Greenhouse? Glasshouse? Coolhouse? Hoophouse? High Tunnel? Coldframe? What's the Difference? Although many people use the term "greenhouse" for most of the other terms listed above, they are technically separate things. Part of the confusion comes from the fact that most sellers of greenhouse-like structures will call any structure they're selling a "greenhouse" because that's the term customers are usually using as they search. Glasshouses Glass was once one of the only materials thought suitable for constructing a greenhouse-like structure. For some time, "glasshouse" and "greenhouse" were pretty much used synonymously. Glasshouse structures were built out of glass, both the walls and the roof, because glass is transparent and allows an optimal amount of light for plant growth. Glass could capture the sunlight so that the area under the glass heated up. Greenhouses A basic definition of a greenhouse is a permanent stru
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