Top 10 Best Hvac Calculator Software of 2026

Right-Suite Universal by Wrightsoft is a comprehensive HVAC design and sales software suite tailored for residential and light commercial projects. It performs ACCA-approved Manual J load calculations, Manual D duct design, Manual S equipment selection, and includes 3D modeling, plan takeoff, and proposal generation tools. Widely regarded as the industry gold standard, it streamlines the entire process from site survey to final sales presentation with high accuracy and efficiency.

Hourly Analysis Program (HAP) from Carrier is a professional-grade HVAC software for detailed hourly load calculations, energy analysis, and system sizing in commercial and institutional buildings. It uses the DOE-2.1E simulation engine to model whole-building performance, including weather data integration, psychrometric processes, and equipment selection. HAP supports compliance with ASHRAE standards and provides comprehensive reports for design validation and energy optimization.

TRACE 3D Plus is a comprehensive building energy modeling and HVAC design software from Trane Technologies, used for detailed whole-building simulations, load calculations, and system sizing. It features an integrated 3D modeling environment for geometry creation, supports hourly energy analysis, and optimizes HVAC systems for energy efficiency and compliance with standards like ASHRAE 90.1. Ideal for commercial and institutional projects, it integrates with BIM workflows and provides actionable insights for design decisions.

Elite RHVAC from Elite Software is a professional desktop application designed for residential HVAC load calculations, duct design, and equipment selection, fully compliant with ACCA Manual J 8th Edition standards. It provides detailed psychrometric analysis, zone-by-zone heat gain/loss computations, and generates comprehensive reports for permitting and client presentations. The software supports advanced features like infiltration modeling and ventilation calculations, making it a robust tool for precise system sizing.

CoolCalc is a cloud-based HVAC load calculation software specializing in ACCA-approved Manual J, D, and S calculations for residential and light commercial buildings. It enables users to input detailed building geometry, insulation, and occupancy data to generate precise equipment sizing and professional reports. The platform emphasizes speed and accuracy, reducing calculation times from hours to minutes compared to manual methods.

EnergyGauge USA is a professional-grade residential energy analysis software designed for HVAC load calculations, whole-building energy simulations, and code compliance reporting. It performs ACCA-approved Manual J heating/cooling load calculations, duct design per Manual D, and 8760-hour annual energy modeling compliant with IECC, ENERGY STAR, and RESNET standards. Widely used by HVAC contractors, builders, and certified energy raters, it generates detailed reports for permitting and certification.

Loadsoft from Carmelsoft is a Windows-based desktop software specializing in residential HVAC load calculations, fully compliant with ACCA Manual J 8th Edition for precise heat gain and loss analysis. It enables detailed input of building geometry, insulation, infiltration, internal loads, and duct systems to size heating and cooling equipment accurately. The tool generates professional reports for design, permitting, and client presentations, making it a staple for HVAC professionals focused on residential projects.

LoadCalc.net is a cloud-based HVAC load calculation tool specializing in ACCA Manual J compliant calculations for residential and light commercial buildings. Users input detailed parameters like building geometry, insulation, windows, infiltration, and internal loads to generate precise heating and cooling load reports. It produces professional PDF outputs suitable for equipment sizing, permitting, and client presentations, all accessible via web browser without software installation.

EnergyPlus is an open-source whole-building energy simulation program developed by the U.S. Department of Energy, designed to model heating, ventilation, air conditioning (HVAC), lighting, and other energy flows in buildings with high accuracy. It performs detailed dynamic simulations to predict energy use, system sizing, and performance under various weather and operational conditions. Primarily used for design, retrofit analysis, and compliance with energy codes, it excels in complex HVAC system modeling but requires technical expertise.

CHVAC from Elite Software is a robust HVAC load calculation program that performs detailed heating, cooling, and ventilation load analyses for residential and commercial buildings based on ASHRAE standards. It supports complex modeling with multiple zones, rooms, construction types, and infiltration calculations, generating comprehensive reports for equipment sizing and energy analysis. Primarily Windows-based, it caters to professional engineers needing precise, code-compliant results.