These greenhouses are covered with 16mm 5 wall polycarbonate which provides
them with superior heat retention, light diffusion, and strength. 16mm 5 wall
polycarbonate has almost double the insulation, 3.03
R Value, of any other covering offered! This greenhouse is recommended for
people who wish to heat their greenhouse in northern climates and other areas
that experience frequent cold weather. They also feature an aluminum capping system
which ensures the panels will stay on the greenhouse in high winds. All Arctic
models are only available with straight eaves. Each greenhouse includes a sturdy
pre-hung storm door with adjustable tempered glass window and screen. The standard
height of the side walls is 5' 6", giving ample room inside for tall gardeners
and hanging baskets. All Cross Country greenhouse lengths are extendable in 2'
increments to allow for future expansion. The included instructions and step-by-step
assembly video make these greenhouses easy to assemble.