Hoop House vs. Growing Dome®

A hoop house (also called a high tunnel) is a lightweight greenhouse made from metal or PVC hoops covered with polyethylene plastic film. It is one of the most accessible ways to begin season extension and is widely used by both home gardeners and commercial growers. According to the USDA’s Natural Resources Conservation Service, high tunnel systems are a common conservation and season-extension practice among farmers.

Hoop houses primarily rely on daytime solar gain. Because most models use single-layer plastic and lack insulation or thermal mass, they cool quickly after sunset. In mild climates, this may be sufficient to overwinter hardy crops. In colder regions, growers typically rely on row covers, heaters, or other supplemental systems to prevent freezing.

For more technical details on how high tunnels function and are constructed, see this cooperative extension article from Oklahoma State University Extension.

Advantages of a Hoop House

• Lower upfront cost
• Straightforward installation, often DIY
• Effective for spring and fall growing
• Flexible size options for small or large operations

Limitations

• Plastic film usually needs replacement every 3–5 years
• Limited insulation and heat retention
• Vulnerable to wind or snow if not properly reinforced
• Larger temperature swings between day and night

Hoop houses are often a practical choice for growers seeking an affordable seasonal or shoulder-season solution.

A Growing Dome greenhouse is a geodesic dome structure designed for structural strength and passive solar performance. The spherical shape distributes wind and snow loads evenly and allows sunlight to enter from multiple angles throughout the day.

Growing Domes use multi-wall polycarbonate glazing, passive solar orientation, and an above-ground pond that acts as thermal mass. During daylight hours, the pond absorbs heat; at night, it releases stored warmth back into the growing space. Upper and lower automatic vents support natural convection airflow, helping regulate temperature and humidity. In larger models, integrated intake and exhaust fans help maintain consistent airflow and temperature regulation throughout the space.

When installed correctly and managed well, this design can significantly reduce temperature fluctuations and extend the growing season to year-round in many climates.

Advantages of a Growing Dome

• Engineered to withstand high wind and snow loads
• Multi-wall polycarbonate provides improved insulation compared to plastic film
• Integrated thermal mass moderates temperature swings
• Designed as a permanent structure
• Capable of supporting winter growing in many regions

Considerations

• Higher initial investment
• Requires a prepared foundation
• Installation is more involved than a basic hoop house

Growing Domes are typically chosen by growers planning long-term use and year-round production rather than short-term season extension.

Longevity is one of the most significant differences between these greenhouse types.

Hoop houses are generally considered semi-permanent. Frames may last many years, but polyethylene coverings degrade from UV exposure and weather stress, requiring regular replacement. In areas with heavy snow or strong winds, additional reinforcement and maintenance are often necessary.

Growing Domes are designed as permanent structures. The wooden geodesic frame is engineered to handle high winds (rated up to 115 mph when properly installed) and substantial snow loads (up to 120 psf). Polycarbonate panels typically last longer than plastic film, thanks to a UV protective coating, and offer greater impact resistance.

Actual lifespan for both structures depends on site conditions, installation quality, and ongoing maintenance.

Energy performance varies widely between these two designs.

Hoop houses trap heat during the day but lack built-in insulation or thermal storage. As a result, interior temperatures can fluctuate rapidly. In cold climates, winter production usually requires supplemental heat.

Growing Domes rely on passive solar principles and thermal mass to buffer temperature swings. The combination of stored heat, insulation, and natural airflow can reduce, but not always eliminate, the need for supplemental heating in winter.

Performance depends heavily on climate zone, available sunlight, crop selection, and greenhouse management. No greenhouse is entirely “set and forget,” especially in extreme weather conditions.

Hoop houses typically have a lower upfront cost. Small DIY models may cost a few thousand dollars, while larger or commercial systems cost more depending on materials and reinforcement.

Growing Domes involve a higher initial investment, often ranging from the low five figures upward, depending on size and customization.

Long-term costs vary based on:

• Replacement materials needed
• Heating and cooling requirements
• Structural repairs
• Labor and installation

For short-term or seasonal growing, hoop houses often provide strong value. For growers seeking a durable, low-replacement structure designed for decades of use, Growing Domes may offer greater long-term efficiency.

Hoop houses are widely used to extend spring and fall growing seasons and to protect crops from early and late frosts. They perform well for leafy greens, brassicas, and seed starts.

Growing Domes are often used for expanded winter growing and diverse plant varieties such as tropicals. In suitable climates and with proper management, growers use them to harvest cold-hardy plants during winter months and support more temperature-sensitive crops, like tropicals, with supplemental heat.

Successful year-round growing in any structure depends on climate, plant varieties, soil health, and active management. The greenhouse itself is only one part of the system.

Hoop houses are lightweight and relatively easy to install, but polyethylene film requires regular replacement and contributes to plastic waste over time. Framing materials are typically not sold as standalone products and must be purchased as a set.

Growing Domes are designed for long-term use and are made to be repairable. All components can be purchased and replaced as needed, including structural components. Polycarbonate panels generally last longer and are recyclable in many regions. Passive solar operation can reduce reliance on fossil fuels compared to actively heated greenhouses.

Environmental impact ultimately depends on how the greenhouse is built, operated, and maintained.

The best greenhouse for you is the one that matches your climate, budget, and long-term growing plans. If you want an affordable way to extend your growing season for a few months each year, a hoop house may be the right fit. If you’re looking for a permanent structure designed for durability, passive solar performance, and expanded winter growing capacity, a Growing Dome greenhouse may better support those goals.

Growing Spaces has been designing and installing Growing Dome greenhouses for more than three decades across a wide range of climates. If you’d like to explore dome sizes, design features, and real-world growing applications, we would love to assist. Click the button below for a free Growing Dome quote and consultation.

You also don’t have to take our word for it. Check out some real-world customer experiences to help you determine whether this approach fits your growing goals.