This unique design (created and tested by Solstice Solar engineers) provides season extension for a wide variety of plants as well as a light and airy sun room for your enjoyment.

How does Solistice Solar differ from traditional greenhouses?

  • While common hoop-styled greenhouses require replacement of the polyurethane skin on a yearly or bi-yearly basis, the rigid polycarbonate panels of this design are impervious to wind, hail, and accumulated snow. These durable panels are warranted by the producer for 10 years.
  • Traditional heated greenhouses have relied on gas-powered heaters throughout the cold months. Instead of fossil fuels, this design uses two infinite, free, naturally-occurring sources of heat: the sun and the earth.

So how does it do all that?

  • Polycarbonate panels covering the south-facing side of the greenhouse transmit 74% of the incipient light while simultaneously providing an insulation barrier of R-2.4.
  • The light energy is stored as heat energy in water-filled barrels positioned along the north wall.  This thermal energy serves as a thermal governor, radiating heat into the greenhouse’s interior space during the night as outdoor temperatures fall.
  • The second natural source of heat is the earth itself. Geothermal heat energy in the 50°+/- degrees F range is continuously conducted upward from the earth, bringing heat into the interior greenhouse space.  The in-ground insulation captures this heat, and prevents thermal fringing losses to the soil surrounding the frame base.
  • For additional flexibility, a grow-light may be used to increase fruit and vegetable production. A small portable heater may also be used to mitigate the effects of the coldest nights.

All in all, this greenhouse is a permanent structure that will provide many years of gardening enjoyment!

The list of building materials is complete with recommended sources for the more technical items. Assembly instructions are easy to follow and result in a robust, weather-proof greenhouse for gardening in the colder months.
–Bill M, mechanical engineer and gardener