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Rifraf
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# Posted: 26 Jan 2012 02:16pm - Edited by: Rifraf
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My cabin is 12x32 with 7 foot walls, and 4 ft lofts.
Ill be installing a 12000 btu cooling / 10000 btu heating through the wall AC unit. halfway down on one of the long sides.
I will be installing this in the center of the unlofted space
click here to see fan
The lofts will have open entry doors and vented walls (gaps at bottom and top of the small railing wall. The entry into the back bedroom will have a door with blinds built in so air can travel through it.
Do you think the AC and ceiling fan will be enough circulation to distribute heat and cool , or do I need more ?
heres a visual to scale
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MtnDon
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# Posted: 26 Jan 2012 03:08pm
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I'm not an HVAC engineer but I think you will not have enough air circulation, resulting in uneven temperatures top to bottom, without having a ducted blower system. I also believe the fan is way undersized for the space.
Figuring Ceiling Fan Size
The upstairs could easily always be too warm compared to the downstairs, summer or winter.
I almost think the A/C should be installed upstairs; warm will always rise and cold descend.
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Rifraf
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# Posted: 26 Jan 2012 03:51pm - Edited by: Rifraf
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unfortunately I cant add a much larger one, because of the loft access ladders will put people too close to the fan. What if both lofts also run a desk fan blowing toward the ceiling fan ?
I guess I didnt describe the lofts very well, they dont have any straight walls, they begin at the roofline, the crest is almost 4 ft tall bu no place to install an AC wall unit. I can move it up a foot or two all the way to to meet the top running boards..
The ac unit is rated at 640sq ft , my space is about 340sq ft footprint
heres another shot I drew a black outline where i was going to install the unit.
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toyota_mdt_tech
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# Posted: 26 Jan 2012 06:24pm
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12,000 BTU enough?
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Rifraf
Member
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# Posted: 26 Jan 2012 08:41pm
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Well the unit says it can cool/heat up to 640 sq feet, my cabin is almost half that. based on that I think its enough, do you think I need more ??
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bukhntr
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# Posted: 29 Aug 2012 11:56pm
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I am building a similar cabin and am concerned about moisture between the roof and my ceiling. It looks like you are putting your ceiling right to the trusses. What are you insulating with.
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OwenChristensen
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# Posted: 30 Aug 2012 07:41am
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Good luck trying to keep the upstairs cool no matter what you have.
Owen
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TheCabinCalls
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# Posted: 30 Aug 2012 10:59am
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We used ICF walls and Spray foam for the cielings. The upstairs temp is the same as the down stairs. We open the place in the morning/night and close it for the day. It has never been over 80 degrees inside. We don't have A/C so it does get humid. We have a dehumidifier, but it generates heat. I need to find a way to exhaust it outside.
We brought a portable A/C unit one day just to test it, but it was noisey and just another thing/chore.
If you can seal the place and use foam or some barrier from letting heat radiate inside you will be happily surprised...
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