Past experience with the company. I am confident with products they use and the quality of the installation and service of those products. Mike Coonradt has been to our home on several occasions in the last year to preform service on our basement Triple Safe Sump Pump, Water Guard French drain and SaniDry XP dehumidifier systems. He has also installed a cellar stairway banister and replaced some ceiling heating duct vents. All work was done well to our satisfaction. Mike is always open to answering my questions and explaining the nature of his service work.