The economic viability of nine representative energy conservation options for Pennsylvania greenhouse operators is examined . The analysis is done using an Internal Rate of Return procedure for four major fuels under three price escalator assumptions. The minimum energy savings per square f=t per year is also calculated for each option. Wide variation is found in the economic feasibility of these options with the ones with the lowest installation costs generally providing the greatest IRR and the lowest required minimum savings per year. The results clearly indicate the need to evaluate carefully the economic viability of such investments beforehand.