Link4 Corp. is offering its iGrow 400/800 line of controllers for small- to medium-sized greenhouses. The controllers have an energy-use monitoring system that gives real data on energy use by individual pieces of equipment for heating and cooling systems, showing energy cost savings and return on investment for the controllers. The controllers can be used with a variety of equipment providing each piece of equipment’s complete operating history for easy transfer to a grower’s computer by USB drive, network or remote access via computer or cell phone. The controllers can control four (400 Model) or eight (800 Model) individual pieces of equipment or system elements.