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50 percent air conditioning system ambient applications areas boiler Building Envelope building owners building's CFLs chilled water supply chiller efficiency coefficient of performance compact fluorescents condenser water Consider cooling load cooling tower fans copper loss daylight economizer electricity Electronic air cleaners energy audit energy conservation program energy efficiency energy management energy required energy savings energy-efficient lighting Energy-Saving engineer excess air exit signs facility fixtures fluorescent lamps full-load glass head loss horsepower humidity HVAC improve increase installation insulation Keep Going kw/ton lamp is rated lamps and ballasts lighting energy lighting system lower mercury lamps metal halide lamp nameplate needed NY-based occupancy sensors off-peak Office Equipment older elevators operation payback piping preheat refrigerant replace incandescent lamps result retrofit roof save energy set point solar heat gain starter steam surfaces T8 lamps thermal break thermostats valves variable air volume variable frequency drive Water Heating water supply temperature Window films