Electromechanical controls for use in horticulture and indoor gardening to operate watering systems, control temperatures, control lighting, control humidity, and to control CO2 levels; Electromechanical controls used to control lighting; Electromechanical controls used to control carbon dioxide levels; Electronic timers for controlling electric powered appliances; Electromechanical controls for use to control air moving equipment; Electromechanical environmental controllers for sensing environmental conditions and operating electrically powered equipment in response thereto; Electromechanical controls for use to operate plant watering systems