Airforge: HVAC/R Field Tools
33 offline HVAC/R tools: P/T charts, superheat, subcooling, diagnosis & more.
Airforge is a field toolkit for HVAC and refrigeration technicians. 33 calculators and
references, built on verified data, that work entirely offline — because the mechanical
room never has signal.
No account. No sign-in. Nothing to load. Open the app and start working.
**CHARGING, SUPERHEAT & SUBCOOLING**
• Pressure-temperature (P/T) chart for 58 refrigerants — dew and bubble curves, verified
point-by-point against reference thermodynamic data to within 0.0005 psi
• Superheat and subcooling calculators with manufacturer target ranges
• Line-set charge adder, compression ratio, target evaporator exit temperature
• Uses the dew curve for superheat and the bubble curve for subcooling — the way a blend
actually behaves
**SYSTEM DIAGNOSIS**
Enter your gauge pressures and line temperatures. Airforge ranks the likely faults —
undercharge or leak, overcharge, non-condensables, restricted metering device, dirty
condenser, low or high airflow, TXV problems — and shows the reasoning behind each, not
just a one-word verdict. It is a second opinion for the readings you already trust.
**AIR SIDE**
• CFM from temperature rise, duct sizing (round and rectangular) by velocity
• Static pressure, external static, target airflow
• Full psychrometrics: wet bulb, dew point, enthalpy, relative humidity, grains
• Delta-T check and filter sizing
**ELECTRICAL**
• Ohm's law and power, motor FLA reference, capacitor microfarad check
• Wire ampacity and voltage drop
**HEAT & COMBUSTION**
• Furnace temperature rise, combustion air, gas pipe sizing
• Water heating and a quick heat-load estimate
**REFERENCE**
• Refrigerant safety class and GWP, EPA 608 quick reference
• Unit conversions and altitude / barometric correction that feeds every psychrometric
calculation automatically
**BUILT FOR THE JOB**
• Everything works offline
• Job records — save readings against a customer and address, then export a clean PDF and
text or email it before you leave
• Your company name, phone and licence number head every report
• Pin the tools you use every day; search by refrigerant, formula or unit
• Adaptive layout: comfortable on a phone, laid out properly on a tablet
**FREE & PRO**
The core toolkit is free, including 12 common refrigerants. Airforge Pro unlocks all 58
refrigerants and unlimited job records — a one-time purchase, no subscription. A rewarded
video grants a 24-hour Pro trial so you can try it on a real call. Remove Ads is available
on its own.
Video
Airforge: HVAC/R Field ToolsScreenshots
Free calculators
Try the tools in your browser. The app has them offline.
Try a few questions first
A question of the day and a 10-question sample with explanations. The full question bank and the timed mock exams are in the app.
How-to guides
How to Check Superheat and Subcooling on an AC System
Which reading to charge by, where to clamp, and what high or low superheat and subcooling tell you about the charge.
5 min readHow to Measure Total External Static Pressure
Two test ports, one manometer, and a number you compare to the data plate. How to measure TESP and read what it tells you.
5 min readHow to Size an Air Conditioner for Your Home
BTU per square foot gets you a starting size; Manual J gets you the right one. Why bigger is worse and what the numbers mean.