Tools

Hour bins from EPW, TMY2, TMY3, or NSRDB-style CSV by dry-bulb, dew-point, RH, or wet-bulb, split occupied / unoccupied, annual or by month.

HDD/CDD from EPW, TMY2, TMY3, or NSRDB-style CSV with configurable bases (°F-days or °C-days), split occupied / unoccupied.

HVAC and engineering units: temperature, pressure, flow, power, energy, length, area, volume.

Validate EPW, TMY2, TMY3, and NSRDB-style CSV format, required fields, and obvious data-quality issues.

Control-valve Cv / Kv sized from the coil out, with the valve drop estimated from branch resistance, a trim floor, and the authority your selected valve actually gets.

Free-cooling hours from a weather file for fixed or differential dry-bulb and enthalpy changeover, split occupied / unoccupied.

Moist-air properties from dry-bulb plus one other property, corrected for site elevation. Air mixing and coil sensible / latent load.

Read a BMS trend export (long or wide CSV) in your browser: stuck sensors, railed outputs, hunting loops, short cycling, unoccupied runtime and setpoint excursions, with charts and CSV out.

NEC Chapter 9 Table 1 fill from THHN/THWN-2 conductor areas and EMT internal area.

Hydronic pipe velocity, Reynolds number, and friction drop from flow and Schedule 40 ID.

Duct velocity, velocity pressure, and friction drop for round or rectangular duct.

Fan affinity laws at a new speed or impeller diameter, with optional density correction.

Pump affinity laws plus hydraulic power, brake horsepower, and specific-speed class.

Share of USHCN v2.5 monthly average temperatures NOAA flagged as estimated (E), by year from 2000 on, or measured versus estimated months for one station ID.

Generate a random pad and encrypt or decrypt a message with a one-time pad, in letters (A–Z) or hex (XOR) mode. Runs entirely in your browser; nothing is sent anywhere.