into the head and up thru and across the cabinet in the head to thru the wet locker into the aft cabin.I was think this should be ok as the aft cabin does not need much cooling.The vee berth locker duct I was going to set up to work either in the vee berth or the main salon depending on what is needed.The only flaw that I can see in my plan is that some duct work will be exposed in the area between the setee cabinet and the nav station locker but this is down low and only about 2 feet of duct will show. I was thinking I could somehow box it in for appearance.It should not be to hard to run the wires for the as unit will be close to electrical panel and bilge for the water supply. I saw a Hunter 340 and this is similar has to how it was done at the factory (or dealer) except some of the duct work. I think the 12000 btu unit is the way to go size wise.I need to double check diminsion to see if there is enough height clearance in the setee locker.I was also going to get the a/c unit with reverse cycle for heat. I had his on another boat and we used the heat as much (if not more) then the a/c. It is so much better then electric heaters!Any way that is my plan !Thanks to all who answered and any comments on my plan (good or bad) are welcome. Looking forward to spring!
- Status
- Not open for further replies.