Brothers Ken and Irwin Sher, co-founders of Day & Nite / All Service, the New Hyde Park-based commercial HVAC and refrigeration company they started in 1977, spent several years preparing for the day when their sons would take over. That time came in January, but despite preparation, transition is never simple. Ken’s son, Matthew, 41, serves as president and vice president of sales, and Irwin’s… click here to read more.