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Professional engineering calculators for HVAC design, refrigeration systems, and indoor air quality analysis. Get accurate results with step-by-step calculations following industry standards.

Professional Engineering Tools

Built for HVAC professionals, engineers, and technicians who demand accuracy and reliability

Professional Calculations

Industry-standard formulas following ASHRAE, Manual J, and other recognized engineering practices

Accurate Results

Precise calculations with step-by-step breakdowns and LaTeX-formatted mathematical expressions

Unit Flexibility

Switch seamlessly between Imperial and SI units for global engineering compatibility

Popular Calculators

Quick access to our most frequently used engineering tools

Advanced Building Analysis Tools

Comprehensive multi-building and multi-room calculators for complete portfolio and full building analysis

Multi-Building Analysis

Calculate and compare loads for multiple buildings simultaneously. Perfect for campus planning, commercial complexes, and portfolio analysis.

  • Aggregate portfolio analysis
  • Building comparison charts
  • CSV import/export

Multi-Room Analysis

Full building analysis with inter-room heat transfer through walls, floors, and ceilings. Calculate loads for multiple zones with room-to-room heat transfer.

  • Inter-room heat transfer analysis
  • Wall, floor, and ceiling transfer
  • Full building zone analysis

Latest Engineering Articles

Learn from expert guides, tutorials, and best practices for HVAC design and engineering

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