HVAC Engineering Toolkit
Psych chart workspace + quick calculators
View: auto Wheel = true zoom around cursor · Hold scroll-wheel button to pan
Includes saturation curve, relative humidity curves, dry-bulb lines, humidity-ratio lines, and enthalpy / approximate wet-bulb lines. Use mouse wheel to true-zoom the chart, hold the scroll-wheel button to pan, and Reset View to return to auto-fit.

Calculator Library

This page gives you a place to grow the app into an HVAC utility suite instead of one oversized psych chart screen. I added a practical first batch of shared engineering calculators using the same psychrometric and elevation logic already in the app.
IP-focusedElevation-awarePsychrometric helpersElectrical helpersRefrigerant charge

Calculator elevation settings

Set one shared elevation here for the entire calculators page. Elevation-aware calculators automatically use this value, and cards that use the air-density factor show the active factor for reference.

Linear interpolation

Interpolate y for x between two known points.

Mixed Air Calculator

Returns mixed-air properties from two airstreams using DB, a selectable moisture component, and CFM for each stream.
Using shared elevation — and pressure —

Electric heat ΔT

Temperature rise across electric heat section.
Using shared elevation factor: —

Sensible capacity

BTUH from airflow, sensible ΔT, and elevation factor.
Using shared elevation factor: —

kW to BTUH

Simple electric power conversion.

Properties of Air

Returns air properties from dry-bulb and one selectable moisture component using the shared page elevation.
Using shared elevation —, pressure —, and elevation factor —

MCA and MOCP

Range-based electrical helper calculations.

Minimum CFM from fan turndown and face velocity

Returns minimum CFM and the governing requirement.

Refrigerant charge total

Precharge plus additional lineset charge beyond included length.