HOULTON, Maine — An Aroostook appliance repair technician kicked off a part-time business last summer that drew so much buzz he’s set to open a 2,000 square-foot refurbished appliance shop packed with like-new stoves, refrigerators, washers, dryers and freezers. Lawrence Hardy, a Houlton resident and owner of Hardy’s Appliance Solutions on historic Market Square, went on his first service call in August. By mid-September, he had 50 customers an…