Top 10 Best Energy Auditing Software of 2026

DesignBuilder is a leading building energy modeling software that provides an intuitive 3D graphical interface for creating detailed models and performing accurate dynamic energy simulations using the EnergyPlus engine. It excels in energy auditing by enabling rapid assessment of building performance, identification of energy-saving opportunities, and compliance with standards like LEED, BREEAM, and Part L. Users can visualize results through interactive charts, 3D animations, and comprehensive reports, making it ideal for retrofits, new builds, and certification processes.

IESVE (Integrated Environmental Solutions Virtual Environment) is a powerful building performance simulation platform designed for detailed energy modeling, thermal analysis, and environmental assessments. It excels in energy auditing by enabling users to create calibrated models of existing buildings, simulate energy use, and evaluate retrofit strategies for optimization and compliance with standards like ASHRAE and LEED. The software integrates multiple simulation engines for whole-building performance analysis, from energy consumption to daylighting and airflow.

OpenStudio is an open-source software platform developed by NREL for creating, simulating, and optimizing building energy models using the EnergyPlus engine. It supports detailed whole-building energy audits by modeling geometry, systems, schedules, and weather data to identify inefficiencies and test retrofit scenarios. The tool excels in advanced simulations for compliance, optimization, and research, with a SketchUp plugin for intuitive geometry input.

eQUEST is a free, advanced whole-building energy simulation software based on the DOE-2.2 engine, designed for modeling and analyzing energy performance in commercial buildings. It supports energy auditing by providing detailed hourly simulations of HVAC, lighting, envelope, and occupancy loads, generating reports for code compliance like ASHRAE 90.1 or Title 24. The tool features a wizard-based CHEETAH interface for quicker setup alongside full manual input for precision.

EnergyPlus is a state-of-the-art, open-source whole-building energy simulation software developed by the U.S. Department of Energy for modeling building energy consumption, HVAC systems, lighting, and envelope performance. It excels in detailed simulations using input description files (IDF) to predict hourly energy use under various weather conditions and scenarios. In energy auditing, it supports baseline modeling, retrofit analysis, and compliance with standards like ASHRAE 90.1 by providing precise predictions of energy savings potential.

EnergyPro is a specialized energy modeling software tailored for building energy compliance, particularly California Title 24 and ASHRAE 90.1 standards. It performs detailed whole-building simulations for residential and non-residential projects, generating HERS ratings and automated compliance documentation. Ideal for energy auditors needing precise load calculations and performance modeling to meet regulatory requirements.

Right-Suite Universal from Wrightsoft is a comprehensive desktop software suite for HVAC professionals, specializing in accurate residential load calculations, system design, and energy analysis. It performs ACCA-compliant Manual J heat load calculations, Manual D duct design, Manual S equipment selection, and energy simulations to assess building performance and efficiency. The tool integrates drawing, modeling, and reporting features, making it suitable for detailed energy audits and right-sizing HVAC systems.

REM/Rate is a professional-grade energy modeling software designed for residential energy audits and Home Energy Rating System (HERS) certifications. It enables detailed simulations of home energy performance by inputting building characteristics, HVAC systems, and efficiency measures to calculate HERS Index scores, predict savings, and generate compliance reports for mortgages and incentives. Widely used by certified raters, it supports pre- and post-retrofit analysis with validated algorithms approved by RESNET.

Carrier HAP (Hourly Analysis Program) is a specialized software for HVAC system design and energy modeling, performing detailed hourly simulations of heating, cooling, and energy consumption in buildings. It supports load calculations, equipment sizing, and energy cost analysis using extensive weather data and ASHRAE-compliant methods. Primarily aimed at engineers, it's useful for energy auditors needing accurate baseline simulations to identify inefficiencies in commercial HVAC systems.

TRACE 3D Plus, developed by Trane Technologies, is a sophisticated whole-building energy modeling and simulation software primarily used for HVAC system design, energy analysis, and performance optimization. It excels in creating detailed 3D models of buildings to simulate hourly energy use, evaluate retrofit measures, and identify energy savings opportunities, making it suitable for energy auditing in commercial and institutional settings. The tool supports standards like ASHRAE 90.1 and integrates Trane's extensive equipment library for precise simulations.