The most expensive and most controlled environmental option available on the greenhouse market at this time. A totally enclosed greenhouse utilizes the design of positive pressure along this traditional HVAC heating and cooling to consistently set the temperature and humidity and the exact set points desired and the ability to achieve those set points year round regardless of outside temps or limiting environmental control factors in the options above. As the sunlight rises above the horizon it immediately begins creating a solar buildup in the greenhouse. The thermal load from the sun, especially when humidity levels are very high, is less than ideal for cannabis inflower making it at times almost impossible to maintain acceptable plant health during this period and can lead to crop failure and loss. DLI (Day Light Integral) is a measure of the total light accumulated in a 24 hour period. When growing in a greenhouse, growers can reach a DLI of 40 moles per day per meter squared, which is an ideal light accumulation and is unobtainable in an indoor growing environment with only grow lights. There truly is no substitute for the sun when growing plants, but atotally enclosed greenhouse provides growers with a clean, exact condition while still letting the sun in.