My 98 year old Grandmother's heater stopped working unexpectedly. Pro-tech had a tech out the same day to check on the problem. They determined that because of the age and unavailability of parts, the heater needed to be replaced. Justin and Kevin showed up the very next day and had the new heater installed within 8 hours. They were very courteous, professional, and respectful of my grandmother and her space. They took the time to do things safe and correctly, explaining the entire process along the way. They installed a new heat run, an intake and exhaust, condensation pump and line, as well as upgrading out hot water heater exhaust and chimney liner, all in 8 hours. Very effecient, and they left everything cleaner than they found it. They even took time to show me all the work they did, where all the shutoffs were, how to change the filter, etc. I appreciate very much the great quality, fast turn around, and excellent customer service.