HEM User Guides updated

A fresh set of Home Energy Model User Guides have been published - this will be particularly useful for manufacturers of domestic heating, cooling, hot water, ventilation and renewable systems.

The HEM Technical Guidance explains how the core engine works. This will be too detailed for most users to care about, but provides clear explanations just in case you need it.

Looking under the bonnet of the HEM Engine helps us assessors better understand why results are what they are, and explains the calculation steps so manufacturers can sense-check the way HEM processes their data.

🔗 https://www.gov.uk/government/publications/home-energy-model-technical-documentation

These new documents explain how HEM treats each system, how energy use is calculated, and how this interacts with other modules of the HEM Engine. It's a proper brain-fryer (for me, anyway!) 🤯 and shows just how much of an upgrade this is compared to SAP.

HEM is still a work-in-progress, and we won't be able to generate results to the Future Homes Standard until the summer. Using HEM for calculating running costs and Energy Performance Certificates won't be possible until 2027.

But we don't have to wait that long to get stuck into FHS (or so we're told!). The new Approved Document Part L and SAP10.3 should be published in the coming weeks.

I apologise in advance for the barrage of posts I'll be throwing at your feeds when that happens! 😁