HVAC Logic
Transparent, peer-reviewed engineering calculators for HVAC airflow, duct sizing, cooling loads, heat pumps & field diagnostics. 100% free & client-side.
A startup from the United States that is founded by Miad Saadidi.
Transparent, peer-reviewed engineering calculators for HVAC airflow, duct sizing, cooling loads, heat pumps & field diagnostics. 100% free & client-side.
A startup from the United States that is founded by Miad Saadidi.
This page is designed to help you find out whether HVAC Logic is good and if it is the right choice for you.
HVACLogic is an open-access engineering suite and computational laboratory for building science, fluid dynamics, and HVAC electrification.
All 21 calculation tools run 100% client-side in pure TypeScript with zero database tracking, zero telemetry, and instant job-site computation speed.
Key Capabilities & Governing Standards: * Airflow & Ducts: Colebrook-White friction factor equations solved via Newton-Raphson numerical iterations, Darcy-Weisbach head loss, and ACCA Manual D sizing protocols. * Cooling & Thermal Loads: ACCA Manual J (8th Edition) residential heat load calculations, Manual S equipment selection, and AHRI 210/240 performance ratings. * Heating & Heat Pumps: Cold-climate balance point models, low-ambient COP deratings, and NFPA 54 combustion air sizing. * Refrigerant Diagnostics: NIST REFPROP saturation curves, zeotropic A2L temperature glide evaluation (R-454B, R-32), and target superheat/subcooling charging tools. * Building Science: Multi-layer wall and roof assembly R-value and U-factor calculations conforming to IECC 2021/2024 climate zones.
Official Website: https://hvaclogic.org Calculators Directory: https://hvaclogic.org/calculators
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Deterministic Building Science Engine
Solves duct friction, airflow dynamics, and psychrometrics using Colebrook-White, Darcy-Weisbach, and NIST thermodynamic physics.
Live Reactive Visualizers
Real-time dynamic SVG and Canvas diagrams rendering duct aspect ratios, combustion air ventilation, and thermodynamic refrigeration cycles.
100% Client-Side Privacy
All calculations execute entirely in the user's browser with zero database storage, telemetry tracking, or project data transmission.
URL State Hydration & Sharing
Serializes all input parameters into shareable URLs for instant peer review, calculation auditing, and verifiable project records.
Dual IP & SI Unit Standards
Instant bidirectional unit switching across Imperial and Metric systems adhering to ASHRAE fundamentals and ACCA manual standards.
HVAC Logic replaces legacy empirical rules-of-thumb with deterministic, peer-reviewed engineering physics. It solves complex Colebrook-White friction factors, Darcy-Weisbach head losses, psychrometrics, and thermodynamic refrigeration cycles directly in the browser with live reactive visualizers and zero server-side telemetry.
Unlike expensive legacy desktop suites or ad-cluttered online calculators with hidden formulas, HVAC Logic is 100% free, requires no installation or account creation, operates entirely client-side for complete privacy, and provides transparent mathematical formulations with instant shareable URL calculation states.
HVAC design engineers, MEP consultants, building science researchers, commissioning agents, field diagnostic technicians, and mechanical engineering students who require fast, rigorous, and verifiable thermodynamic calculations.
HVAC Logic was established to resolve the widespread problem of oversized equipment and improperly balanced duct systems caused by crude trade shortcuts. By uniting fundamental ASHRAE physics, modern web performance, and live interactive visual modeling, it provides engineers and technicians with transparent, verifiable tools accessible from both the office and the field.
TypeScript, React, Next.js, HTML5 Canvas, reactive SVG rendering engines, and Vitest for continuous mathematical unit testing against NIST REFPROP, ASHRAE Fundamentals, and ACCA standards.
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