About HVACLogic
HVACLogic was created to provide transparent, reproducible calculation tools and technical references as an alternative to opaque or lead-generation-focused calculators. We believe HVAC design engineers, mechanical contractors, and building scientists deserve transparent, reproducible calculations with visible physical assumptions and losses.
Our Engineering Charter
No Lead-Gen Gates
Zero forced email captures, zero phone number solicitations, and zero gated results. Every calculation output, chart, and exportable report is accessible immediately.
Physics-Based Engineering Models
Calculations are derived from physical principles and published engineering methods, industry standards (ASHRAE, ACCA, SMACNA), energy codes (IECC), and thermophysical property reference data.
Client-Side Calculations
All calculation models execute client-side directly inside your browser. No project floor plans, load figures, or customer dimensions are stored in an external database. Standard anonymous web analytics are collected for performance measurement.
Validation & Engineering Review Process
Every formula implemented in HVACLogic undergoes a multi-stage review and testing process before deployment:
- Engineering Reference Mapping: Mathematical equations and reference tables are cross-referenced against active ASHRAE, ACCA, and industry technical publications.
- Automated Regression & Unit Testing: Automated Vitest test suites verify calculations against documented reference cases and thermophysical property data points.
- Documented Empirical Deratings: Selected empirical correction factors (such as flexible duct sag models and zeotropic refrigerant temperature glide) are incorporated using documented engineering references and stated assumptions.
- Ongoing Standards & Code Review: We review relevant standards, codes, and regulatory changes and update applicable calculation methods when appropriate.
- Peer Feedback & Errata Tracking: Users and engineers can report calculation discrepancies, unit anomalies, or standards updates directly via our GitHub issue tracker â.
Technical Documentation & Open Monograph
The mathematical models and computational methods powering HVACLogic are documented in an open technical preprint and engineering monograph:
Author: Miad S. âView Engineering Methodology âLaboratory Sources & Standards âPrivacy Policy â