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Old 05-02-2008, 10:46 AM   #1
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Air conditioning question


Ok, on the other section of building and construction I talked about my 1800sq/ft garage. Now that I am getting close to putting A/C in it, I need some advice. It has 10 ft ceilings, only 2 side windows. I have talked to 2 different A/C companies and get totally different suggestions. One says to put in just a 3.5 ton and that will cool it just fine. The other says that I need a 5 ton. This is something that won't run all the time like a house, but just when I want to go out and work in there during the summer months in Houston. I want it done right the first time so that I don't put something too small in that won't cool it or something too big that short cycles.

Anyone with any advice since two people in the same biz are way off of eachother? (kinda like my engineers for the ceiling joists in my other threads!!)

Thanks.

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Old 05-02-2008, 06:51 PM   #2
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Typically they size the units at around 1 ton per every 600 sq. feet or so, which means that with a 3.5 ton unit you would be right about maxed on size requirements.

Since this is a shop/garage, chances are it will not maintain temperature as efficiently as say a house would, so I would recommend going for the 5 ton unit.

You won't be over enough that you would be short cycling. However with the 3.5, you might overwork it and burn it up.

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Old 05-02-2008, 09:46 PM   #3
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In your situation, I'd go with the 5 ton unit. You won't be waiting as long for it to cool, and if you're concerned about overshooting, just keep the fan on while you're out there.

Rob

Last edited by micromind; 05-02-2008 at 09:51 PM.
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Old 05-03-2008, 08:10 PM   #4
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Air conditioning question


Is the garage insulated and have finished walls and ceilings? If it is 3.5-4ton should work. Installing a 5ton won't hurt anything unless you are working with wood then humidity will come into play.If you oversize you will have humidity issues and cause the wood to have added moisture that will cause you headaches if you are building furniture or cabinets.
You might want to consider an attic fan as well if you have a finshed ceiling. It will remove some of the load in the attic so the ac doesn't work so hard.
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Old 05-06-2008, 12:25 PM   #5
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Air conditioning question


Yes it will have finished walls and ceilings and be insulated. I have two attic fans in the roof to help remove the heat when it's all done. So you think a 5 ton will not get rid of the humidity? Remember that I will only use this AC when I want to work in the garage (building hot rods), not all the time like a house AC. So I need something that can cool it fairly quick and keep it cool once I'm out there working. Thanks for the help. Sorry I haven't checking in online a while, been working a lot!
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Old 05-06-2008, 07:48 PM   #6
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737Pilot,

5 tons will cool your workshop quickly and that is the problem. To remove humidiity, you need long run times. It really depends on what you are going to be doing out there. If it is furnature making, I would go with the 3.5- 4ton system. If you are turning wrenches on your antique 57 Chevy then by all means go with the 5ton. It will cool down faster than the 3.5 - 4 ton.
By the way, I'm rather envious it sounds like a really nice work shop, enjoy!
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Old 05-06-2008, 08:38 PM   #7
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Air conditioning question


Thanks for the advice....It's funny you said a 57 chevy, because that's exactly what's in there right now!! Here's a picture of it. I'm very lucky to have this big garage (if I lived anywhere other than Houston, I wouldn't be able to afford it). I will be just turning wrenches on it and hopefully a 56 chevy. No furniture will be made in there! All automotive. I guess I should start looking into 5 tons units!
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Old 05-06-2008, 09:40 PM   #8
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How sweet is that! Thanks for sharing the photo.
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Old 09-22-2009, 09:17 PM   #9
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Really nice snap. please tell me the best company of car air Conditioners..

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