RSES Journal Winter 2025, RETA-RSES

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FEATURES 08 “Safer” Refrigerants Revisited Leak detection and safe handling practices are as important with alternative refrigerants as with the refrigerants they are replacing.

10 Optimizing AHU Performance with Winter Maintenance Air handling units play a vital role in commercial building performance—from supporting energy efficiency to enhancing indoor air quality and maximizing occupant comfort. That is why it is critical to keep them running properly. 13 Next-level Maintenance Drives Winter Residential Heating Success Proactive maintenance is essential to avoid breakdowns in the coldest months. 14 Proper Use of Airflow & Air Velocity Measuring Instrumentation Use of airflow measuring instruments brings with it key protocols and best practices. 18 Charting a Service Path with Electrical Schematics Quite often, an HVACR equipment problem turns out to be an electrical problem. Electrical schematics serve as maps to assist HVACR technicians trying to solve any number of HVACR system failures. 22 2026 AHR Expo: HVACR at Many Crossroads The issues facing the HVACR industry are invariably connected, and they all intersect at the AHR Expo. 26 Thermal Energy Management: Smarter Cooling Strategies for Modern HVACR Systems Expanding needs for superior energy management strategies have increased the demand for thermal energy management systems, a technology that continues to offer energy efficiency solutions. 32 Small Diameter Copper Tubes Offer Design, Supply Chain and Performance Benefits Not only do they use less raw material, they use less raw materials and enhance heat transfer when produced with inner grooves. 36 How to Approach Preventive Boiler Maintenance The work a technician performs on a commercial boiler establishes that technician as the caretaker of record for that system. It is a large responsibility and one a technician should only accept if properly licensed and insured.

VOLUME 30 • NUMBER 3 • WINTER 2025 covering heating, ventilation, air conditioning and refrigeration

PERSPECTIVES 04 Leading Off 05 Heating Up 38 Shade Tree Mechanic 39 Last Word

WHAT’S NEW 06 Field News 28 RSES/RETA News 34 Products

WINTER 2025 RSES Journal 3

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