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Started By
Message
A/C for a Metal Building
Posted on 8/4/16 at 1:45 pm
Posted on 8/4/16 at 1:45 pm
Hey guys,
Construction starts on my metal building in a couple of weeks and I need advice for an A/C unit. It's a 24x36 insulated building and I'm going to have them frame openings in the wall for a window or through the wall unit. I don't expect to get the building "cool" by house standards in the middle of the summer, just looking to take the edge off and keep the humidity down.
Does anyone have any suggested models, brands in the $700 an under range? I'm also looking for opinions on the pros/cons of standard 110v vs. 220v units.
Any advice is appreciated.
Construction starts on my metal building in a couple of weeks and I need advice for an A/C unit. It's a 24x36 insulated building and I'm going to have them frame openings in the wall for a window or through the wall unit. I don't expect to get the building "cool" by house standards in the middle of the summer, just looking to take the edge off and keep the humidity down.
Does anyone have any suggested models, brands in the $700 an under range? I'm also looking for opinions on the pros/cons of standard 110v vs. 220v units.
Any advice is appreciated.
9
Posted on 8/4/16 at 1:49 pm to CajunAlum Tiger Fan
so you're going for the not 104 degrees but 83 degree kind of ac system? Just get the proper unit needed to handle the space.
Posted on 8/4/16 at 1:56 pm to CajunAlum Tiger Fan
Not sure on the different manufacturers or how much they cost, but why not one of those huge fans up top? I don't think a window unit is going to cool that large of a space. What is the construction going to look like? Any garage doors? Seems like you could keep air flowing by opening some doors/windows and a huge fan going while you're in there.
Posted on 8/4/16 at 1:58 pm to CajunAlum Tiger Fan
why not just install a package unit? All it needs is 2 small ducts.
Posted on 8/4/16 at 2:06 pm to CajunAlum Tiger Fan
nothing smaller than a 2 ton. I have a 30x30, completely built out (walls and ceiling) with a 2 ton mini split. AC unit struggles to keep up in Aug.
Posted on 8/4/16 at 2:24 pm to CajunAlum Tiger Fan
Quit being cheap and put a full unit with some duct work. then it will be cool when your wife finds out how much you spent and you have to sleep in it.
Posted on 8/4/16 at 3:09 pm to bonescanner
quote:
Quit being cheap and put a full unit with some duct work. then it will be cool when your wife finds out how much you spent and you have to sleep in it.
I'm already way over budget on this thing, so I'll be in there anyway!
Posted on 8/4/16 at 3:11 pm to CajunAlum Tiger Fan
it'll be way more efficient of a unit to size appropriately than undersized and constantly running never keeping up.
Posted on 8/4/16 at 3:12 pm to meauxjeaux2
quote:
why not just install a package unit? All it needs is 2 small ducts.
I'm not familiar with a package unit - I need to do some homework on this option.
Posted on 8/4/16 at 3:23 pm to CajunAlum Tiger Fan
quote:
It's a 24x36 insulated building
Insulated how? Cavity insulation? Do you know the R-value?
Posted on 8/4/16 at 3:27 pm to Chad504boy
quote:
it'll be way more efficient of a unit to size appropriately than undersized and constantly running never keeping up.
This is not actually true at all. A/Cs draw the most current at startup. Once they are running, the smaller unit has the same SEER rating as the bigger unit, so the "efficiency" is the same. However, if it stays a bit warmer, delta-T is higher, thus it can more efficiently remove heat.
Frankly, the most efficient a/c is one that runs constantly and keeps your room at the temperature you want while doing so. Not only does this limit the number of peak draws from motor starts, it is also the most effective way to remove humidity from the room. If you oversize the unit, you have both peaking starts regularly and your unit does not run long enough to properly dehumidify the space.
Posted on 8/4/16 at 3:30 pm to CajunAlum Tiger Fan
quote:
I'm not familiar with a package unit - I need to do some homework on this option.
It's actually called a "packaged terminal unit." It's basically what you see installed in a hotel room.
I went and got confused before. What I had described is actually a ductless mini split system, which is probably more what you would want to do. It doesn't require the large hole and installation that a PTAC would.
This post was edited on 8/4/16 at 3:41 pm
Posted on 8/4/16 at 3:32 pm to Jester
quote:
the most efficient a/c is one that runs constantly and keeps your room at the temperature you want while doing so.
an undersized unit wouldn't accomplish this, thus its why its called undersized. if undersized were right sized than right sized would be oversized. and the r value to pi ratio is always a cause of concern when metal exterior is being penetrated by suns neutrinos.
Posted on 8/4/16 at 3:33 pm to Jester
quote:
Insulated how? Cavity insulation? Do you know the R-value?
All I meant was thst it comes with the radiant barrier bubble insulation, but I'm going to insulate it further after completion. I'm not sure what material I'll use.
I'd like to decide on an A/C plan now so I can tell the builders if there is anything I need framed up or holes cut.
(Are you in the HVAC business?)
This post was edited on 8/4/16 at 3:35 pm
Posted on 8/4/16 at 3:34 pm to CajunAlum Tiger Fan
where's building location at?
Posted on 8/4/16 at 3:36 pm to CajunAlum Tiger Fan
I have an uninstalled LG dual zone ductless system. I only have 1 evap, though. I can get more details if interested.
Posted on 8/4/16 at 3:39 pm to CajunAlum Tiger Fan
quote:
(Are you in the HVAC business?)
I'm not. I'm a mechanical engineer and certified energy manager, so I know quite a bit. If I was in the HVAC business, I'd be the guy trying to talk you into oversizing the unit.
I may have missed up, but will this building just be one large room?
Posted on 8/4/16 at 3:39 pm to Chad504boy
quote:
where's building location at?
Lafayette
Posted on 8/4/16 at 3:41 pm to MSWebfoot
quote:
I have an uninstalled LG dual zone ductless system. I only have 1 evap, though. I can get more details if interested.
Yeah, I'm thinking a ductless mini split is probably his best option.
Posted on 8/4/16 at 3:43 pm to Jester
You need to know what insulation you are going to have before you can even begin to size the unit that you buy. If you don't plan to finish the interior walls, you should probably plan on adding a few inches of spray foam insulation.
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