A Poly house (also called a glasshouse, or, if with sufficient heating, a hothouse) is a structure with walls and roof made chiefly of transparent material, such as glass, in which plants requiring regulated climatic conditions are grown. These structures range in size from small sheds to industrial-sized buildings. A miniature Poly house is known as a cold frame. The interior of a Poly house exposed to sunlight becomes significantly warmer than the external ambient temperature, protecting its contents in cold weather .
Many commercial glass Poly houses or hot houses are high tech production facilities for vegetables or flowers. The glass Poly houses are filled with equipment including screening installations, heating, cooling, lighting, and may be controlled by a computer to optimize conditions for plant growth. Different techniques are then used to evaluate optimality-degrees and comfort ratio of Poly house micro-climate (i.e., air temperature, relative humidity and vapor pressure deficit) in order to reduce production risk prior to cultivation of a specific crop .