An Introduction to Vapor Pressure Deficit

By Haley Bridgnell

How well do you understand temperature and relative humidity? By Harry Connor Vapor Pressure Deficit (VPD) is used by growers to assess how dry the air is at a given moment. If the air is too dry, photosynthesis will stop in order to protect the plant from exhaustion. Photosynthesis is the process of converting sunlight,…

Water Barrels vs. Phase Change Material

By Haley Bridgnell

  Innovation plays an important role in every industry. Bulky, inefficient methods are catalysts for new-age technology. Since traditional greenhouses lack insulation, thermal masses can provide extra heat. Thermal mass materials absorb heat during the day and release the heat back into the greenhouse at night. Water barrels are widely used to maintain temperatures in…

Setting Controls in a GAHT System or Climate Battery

By Haley Bridgnell

  A climate battery is a ground to air heat exchanger, which provides year-round heating and cooling of solar greenhouses and other structures using the thermal mass of the soil underground. Ceres’ patent-pending Ground to Air Heat Transfer (GAHT™) is a high-performance climate battery specialized for year round greenhouse growers. For more on how a…

Tips on Using Water Barrels in a Solar Greenhouse

By Haley Bridgnell

The following is an edited excerpt from The Year-Round Solar Greenhouse. Year round greenhouses, or even those used for season extension, face the challenge of extreme temperature swings. The structure collects excessive amounts of heat during the day when the sun is out, causing them to easily overheat. However, they quickly lose this heat at…

Energy-Efficient Ways to Cool a Greenhouse

By Haley Bridgnell

Growing in a year-round greenhouse often means contending with heat. For most crops, photosynthesis slows when temperatures exceed 95 F. As the dog-days of summer hit, we explore the most energy-efficient ways of cooling a greenhouse. 1. Keep heat out (Shade Cloth)  Best for: all climates The first is to reduce light and heat gain…

3 Ways to Heat Your Greenhouse for Free this Winter

By Miriam Schaffer

Learn how to harness and store solar energy to keep your greenhouse growing through the winter for free (or next to nothing) Greenhouses can be interesting environments to grow in. This is because standard greenhouse materials like glass and plastic (“glazing”) are extremely good at letting in light and heat in, and extremely good at…