# Ironbug Existing Building Modelling

**URL:** <https://discourse.ladybug.tools/t/ironbug-existing-building-modelling/14568>\
**Category:** ironbug\
**Tags:** honeybee, energy\
**Created:** [May 22, 2021, 12:09pm UTC](https://discourse.ladybug.tools/t/ironbug-existing-building-modelling/14568 "2021-05-22T12:09:14Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![btanriverdi](https://discourse.ladybug.tools/letter_avatar_proxy/v4/letter/b/eb8c5e/32.png) [@btanriverdi](https://discourse.ladybug.tools/u/btanriverdi)\
**Post date:** [May 22, 2021, 12:09pm UTC](https://discourse.ladybug.tools/t/ironbug-existing-building-modelling/14568/1 "2021-05-22T12:09:14Z")

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Hi all,

I’m trying to do an HVAC system comparison for an existing building in detail with Ironbug. I’ve got the hourly demand data of both heating and cooling for a whole year.

Is there a way to introduce this data set as a demand rather than modelling the whole building from scratch?

Best regards,  
Baran