This chimney and duct cleaner, the Black Knight, began his career in 1976, which coincides with the first energy crisis when folks began using alternative methods -- oil and wood -- for heating. Along with the upsurge in those types of heating came the need for maintenance. Today Black Knight services include: heating and air conditioning sales, installation and service. Also available is a full service sheet metal shop with design build fabrication capabilities for custom duct systems and specialty items.