Energy Investment Systems (EIS) is a New York City-based energy company dedicated to developing custom improvement packages that maximize operating cost reductions and leverage program incentives to offset capital costs. EIS focuses on providing long-term, cost-effective energy solutions for apartment buildings, including oil-to-gas conversions that reduce energy bills and carbon footprints. The company collaborates with top specialists and manufacturers in fields such as heating, cooling, and electrical systems.

EIS has made significant strides in the energy sector by consistently delivering high-performance solutions that yield lifetime savings several times the cost of the improvements. The company also assists clients in structuring low-cost financing options to ensure projects remain financially viable from the start. Notable achievements include Lewis Kwit's participation as a speaker at the 37th Annual CNYC Housing Conference, highlighting EIS's influence and thought leadership in the industry.