Laboratory Sources & Standards
HVACLogic mathematical equations, physical derating coefficients, and editable presets are maintained against verified peer-reviewed publications, national laboratories, and engineering safety standards.
Authoritative Engineering Standards
ASHRAE Handbook â Fundamentals (Chapters 18, 21, 30)
American Society of Heating, Refrigerating and Air-Conditioning Engineers
Governs outdoor climatic design conditions, duct design fluid mechanics (Darcy-Weisbach / Colebrook equations), and psychrometric state points.
Manual J (8th Edition) â Residential Load Calculation
Air Conditioning Contractors of America
National ANSI standard for sizing residential heating and cooling equipment based on building envelope heat loss and sensible/latent heat gain.
Manual S (2nd Edition) â Residential Equipment Selection
Air Conditioning Contractors of America
Standard protocol for matching sensible and latent cooling capacities of OEM equipment to Manual J loads within 90%â115% tolerances.
Manual D (3rd Edition) â Residential Duct Systems
Air Conditioning Contractors of America
Comprehensive ductwork sizing methodology utilizing Total Effective Length (TEL), available static pressure, and equal friction rate calculations.
HVAC Duct Construction Standards â Metal and Flexible (4th Edition)
Sheet Metal and Air Conditioning Contractors' National Association
Standardizes duct gauge thicknesses, reinforcement requirements, fitting loss coefficients, and flexible duct sag derating curves.
Clean Air Act Section 608 & American Innovation and Manufacturing Act
United States Environmental Protection Agency
Mandates refrigerant recovery standards, leak rate repair thresholds, and phasedown protocols transitioning from R-410A to A2L alternatives.
Performance Rating of Unitary Air-Conditioning & Air-Source Heat Pump Equipment
Air-Conditioning, Heating, and Refrigeration Institute
Defines the test procedures for SEER2, EER2, and HSPF2 energy efficiency ratings under standard M1 static pressure testing.
International Energy Conservation Code â Residential & Commercial
International Code Council
Specifies prescriptive and performance-based building envelope insulation levels (R-values, continuous exterior insulation, and assembly U-factors).
Reference Fluid Thermodynamic and Transport Properties Database
National Institute of Standards and Technology
Provides high-accuracy pressure-temperature-enthalpy polynomial fits for single-component refrigerants and non-azeotropic zeotropic mixtures.
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