Our greenhouse kits feature a Thermostatically Controlled Ventilation System and Aluminum Bench Framework. Besides the fact that a Sunglo greenhouse is a "good buy", it is extremely economical to operate. Sunglo greenhouses are constructed with two wall panels. This double-wall construction allows for better temperature control than glass. The two layers of high impact acrylic plexiglass create a one and a half inch "dead-air" space. This space provides ten times the insulation of a single pane of glass! This makes a Sunglo greenhouse energy efficient no matter where you live.