Utah State University Extension
In recent years, the use of high tunnels for extending the growing season has become fairly widespread. High tunnels operate and look like greenhouses (Image 1), but are passively heated and cooled which helps keep operating costs low.
Maughan, Tiffany; Ernst, Taunya; Black, Brent; and Drost, Dan, "Defending the Castle: Integrated Pest Management in High Tunnel Strawberries" (2012). All Current Publications. Paper 1054.