Comparison table

Features	Standard	Expert
Multi-zone, whole-building energy and carbon emission analysis
Dynamic cooling and heating load calculation
System and plant sizing
Thermal comfort analysis using view factors (PPD, operative temperature, EN15251)
Daylight computation
Solar penetration and shading animation
Natural and mixed mode ventilation (bulk air flow model)
Hydronic radiators, chilled beams and panels
3D visualization of input and results
3D real-time animation of results
Variable timestep solver (sub-second resolution)
Fully transparent model (log any variable)
Multiple natural languages
Early Stage Building Optimization wizard (ESBO) with renewable energy components such as solar collectors, stratified tanks, boreholes, heat pumps, PV, wind turbines, CHP etc. (beta)
Build free schematics of HVAC, control and envelope objects
Editable AHUs and plants
Replace default plant with ESBO plant
Write your own models using NMF, Neutral Model Format (similar to Modelica)
Version handling system (manage multiple case versions with automatic batch updates)
Full scripting language
Model difference listing
Model search
File comparison functions
Outline view
Editable GUI forms
IDA Simulation Environment (write your own component models)

¹ Extension can be purchased separately