Top 10 Best Heat Load Software of 2026

Wrightsoft Right-Suite Universal is a comprehensive HVAC design software suite that excels in performing ACCA-approved Manual J heat load calculations, Manual S equipment sizing, and Manual D duct design for residential and light commercial projects. It integrates takeoff drawings, 3D modeling, equipment selection from a vast database, and proposal generation into a single platform, streamlining the entire design-to-sale process. Widely regarded as the industry gold standard, it ensures compliance with ASHRAE and ACCA standards while minimizing errors through automated workflows.

Elite Software RHVAC is a professional-grade residential HVAC load calculation program that performs precise heating and cooling load computations in full compliance with ACCA Manual J 8th Edition standards. It supports detailed input of building geometry, construction assemblies, windows, doors, and internal loads across multiple zones and stories. The software generates comprehensive reports, sizing recommendations, and integrates with Elite's duct design and equipment selection tools for streamlined workflows.

CoolCalc is a cloud-based HVAC heat load calculation software tailored for residential projects, performing precise calculations compliant with ACCA Manual J 8th Edition, ASHRAE, and other standards. It allows users to input building geometry via 2D/3D drawing tools, aerial imagery, or manual entry, automatically computing heating and cooling loads. The platform generates detailed, customizable reports for equipment sizing, code compliance, and client presentations, with real-time collaboration features.

Carrier HAP (Hourly Analysis Program) is a robust desktop software from Carrier for HVAC professionals, specializing in detailed heating and cooling load calculations, energy analysis, and system sizing for commercial buildings. It employs ASHRAE-compliant methods like the Heat Balance approach for precise, zone-by-zone simulations over hourly periods. The tool also supports economic comparisons, equipment selection from Carrier catalogs, and comprehensive reporting for design validation and code compliance.

Carmel Loadsoft is a Windows-based desktop software specializing in precise heating and cooling load calculations for residential and light commercial buildings, adhering strictly to ACCA Manual J 8th Edition standards. It enables detailed input of building envelope, infiltration, internal gains, and ventilation to generate accurate equipment sizing reports. The tool supports both sensible and latent load breakdowns, making it reliable for HVAC design professionals.

Trane TRACE 3D Plus is an advanced 3D building energy modeling software from Trane Technologies, primarily used for detailed HVAC load calculations, energy simulations, and system sizing in commercial and institutional buildings. It enables engineers to create precise 3D models, perform room-by-room heat load analysis using ASHRAE-compliant methods, and simulate annual energy performance with hourly resolution. The tool integrates seamlessly with Trane's equipment library for optimized system design and supports import from BIM tools like Revit.

EnergyPlus is an open-source whole-building energy simulation engine developed by the U.S. Department of Energy, capable of modeling heating, cooling, ventilation, lighting, and other energy flows with high accuracy. For heat load calculations, it employs a detailed heat balance method to simulate zone loads, peak demands, and system interactions dynamically over time. While overkill for simple steady-state heat load estimates, it excels in complex, transient analyses integrated with full energy modeling.

eQuest, available at doe2.com, is a free whole-building energy simulation software powered by the DOE-2.2 engine, designed for detailed modeling of heating, cooling loads, and overall energy performance. It supports complex building geometries, zoning, HVAC systems, and schedules to perform hour-by-hour dynamic simulations, making it suitable for peak load calculations and energy code compliance like California's Title 24. While powerful for comprehensive analysis, it's often overkill for simple steady-state heat load tasks.

Cove.tool is a cloud-based building performance analysis platform with a dedicated Cove.Loads module for ASHRAE-compliant heating and cooling load calculations. It integrates seamlessly with BIM tools like Revit, Rhino, and SketchUp to import geometry and perform rapid simulations using the EnergyPlus engine. The software supports early-stage design optimization for HVAC sizing and provides detailed reports for code compliance.

IESVE (Integrated Environmental Solutions Virtual Environment) is a sophisticated building performance simulation platform that excels in dynamic thermal modeling, including detailed heat load calculations for HVAC sizing. It integrates modules like Apache for steady-state and transient heat load analysis, supporting whole-building energy simulations, peak load predictions, and compliance with standards like ASHRAE 90.1. While powerful for complex projects, it's more than just heat load software, offering daylighting, CFD, and sustainability analysis in a unified environment.