Greenhouses need insulation for the same reason as residences and metal buildings: to reflect radiant heat. Super R® Plus Ag Barrier® and Tempshield® Reflective Insulation are the recommended products for this application.
“Up to 85% of the heat loss from a greenhouse occurs at night," according to a study by Virginia Tech University. "Using a thermal blanket to retain heat at night can be a cost-efficient investment…[and] blankets offered primarily for heat retention can reduce energy use by up to 50%, whereas blankets offered as combination thermal blanket and summer shade protection can reduce winter energy use 25% or more.”
Reflective Insulation Advantages:
Air, moisture, and vapor barrier
Retains 95% of the radiant heat
Does not promote the growth of fungi or bacteria
Provides no nest support for rodent or insect pests