Everyone from Matt Resor (the gentleman who came to do the appraisal), the office staff, to the technicians that completed the installation were friendly, courteous and professional. Matt was particularly helpful as we had an email exchange to modify the work he would have originally had to do--he was knowledgeable and always responded to me in a timely manner. My installation appointment was scheduled for 10am but the first technician came at 8am (luckily I was off work), this was the only negative point I can think of! Overall, very happy with the service provided by Great Northern Insulation; expedient, professional and courteous and would recommend to others!