The July-August 2026 edition of HPAC Engineering tackles several developments contractors should track. ASHRAE's presidency changes hands this summer, bringing new priorities for codes, standards, and energy policy that will shape specs you're bidding next year. The Society's direction on refrigerant transition timelines, ventilation standards, and electrification guidance flows directly from leadership — worth knowing who's steering.

The issue dives into digital twin technology for commercial HVAC systems. These virtual building models simulate performance before equipment ships, catching load miscalculations and sequencing problems during design rather than commissioning. For contractors doing design-build or large retrofits, digital twins cut change orders by identifying duct sizing errors, inadequate ventilation paths, and control conflicts in the modeling phase. Expect engineers on high-performance projects to reference twin data during submittals — you'll need to understand how those simulations translate to installed capacity and airflow.

Data center moratoriums get significant coverage. Municipalities from Northern Virginia to Phoenix are pausing new data center permits due to grid strain and water use for cooling. These facilities pull 20-50 MW each, equivalent to 15,000 homes, and many rely on evaporative cooling in drought-prone regions. For contractors in markets considering moratoriums, diversification matters — if 40% of your commercial work is hyperscale mechanical rooms, that pipeline could freeze. The issue explores liquid cooling and air-side economizers as alternatives that reduce both power and water demand.

Also covered: using engineered microbes for IAQ improvement in healthcare settings, ABMA's focus on Pittsburgh for boiler efficiency programs, and a case study cooling Tennessee's Cumberland Caverns — 27 miles of underground passages requiring humidity control without standard condensate drainage. That cave project offers lessons for anyone doing HVAC in challenging environments: remote monitoring, backup dehumidification, and equipment access planning when you can't just roll a lift to the unit.

For contractors, the takeaway is tracking where codes and client expectations are headed. ASHRAE leadership shifts ripple into Manual S updates and utility rebate structures. Digital twins will become standard on projects over $2 million. And if your market has data centers, understand the regulatory risk and efficiency technologies that keep those projects moving.