Our Specifications

ThermaGro Greenhouses are manufactured from the highest quality components. Durability and efficiency are achieved by glazing the greenhouse with a superior 8mm twin-wall polycarbonate sheeting, which is 60% more efficient and 200 times stronger than single pane glass. A superior product, the sheeting is warranted against chipping, cracking, fading, peeling, excessive yellowing, and hail penetration for ten years. Curved "gothic arch" and conventional straight-wall styles are both available in a kit form and in 10 sizes from 8'x8' to 12'x20'. All kits come complete with a steel anchoring base and a complete electrified ventilation system. Additional options and custom designs are available. Call us for more details.

Greenhouse Ventilation Gothic Arch Greenhouse Straight Wall Greenhouse

Curved "Gothic Arch" Design

  • Stronger and More Elegant
  • Superior Wind and Snow Deflection
  • Advanced Insulating Properties

ThermaGro Straight-Wall Design

  • Ideal for a Conventional Look
  • Gutters for Rain Collection
  • Easier to Assemble


Large Greenhouse


Our quality components exceed industry standards, making the ThermaGro System the most weather-resistant four-season greenhouse of its kind, ensuring its lasting beauty for years to come.

  • White Enamel Finished Aluminum 1½" Square Tube Frame
  • White PVC Vinyl Outer Caps
  • Unique Gasketing System for a Hermetically Sealed Structure
  • Self-Drilling Fasteners for Ease and Durability


We believe that the greenhouse must be anchored on a flush level and square base. Thus, each kit includes a coated, 2" x 4", hollow steel base that is anchored to the ground via caissons (8" diameter tubes) on each corner. The base of the greenhouse is then screwed onto the 2"x4" steel base.

Optional Features

  • Hanging Basket Bars
  • Full-Length 2' Wide Aluminum Shelving
  • Additional or Oversized Doors
  • "Off-Grid" Solar Drive Systems
  • Custom Sizes and Enclosures


All greenhouses are available in a conventional straight-wall or a curved "gothic arch" style. Both styles are complete in a kit form or can be installed by our qualified installers. Our only requirement is a level area on which to anchor and assemble the greenhouse.

  • Excellent Insulating Properties (U-Factor of 0.58, Light Transmission of 82%)
  • Extreme Durability (Impact and UV-Resistant Materials)
  • Elegant Design (White Frame and Seals, Clear Panels, and a Superior Fit and Finish)

Sizes Available

  • 8'x8'
  • 8'x12'
  • 8'x16'
  • 8'x20'
  • 10'x12'
  • 10'x16'
  • 10'x20'
  • 12'x12'
  • 12'x16'
  • 12'x20'

Introducing the Colorado Extreme

  • Offset Peak for Increased
    Southern Exposure
  • Triple Insulated Reflective
    North Wall
  • Designed for Extreme Climates & High Altitude Locations

Colorado Extreme