IES Virtual Environment IESVE 2025

IES Virtual Environment 2025: Building Performance Analysis Software

IESVE 2025 is the latest release of IES's integrated building performance analysis software, launched in June 2025 with two Feature Packs (FP1 in October 2025, FP2 in March 2026). It delivers smarter HVAC modelling, thermal bridging analysis, PCM ceiling simulation, parametric analysis, and enhanced decarbonization tools .

Key New Features in 2025

Building Envelope & Thermal Bridging

• Psi/Chi Thermal Bridging: Model thermal bridges using Psi and Chi values alongside existing Y-value and % increase methods; supports NECB, ASHRAE 90.1, UK Part L

• Armstrong PCM Ceilings: Exclusive simulation of Templok® Phase Change Material ceiling tiles for passive thermal energy storage; up to 15% energy cost reduction validated

HVAC & Central Plant

• HARC System Simulation: Intuitive modelling of Heat Acquisition & Rejection Coils for hospitals, labs, and complex facilities

• Automated Equipment Sequencing: New automatic optimisation of part-load equipment transitions for cooling systems

• Electrically Heated Stratified Tanks: Hot water storage tank modelling for decarbonization workflows

• Heat Pump Curve Tool: Spreadsheet tool converting manufacturer data into accurate performance curves

Parametric Simulation

• Faster Multi-Scenario Testing: Early-stage design evaluation with greater speed, scope, and insight

• Schedule Loads for CHWL: Represent scheduled loads using real data or design values for chilled water loops

Code Compliance & Electrification

• Title 24 (2025) Updates: Approved for California's 2025 energy code cycle; enhanced electrification features

• EV Charging Integration: Automatically captures EV charger impact on total building energy use

• Stratified Water Tank Modelling: New tank stratification capabilities

Climate Resilience & IAQ

• Climate Assessment Report: One-click model-free climate insight directly within APLocate

• Vietnam IAQ Standards: Featured as primary simulation tool for TCVN 13521:2022 compliance