Nathan Kegel

Nathan Kegel is Senior Vice President at Integrated Environmental Solutions (IES), developer of IES Virtual Environment (IESVE), a physics-based building performance simulation platform used by engineering and construction teams worldwide to calculate heating and cooling loads, model energy performance, and demonstrate code compliance. Nathan works with engineering firms, contractors, and developers to integrate building performance modeling into project delivery workflows, with a focus on reducing compliance risk and improving energy performance outcomes.

The Load Calculation Standard Most Engineers Haven't Read (But Really Should)

Why most commercial load calculations fall short of the code standard that now governs them

Nathan Kegel

June 3, 2026

ASHRAE Standard 183 is now embedded in energy codes across most U.S. jurisdictions, and many engineering teams don't know their current load calculation workflows may not meet it.

On Demand As AI workloads and high-density computing push traditional cooling methods to their limits, the data center industry is accelerating the adoption of next-generation HVAC technologies.

In this session, we will cover how to design VRF systems for the U.S. market using new A2L refrigerants. These systems provide an advanced zoning solution by using inverter technology to deliver precise heating and cooling control across multiple zones and spaces.

Nathan Kegel

ARTICLES

The Load Calculation Standard Most Engineers Haven't Read (But Really Should)

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