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Boosting HVAC Efficiency: ASHRAE 90.1’s 15°F ΔT Requirement for Chilled-Water Coils

September 1, 2025

In ASHRAE Standard 90.1-2016, a critical update was introduced: Chilled-water cooling coils must now be selected with a minimum 15°F temperature difference (ΔT) between the entering and leaving water temperatures at design conditions.

What Does This Mean?

This new requirement is designed to increase system efficiency by reducing pumping energy, optimizing coil performance, and lowering overall operating costs.

✅ Example Compliance:
Entering Water Temperature: 42°F
Leaving Water Temperature: 57°F
ΔT: 15°F ✅ (Meets ASHRAE 90.1 Standard)

🔑 Why It Matters:
✔️ Lower Water Flow = Less pumping energy
✔️ Higher ΔT = Better coil heat transfer efficiency
✔️ Reduced Operational Costs = Improved chiller performance & sustainability

Many engineers and designers are now re-evaluating their coil selections to ensure compliance with this efficiency-driven standard.

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