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Supply Air Temperature Calculator

Required supply temperature (or airflow) to absorb a room's sensible load.

0
Required ΔT (°C)
0
Supply air temperature (°C)

Standard DX coils deliver ~12–14 °C air. If the math demands 8 °C supply, the room needs more CFM, not colder air — that's how coils freeze.

Formula

ΔT = Q/(1.21¡VĖ‡); T_supply = T_room − ΔT
References: ASHRAE air-side design practice

Supply Air Temperature Calculator is a free supply air temperature for HVAC designers, technicians and energy auditors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.

About Supply Air Temperature Calculator

Required supply temperature (or airflow) to absorb a room's sensible load. The calculation implements ΔT = Q/(1.21¡VĖ‡); T_supply = T_room − ΔT (ASHRAE air-side design practice). Standard DX coils deliver ~12–14 °C air. If the math demands 8 °C supply, the room needs more CFM, not colder air — that's how coils freeze.

How to use Supply Air Temperature Calculator

  1. 1Enter Room sensible load in kW.
  2. 2Enter Supply airflow in L/s.
  3. 3Enter Room setpoint in °C.
  4. 4Read Required ΔT, Supply air temperature instantly — no submit button needed.
  5. 5Need US units? Flip the SI/Imperial toggle and every field converts.

Why use Supply Air Temperature Calculator?

  • ✓Implements the standard formula — ΔT = Q/(1.21¡VĖ‡); T_supply = T_room − ΔT
  • ✓Reference cited on-page: ASHRAE air-side design practice
  • ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
  • ✓Built-in engineering verdict flags out-of-range results instantly
  • ✓Runs entirely in your browser — nothing uploaded, free forever

Frequently asked questions

What formula does the Supply Air Temperature Calculator use?+

It computes ΔT = Q/(1.21¡VĖ‡); T_supply = T_room − ΔT, per ASHRAE air-side design practice. The formula is displayed under the result.

What should I keep in mind when using this calculator?+

Standard DX coils deliver ~12–14 °C air. If the math demands 8 °C supply, the room needs more CFM, not colder air — that's how coils freeze.

Is this based on ASHRAE methods?+

The calculations follow the standard ASHRAE/ISHRAE formulations cited under the result, simplified where industry practice does the same. For permit-grade design, confirm with the full code procedure.

Is the Supply Air Temperature Calculator free to use?+

Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.

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