Designing HVAC Systems to meet the Climate of the Future

How significant are recent and forecasted climate trends to the practical design of HVAC systems in the Southwest? That is a mouthful and a good question! Henry Johnstone, PE, President and Director of Mechanical Engineer at GLHN presented on this topic to the ASHRAE Tucson Chapter. He shared historical data that included trends dating back 1,000 years in the form of paleoclimatic data derived from tree rings and highlighted recent trends included last summer’s record breaking streak of 115 degree days. Henry discussed with the audience what this data tells us about climate in the future and how it impacts the design of HVAC systems that often operate for decades to come. The presentation take-away: design robust HVAC systems that can be adapted to expand, then diligently meter and ride the