Caswell Mechanical, Inc. was founded by Jeff Caswell in 1999 as a full service plumbing, heating, ventilation and air conditioning company. Jeff has over 20 years experience in the industry, is licensed as a master plumber in both Massachusetts and New Hampshire; and, is EPA certified. Caswell Mechanical's trained technicians have years of experience providing plumbing, heating, ventilation and air conditioning services, repairs and installations for residential, industrial and commercial accounts.