"Cornerstone Mechanical Sales has been instrumental in the way we size and install domestic water heating systems. We have been able to provide our customers with reliable and tailored solutions for their domestic water heating needs. In addition to reliability our end users have seen a significant reduction in their utility bills and maintenance. Beyond the product selection and sale, their expertise gives me piece of mind that they will do whatever is necessary to keep my customers happy. I also trust in Cornerstone Mechanical Sales because of Greg Wallace's integrity as a person." Mike Petersen - Alpine Plumbing, Inc.