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If an ordinary residential unit won't work for you, then you should consider something such as a Santa Fe, Ultra Aire, or another unit made by Therma-Stor. These are the kind that can be ducted, have air filters, etc. You probably will need to purchase and install through a professional HVAC company.
What Abe said is correct. Professional installation of anything built is would be recommended. Depending on what type of proejcts you'll be doing in the workshop you may need special filters to keep the dehumidifier from getting clogged up.
Dennis D. Gehman
Gehman Design Remodeling
355 Main Street
Harleysville, PA 19438-2417
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