HVACLogic is an open-access, deterministic engineering calculation suite executing 100% client-side with full offline PWA support. It delivers 21 engineering tools for air duct sizing (Colebrook-White), Manual J heating/cooling loads, SEER2 AC tonnage, and A2L refrigerant diagnostics. Built with zero tracking cookies, transparent physics equations, and 1-click printable PDF job submittals.
PowerLab is a free, zero-database energy planning suite with transparent physical loss models:
ā¢ Battery & UPS: Real runtime with chemistry DoD (LiFePO4 vs AGM) & inverter tare losses.
ā¢ Solar PV: Seasonal tilt angles & NREL PVWatts V8 monthly solar output.
ā¢ EVs: Level 1/2 & DC Fast Charge times with 80% SoC tapering & gas savings.
ā¢ Home Energy: Appliance wattage audits & electric bills.
100% client-side, zero database tracking, works offline (PWA), and exports 1-page PDF spec sheets.
PowerLab ā Energy Planning Toolsenergy & solar calculators with visible physical loss modelsAug 2026
