Reply by Ed

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Posted on Mini Split System AC for garage shop

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28 posts in 2042 days

#1 posted 10-04-2012 06:05 PM

I have a tiny shop, 8×20= 160 sq ft with a 10,000 BTU air conditioner for cooling. My walls and ceiling are insulated and my shop runs at 73 F and 45% RH (I have de-humidifier for summer and humidifer for winter.) with an outside temp of 100F and RH of 90%. My wood stays stable.

I took dust collection very seriously and installed a ClearVue cyclone which is 5 HP and spent hours designing and implementing point source dust and chip collection. Reading Bill Pentz’s site helped a lot with this. A 3 HP system would be border line for any home shop when you run the engineering numbers for air flow needed Vs HP. As a result, my shop stays clean with healthy breathing air as verified by an air quality meter. The filters can fo go for a year or more and then be blown clean continued to be used with no replacement costs.

When running a 5 HP dust collector and a 2.5 HP band saw my shop starts heating up. Depending on how long I run them it may get to, say 78F. Then is takes a few hours for my AC to bring it back down to 73F. I wish I had a bigger unit.

Your shop is 3 1/2 times bigger than mine and your insulation is currrently poor (sometimes future insulation projects take years to get done) If you ever plan to REALLY take care of chip and DUST and run other llarge machines, I believe your 24,000 BTU is undersized if you want a very comfortable tiemperature like mine in very hot weather.

The comment you said about dust collection, namely “nothing is perfect” is true. But what most people truely mean by a comment like this is “I let myself of the hook and 1) have not gottern a system with enough point source air flow and 2) have not gotten a system with enough final particle size filtration and 3) have not spent qualtiy time and effort figuring out effective point source collection methods.” Only you know if you fit this bill. But if you can ever see any dust in the air OR a pile on the floor then you know the answer.

-- Ed

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