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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
Cooling Load Calculator
Manual J Method
Calculate sensible and latent cooling loads
Heating Load Estimator
Heat Loss Calculation
Estimate heating requirements for buildings
Multi-Building Heat Load
Portfolio Analysis
Calculate and compare cooling loads for multiple buildings
Multi-Room Heat Load
Inter-Room Transfer
Full building analysis with inter-room heat transfer
Multi-Building Heating
Portfolio Analysis
Calculate and compare heating loads for multiple buildings
Multi-Room Heating
Inter-Room Transfer
Full building heating analysis with inter-room transfer
Psychrometric Calculator
Air Properties
Calculate air properties and humidity ratios
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
Understanding Cooling Load Calculations: A Complete Guide
Learn the fundamentals of cooling load calculations, including Manual J methodology, sensible and latent loads, industrial process loads, and how to properly size HVAC systems for commercial and industrial applications.
Multi-Building Heat Load Analysis: Portfolio Management
Discover how to analyze cooling loads across multiple buildings for campus planning, commercial complexes, and portfolio optimization.
Complete Guide to Air Changes per Hour (ACH): Calculation Methods and Applications
Master the fundamentals of Air Changes per Hour calculations, including measurement techniques, design standards, and practical applications for HVAC system design.
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