Airside: HVAC Tools & PT Chart

28 HVAC tools that show their work — PT chart, superheat, duct and pipe sizing, ventilation, load, combustion — each one naming its method and source. Works offline.

Airside is a field engineering suite for HVAC technicians, estimators, and mechanical engineers. No account. No ads. Calculations need no connection — every table and equation ships inside the app.

FREE — NO SIGN-UP
• PT Chart — 28 refrigerants, saturation temperature ↔ pressure
• Superheat / Subcool — charge diagnostics with a target superheat estimator
• Charge Weight — line-set volume to pounds of refrigerant
• Psychrometrics — full air state on a psychrometric chart, with an indicative comfort region
• Fan Laws / VFD — CFM ∝ N, SP ∝ N², BHP ∝ N³
• Design Weather — outdoor design conditions for 246 North American cities
• Reference screens — humidity, pressure, dew point, energy, engineering constants

AIRSIDE PRO — EVERY CALCULATOR
Air: Duct Sizing (SMACNA, Darcy-Weisbach + Colebrook-White) · Ventilation single-zone and multi-zone with System Ev (ASHRAE 62.1 method; rates per the 2025 California Mechanical Code) · Air Traverse (pitot grid, velocity-averaged) · Coil Performance (air-side capacity check) · AHU Process with a plotted psych chart · TAB Worksheet (NEBB procedures)
Hydronic: Pipe Sizing (Darcy-Weisbach + Darby 3-K fittings) · Pump Selection with multi-segment TDH · Expansion Tank · Fluid Properties for water and glycol
Electrical: Motor Load from field amps (NEC Art. 430, NEMA MG-1) · Belt / Sheave Drive
Energy: Block Heat Load, a preliminary sizing aid — CLTD opaque surfaces plus a 24-hour CTF simulation · Chiller Performance on CAPFT/EIRFT curves (AHRI 550/590 rating conditions) · Combustion Efficiency (Siegert stack loss) · System Efficiency (EER/COP/kW-ton)

LIVE ESTIMATE — SEPARATE SUBSCRIPTION (INCLUDES EVERY CALCULATOR)
Walk the building once and leave with a document:
• Scan rooms with LiDAR for dimensions, doors, and windows, and tag equipment as you go
• Measure pipe and duct runs in AR — they flow straight into the sizing calculators
• Import a PDF blueprint and scale it; on vector PDFs, pull the equipment schedule off the sheet
• Tag photos with observations, room by room
• Build a takeoff schedule from what you captured
• Export a client-facing preliminary sizing report with a stated confidence band — not a fake-precision number

BUILT TO BE TRUSTED
• Every calculator shows its method and source on screen
• Where a method has limits, the app says so instead of hiding it
• Results cross-validated against CoolProp (NIST-based equations of state), manufacturer refrigerant charts, and NOAA station data

MADE FOR THE FIELD
• Calculators work fully offline — mechanical rooms, crawlspaces, and basements included
• Every calculator result exports to a real vector PDF and out through the iOS share sheet
• Save snapshots to a project and compare before/after readings
• Search the words you use: "friction loss", "gauges", "flow hood", "clamp meter"
• Imperial and SI throughout
• Dark mode, high-contrast themes, and text scaling

WHO IT'S FOR
Service techs charging systems and chasing airflow. Estimators turning a walkthrough into a preliminary scope and budget. TAB contractors. Mechanical engineers who want the standard cited, not implied. Instructors and apprentices.

NOTES
LiDAR room scanning requires a LiDAR-equipped iPhone or iPad Pro. Blueprint import, calculators, and PDF export work on any supported device. Airside Pro is a yearly subscription or one-time purchase; Live Estimate is a separate monthly or yearly subscription. Subscriptions renew until cancelled. Purchases need a connection.

Verify every result before acting on it. Live Estimate output is preliminary: not for permit, procurement, or final design. Standards bodies are named to identify published methods; Airside is not affiliated with or endorsed by them.

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