Unit Converter →
Convert common HVAC engineering units.
ENGINEERING REFERENCE
HVAC&R Quick Reference
A searchable field reference for the formulas, constants and unit relationships used across the Leal HVAC&R Toolbox.
Scope: This page is an engineering memory aid, not a replacement for project calculations, equipment manufacturer data, safety requirements or applicable codes and standards. It deliberately does not publish generic code-required ACH, ventilation rates, duct-velocity limits, refrigerant charge limits or safety classifications.
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Reference conventions
- Cooling-capacity conversions use the International Table BTU and kilocalorie conventions documented by the toolbox.
- Water and dry-air properties shown here are the same fixed design approximations used by the corresponding calculators.
- Psychrometric equations use the same dry-air mass basis as the validated psychrometric engine.
- Pressure conversion never changes gauge/absolute reference unless atmospheric pressure is explicitly included.
- Refrigerant bubble and dew references preserve blend glide instead of presenting one ambiguous saturation temperature.
WHEN TO USE THIS TOOL
Useful during reference & conversion work.
- Resolve unit-system differences quickly across calculations, drawings, schedules and vendor data.
- Look up common formulas, constants and engineering reminders without leaving the HVACR workspace.
- Reduce repeated manual conversion work while keeping the final engineering review with the user.