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  • Photovoltaics


    The State of Pennsylvania now offers rebates for PV installation.

  • Passive Solar Design

    Trombe Wall

    Passive Solar Design

    Your home's windows, walls, and floors can be designed to collect, store, and distribute solar energy.

  • Active Solar Space Heating

    Solar Space Heating


    Solar Air Heating Systems

    Solar air heating systems use air as the working fluid for absorbing and transferring solar energy through a residence.

Keystone Energy Efficiency Alliance
1501 Cherry St.
Philadelphia, PA 19102

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