Dear Mr. Ray,
We wanted to take this opportunity to tell you how pleased we were with the services your company provided us. It was indeed a pleasure to deal with top notch professional employees and management. We were impressed with the caliber of the workmen who were at our house performing the duct work. They worked with knowledge and expertise and carried on in an efficient manner whether alone or with supervision.
More than they they were informative and did not seem to mind explaining the procedure to us. They also gave some helpful tips that made the process easier for us. Technically competent employees are increasingly rare. You are fortunate to have not only skilled employees but also customer service ones.
You can be sure if we have the opportunity we will highly recommend your company and services.