Don't Sweat It Air and Heat, Inc. replaced an air conditioning system for me. I also purchased the extended warranty with the system. The first time they came out, it was raining, and they decided to reschedule to prevent moisture from getting into the lines. I thought that was a very good idea as moisture in the lines can cause problems years down the road. When they came back the second time, they started the installation at 10 AM and they stayed until 10 PM in order to finish the job. The installers arrived on time. They were friendly and professional. They didn't mind answering questions. I liked that they were willing to finish the job and not come out the next day. I felt that the Don't Sweat It Air and Heat, Inc. technicians were not just there to do a job, but that they wanted to do the best job possible.