Features Efficiency Energy
Energy curtains save water too

An increasing number of greenhouses have retractable shade or energy curtains, which makes shading easy, notes MSU’s Erik Runkle. There are several advantages of these curtains, most notably that they can be used during periods of high light (for shading) and at night (to reduce heat loss), but can be opened on cloudy days.

But for those without access to energy curtains, Runkle discusses opions and more right here.