eQUEST

eQUEST is a computer program used for building energy modeling. It provides a graphical user interface that serves as a front end to the DOE-2 energy simulation engine, enabling architects, engineers, and building operators to model the energy use of commercial and institutional buildings. The software is widely used for design optimization, performance verification, and energy code compliance assessments.

The program guides users through a workflow to create a building model, including description of the geometry, construction assemblies, internal loads, occupancy schedules, and equipment and plant systems. It includes libraries of common building elements, climate data, and system templates, and supports various HVAC configurations such as constant-volume and variable-air-volume systems. Users can perform parametric studies to compare different envelope designs, equipment selections, and control strategies, and run hourly simulations to produce detailed results.

Output from eQUEST typically includes annual energy consumption, operating costs, and utility bill projections, along with hourly or monthly energy use profiles and end-use breakdowns. The software generates reports and graphs suitable for design reviews, energy audits, and compliance submissions, and it can be used to evaluate energy conservation measures and the economic viability of different design options.

eQUEST relies on the DOE-2 energy simulation engine, which has a long history in building energy analysis. While powerful and user-friendly for its class, eQUEST is based on older simulation methods relative to newer tools such as EnergyPlus. As a result, some users migrate to newer platforms for projects requiring advanced modeling capabilities, though eQUEST remains a popular, accessible option for many standard building energy analyses.