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Who We Are Johnson Mechanical, LLC is a customer focused heating and air-conditioning company that was originally started in 1986. Located in Portage, WI, we employ highly trained people whose goal is to make our company the best service company in Portage Area and the Surrounding 40 Miles. Our company specializes in designing, engineering, and installing complete comfort systems for owners of existing homes and buildings just like yours. We take special pride in the craftsmen we train and employ--a fact you'll notice immediately in the attitude and integrity they bring to your job site. Our entire company works hard to make your experience with us hassle-free and enjoyable. Should we make a mistake, we will do everything in our power to correct it to your satisfaction.