Pfister Energy upgraded the roof through the installation of a solar‐ready PVC roofing system. The new white PVC cool‐roof membrane has a solar reflectivity 12 times greater than the existing black asphalt roof, resulting in significantly less summer heat gain, lower HVAC costs, and improved employee comfort.
In addition, the white roof resulted in significantly cooler rooftop temperatures enabling improved for the solar array, as photovoltaic modules loose approximately .5% energy production per ⁰C in temperature gain.
To address the outdated high‐bay lighting, Pfister installed 72 SolaTube daylighting units over the production floor, illuminating the facility with bright natural daylight. Humanscale employees saw a significant improvement in the amount and quality of light delivered by the daylighting units.
To further improve the lighting efficiency, Pfister upgraded the outdated T‐5 high‐bay fixtures with high efficiency LED fixtures with occupancy and daylight harvesting sensors that dim or brighten the LED’s automatically based upon the light contribution from the SolaTube daylights.
Pfister offset the remaining energy consumption in the facility through the use of a photovoltaic array to produce on‐site renewable energy. By accounting for the reduced energy consumption through the proposed efficiency improvements, Pfister Energy was able to reduce the size of the solar array from 900 kW to 775 kW, reducing the project cost by over $250,000 and providing an improved financial return to Humanscale with a lower capital investment.