The air conditioning technology includes devices that measure and/or influence the climate of a grow room by regulating air, heat and humidity. Air conditioning turns a grow room into a professional facility because it keeps the climate constant as the plants need it. In most cases energy can be saved by its use. As a rule of thumb, the following values are considered ideal:

• Cuttings and seeds: Day phase with 18-22 hours light; 25 degrees soil and air temperature and approx. 80% humidity - in the night phase also 25 degrees
  
  
• Plants in the vegetative stage, mother plants: Day phase at 16-20 hours light; 25 degrees air temperature, 60 - 80% humidity - at night phase 16 to 22 degrees
  
  
• Photoperiodic plants in flowering stage: day phase in 12 h light; 25 degrees air temperature, 40 - 60% humidity in 12 h light - in night phase 15 to 22 degrees
  
  
• Autoflowering plants in flowering stage: day phase at 16-20 h light; 25 degrees air temperature, 40 - 60% humidity - at night phase 18 to 22 degrees