The RETScreen Solar Air Heating Project Model can be used world-wide to easily evaluate the energy production (or savings), life-cycle costs and greenhouse gas emissions reduction for two basic applications: ventilation air heating and process air heating. The model is designed specifically for the analysis of transpired-plate solar collectors. This emerging technology has been successfully applied in a range of applications from small residential to larger commercial/industrial scale ventilation systems, as well in the air drying processes for various crops.