Very knowledgeable, courteous and professional. One of the workers arrived after the others. He had gone to Home Depo to pick up something they needed for the install. When he arrived he made it a point to say hi, introduce himself, and shake my hand. They do what they can to not make too much mess. Took the time to put cardboard down so they wouldn't track dirt on the carpets coming into the house. Made sure we knew how to run and take care of the heat pump. Cleaned (vacuumed) everything up before they left.