Airkit: HVAC Calculator
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About this app
Airkit is the all-in-one HVAC calculator built for working technicians. Superheat and subcooling, refrigerant charging, the ductulator, PT charts, airflow, static pressure, and the electrical numbers — every calc you reach for on a service call, in one fast, offline app.
Built for modern systems. Airkit handles A2L refrigerants (R-454B, R-32, R-454C) with glide done right — dew point for superheat, bubble point for subcooling — alongside R-410A, R-22, R-134a and 15+ more.
CHARGING
• Superheat & subcooling with live verdicts against your target
• Target superheat from indoor wet bulb + outdoor dry bulb (fixed orifice / piston)
• Delta T health check
• Charging assistant — pass, add, or recover refrigerant
REFRIGERANT
• PT chart — a pressure-temperature slider for 20+ refrigerants
• Line set charge — ounces per foot for the actual run
• A2L handling, oil pairing, and cylinder-color reference
AIRFLOW
• Ductulator — round & rectangular duct sizing by friction rate or velocity
• CFM per ton and target airflow
• Static pressure designer — TESP, filter and coil drops, friction rate
ELECTRICAL
• MCA / MOCP with copper wire sizing (NEC 2023)
• Capacitor check — rated vs. measured, plus under-load microfarads
• Ohm's Law and AC power
PLUS
• Unit converter — pressure, vacuum microns, temperature, airflow, capacity, length and more
• Offline reference: thermostat wiring, superheat/subcooling targets, duct velocity, line sets, ACR copper tube, refrigerant & oil pairing
WHY AIRKIT
• Works fully offline — no signal in the mechanical room, no problem
• No account, no sign-up
• Fast, glove-friendly, and readable in the dark or in glare
• Values consistent with NEC 2023 and ASTM B280 — always verify against the locally adopted code
• Full English and Spanish support
Free to use, with an optional Pro unlock for the complete refrigerant set and advanced tools.
Airkit is an informational aid for trained HVAC/R professionals. Always follow equipment nameplates, OEM literature, and local code.
Built for modern systems. Airkit handles A2L refrigerants (R-454B, R-32, R-454C) with glide done right — dew point for superheat, bubble point for subcooling — alongside R-410A, R-22, R-134a and 15+ more.
CHARGING
• Superheat & subcooling with live verdicts against your target
• Target superheat from indoor wet bulb + outdoor dry bulb (fixed orifice / piston)
• Delta T health check
• Charging assistant — pass, add, or recover refrigerant
REFRIGERANT
• PT chart — a pressure-temperature slider for 20+ refrigerants
• Line set charge — ounces per foot for the actual run
• A2L handling, oil pairing, and cylinder-color reference
AIRFLOW
• Ductulator — round & rectangular duct sizing by friction rate or velocity
• CFM per ton and target airflow
• Static pressure designer — TESP, filter and coil drops, friction rate
ELECTRICAL
• MCA / MOCP with copper wire sizing (NEC 2023)
• Capacitor check — rated vs. measured, plus under-load microfarads
• Ohm's Law and AC power
PLUS
• Unit converter — pressure, vacuum microns, temperature, airflow, capacity, length and more
• Offline reference: thermostat wiring, superheat/subcooling targets, duct velocity, line sets, ACR copper tube, refrigerant & oil pairing
WHY AIRKIT
• Works fully offline — no signal in the mechanical room, no problem
• No account, no sign-up
• Fast, glove-friendly, and readable in the dark or in glare
• Values consistent with NEC 2023 and ASTM B280 — always verify against the locally adopted code
• Full English and Spanish support
Free to use, with an optional Pro unlock for the complete refrigerant set and advanced tools.
Airkit is an informational aid for trained HVAC/R professionals. Always follow equipment nameplates, OEM literature, and local code.
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No data shared with third parties
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This app may collect these data types
Personal info, App activity and 2 others
Data is encrypted in transit
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What’s new
Initial release.
App support
About the developer
Chirag Arora
me@chia.ro
Tadeusza Romanowicza 4B/570
30-702 Kraków
Poland
