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. Terms of Use: https://getairside.app/terms Privacy Policy: https://getairside.app/privacy