Low technology greenhouses offer only limited control of the growing environment but are widely used in the greenhouse industry. However, for growers wanting to upgrade their systems, to date, little information has been available about the impact of investing in new technologies on yields and economics of crop production. Using cucumber as a model, this project conducted scientific research and financial analysis of greenhouse production to quantify the effect of modifying these systems. Increasing plant density was also evaluated as a potential strategy to boost yields and provide cooling in low technology greenhouses. The results provided clear evidence of the economic benefit of improving greenhouse systems which should encourage the industry to move towards a medium technology-based industry.