Tonna Mechanical, Inc. is locally owned and operated. Providing full services for heating, air conditioning, plumbing, water ... conditioning, radon testing & mitigation, indoor air quality since its inception in 1976, Tonna Mechanical, Inc. has made a commitment to quality, integrity, and reliability. Supported by a professional management team our goal is to be your mechanical contractor of choice by offering the best service possible at a reasonable price - from routine maintenance to complete installations. Tonna Mechanical takes pride in being one of the few Carrier Factory Authorized Dealers (CFAD) in Southeast Minnesota. One of the requirements for us to become a CFAD was to have our technicians become N.A.T.E. (North American Technical Excellence) certified. This requires us to provide the proper training and skills necessary for our technician to pass written exams. These exams ensure the technician coming to your home or business is trained with the proper skills and knowledge to service your equipment. N.A.T.E. is becoming an industry standard to assure customers are getting the best possible service. read more