These industrial-grade units are designed for the professional user. Plug & Play, these units are pre-charged with R-134*, eliminating the need for an HVAC technician to perform the installation! Each unit features an Air Handler and an Outdoor Compressor with variable speed control, designed to minimize noise. These industrial-grade A/Cís feature day/night thermostats allowing users to set the perfect temperature for day and night plant cycles. Additionally these units feature top and bottom plenums for easy duct installation. Optional Heppa and UV filters help to eliminate powdery mildew and other airborne pathogens.