A modular duct system for a wind turbine system, and an energy efficient wind turbine system and method therefor, which utilize a multi-chambered duct system to transfer heat generated by the electrical busway in an inner chamber into a thermally connected outer chamber which holds purified air received from an air treatment facility on a lower portion of the wind turbine. The heated air becomes buoyant and naturally travels upwardly through the outer chamber of the duct system to the nacelle of the wind turbine system without the need for blowers or a thermal conditioning unit. The heating of the air compensates for heat which is naturally lost as the air travels to the nacelle. The modular duct systems serves as an energy recovery system which utilizes heat byproduct to heat the treated air and improve the efficiency of the wind turbine system.
