Rehab - New lighting, insulation and etc - Energy Cost Savings

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Hello, BP members!

I am trying to figure out something here. I got contacted by a company which is specializing in energy cost renovation strategies - specifically installing LED lights, engineering, sustainability, operations of buildings and grounds. 

They say that they provide financing with lease..... and that way there is NO Capital Expense.. well obviously....

They also say that the property value increases as well, how is that possible?

Can someone explain or anyone have tried anything like that before?