Heating & Cooling Supply has distributed wholesale HVAC equipment, parts, and supplies from its Lakeside branch on Riverside Drive since the company's founding in 1960, making it one of the longest-operating HVAC distributors in the country. The Lakeside warehouse stocks furnaces, condensers, coils, line sets, refrigerant, thermostats, and sheet-metal fittings for licensed contractors—including high-volume installation crews at Precision Temperature on Woodside Avenue. Inventory covers residential split systems from 1.5 to 5 tons, commercial packaged rooftop units, and ductless mini-split configurations from major OEM brands, with same-day counter pickup for emergency-repair components like capacitors, contactors, and blower motors. The distributor also provides technical-training resources and sales-growth tools that help HVAC contractors across East County sharpen their trade knowledge, complementing the electrical-panel and circuit work coordinated by Cosgrove Electric Inc. on Calle Lucia for new-system installations requiring 240-volt dedicated circuits. Highest-demand product lines include variable-speed inverter-driven compressors rated at 20+ SEER2 and low-GWP R-454B refrigerant-compatible equipment meeting California's 2025 HFC phase-down requirements under CARB regulations.