Hi Karl,
Years ago we produced a Pure Catskills Guide to Wood Products at the Watershed Agricultural Council. In it we listed businesses that offered dry-kiln services. I have attached the relevant page from it and highlighted the businesses. I'm sorry the image isn't better quality - hopefully you can read the phone numbers. Now this guide is probably 12+ years old so chances are many of these businesses are no longer in business, but they could be worth a try?
Best, Heather