This article presents the energy and economic effectiveness of a fruit and vegetable dryer developed at the University of Rousse, Bulgaria. The heating of the drying agent could use solar energy, geothermal or waste waters, a conventional source, or both conventional and unconventional energy sources. Based on the experimental results, the saved energy by different schemes for energy supply is determined. Compared with the possibility of saving money from using solar energy and the heat utilized, the investment will be paid back within 2.4 years.