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Guidance

Home Energy Model: Future Homes Standard assessment: technical documentation

Technical documents providing detail on the Home Energy Model: Future Homes Standard Assessment methodology.

Updates to this page

From:
Department for Energy Security and Net Zero
Published:
13 December 2023
Last updated:
24 March 2026
Show all updates

  1. All technical documents now published to reflect changes in the methodology since the Home Energy Model: Future Homes Standard consultation. For further details see the government response to the consultation.

  2. First published.

Documents

HEMFHS-TP-01: Summary of the FHS assessment wrapper for the Home Energy Model

PDF, 528 KB, 14 pages

HEMFHS-TP-02: Occupancy assumptions in the Home Energy Model

PDF, 1.63 MB, 29 pages

HEMFHS-TP-03: Space heating and cooling assumptions in the Home Energy Model

PDF, 337 KB, 15 pages

HEMFHS-TP-04: Hot water usage assumptions in the Home Energy Model

PDF, 826 KB, 35 pages

HEMFHS-TP-05: Lighting, cooking, electrical appliances, and incidental heat losses in the Home Energy Model

PDF, 1 MB, 41 pages

HEMFHS-TP-06: Modelling ventilation and infiltration within the Home Energy Model

PDF, 300 KB, 12 pages

HEMFHS-TP-07: Calculating cold water and evaporative losses within the Home Energy Model

PDF, 566 KB, 17 pages

HEMFHS-TP-08: Modelling curtains and blinds within the Home Energy Model

PDF, 324 KB, 9 pages

HEMFHS-TP-09: Fuel factors within the Home Energy Model

PDF, 411 KB, 19 pages

HEMFHS-TP-10: Standardised weather data for the FHS wrapper

PDF, 675 KB, 18 pages

Details

We will update and add to this technical documentation throughout the model development process.

These technical documents have been published alongside:

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