One of the major expenses to operate enterprise facilities is the cost of energy consumed. A school as education business facility requires major budget consideration every year for the electricity; especially, facilities that need the power day long. This project tries to present technology improvement analysis for dorms of a typical public-school using investment recovery approach. Equivalents flow model has been developed to the system for five years term, and used to test the improvements. Analyzing the result showed the payback period is 6.275 years while the lifespan of windows tint on average lasts 10 years, therefore investing in this technology instillation is strongly supported decision to decrease the amount of electricity consumed which provides more room in the budget as a result of annual savings.