Free tools
Two tools engineers reach for every day, run by the same code HVAC Builder solves systems with. The psychrometric chart needs no account; the compressor maps are read with a free one.
Psychrometric chart
Opens in the app as a tab of its own: read any state, zoom and pan, export to PDF — and a solved system draws every air process it made onto it. The standalone chart stays for drawings you want to keep as a link.
Compressor-map lookup
Any of the catalog's compressor maps — thousands of published AHRI 540 polynomials — evaluated at your evaporating and condensing temperatures, signed in (every account is free): capacity, power, COP, mass flow, and whether the point is inside the manufacturer's envelope. The search opens in the app as a tab of its own, with the rating and the envelope, capacity and power lines and curves plotted.
Refrigerant charts
Every refrigerant the catalog's compressors run on: the pressure–temperature line drawn and readable at any point, dew and bubble on a zeotrope, in kPa, bar and psig with the latent heat and densities — and a compressor's envelope laid over it as its evaporating and condensing pressure bands. The tables stay as pages of their own.
Want the whole machine? Open the builder — it solves a coil, a compressor and a condenser together, and runs them against a year of weather.