NRG came to my house and created an energy efficient heating and air conditioning system for our ranch style home. The house was built in the 50's with rooms added on to make it a sprawling ranch house, with a lot of rooms needing different kinds of heating and air systems. We have two rooms that were add-ons and neither could accommodate ducting - so we had NRG install two mini-split systems that are mounted on the walls, require no ducting and keep the room perfectly warm or comfortably cool.
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