hvacpy Documentation

HVAC and building energy calculations for engineers.

Free, open, practitioner-first Python tooling that replaces expensive proprietary software for everyday HVAC engineering calculations.

pip install hvacpy

User Guide

• Quickstart
• Assembly
  • Assembly
• Psychrometrics
  • AirProcess
  • AirState
  • PsychChart
  • dew_point_from_humidity_ratio()
  • dry_bulb_from_wet_bulb()
  • humidity_ratio_from_rh()
  • sat_pressure()
• Heat Loads
  • CoolingLoad
  • HeatingLoad
  • InternalGain
  • Orientation
  • Room
  • WallComponent
  • WindowComponent
  • Zone
  • get_design_conditions()
  • list_design_cities()
• Equipment Sizing
  • Cooling Equipment
  • Heat Pump
  • Duct Sizing
  • Ventilation
  • Airflow Functions
  • Convenience Functions
  • Exceptions

Project

• Changelog

Overview

Module	What you can calculate	Since
Assembly	U-values and R-values for any wall, roof, or floor construction	v0.1
Psychrometrics	All moist air properties from any two known conditions	v0.2
Heat Loads	Cooling and heating loads for rooms and zones (CLTD/CLF method)	v0.3
Equipment Sizing	Split systems, RTUs, FCUs, chillers, heat pumps, duct sizing, ventilation	v0.4

Design Principles

• Correct before fast — all equations trace to ASHRAE and ISO sources

• Units everywhere — every value carries its unit, no silent conversions

• Practitioner language — APIs use terms engineers actually use

• The engineer always decides — hvacpy calculates and warns; it never refuses