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Image: reddit.com · Smart Cooling Custom Integration - looking for beta testers...

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A room temperature prediction integration for Home Assistant, by Claude

Claude Sonnet 4.6 turned an unmanageable 800-line template sensor into a 5,000-line integration that predicts bedroom temperature and advises on windows, fans or AC.

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Credits

  • Reddit poster murran_buchstanseger Source ↗
  • Repository account markaggar Source ↗

Earliest dated source: 5 Apr 2026

Code ↗

The full story

The owner wanted Home Assistant to predict their bedroom temperature from the weather forecast and suggest when to open windows, run window fans or turn on the air conditioning, to avoid running the AC needlessly. An earlier attempt with Claude on the web produced an 800-line template sensor that was too hard to modify and debug, so they gave up.

Later they had Claude Sonnet 4.6 in VS Code turn that sensor into a custom integration of more than 5,000 lines, and were impressed by the improvement. It was not yet warm enough locally to test it properly, so they published it and asked others to report how well it predicts temperatures after a week of learning.

How it was done

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Sources

From a short post by the maker, so the details are as they tell them.

  • Reddit: Smart Cooling Custom Integration - looking for beta testers...Forum threadreddit.com
    Reddit poster: murran_buchstansegerPosted 5 Apr 2026

    The maker's post on r/homeassistant.

    If it disappears: archived copy of Reddit: Smart Cooling Custom Integration - looking for beta testers... (opens in a new tab)

  • The code: github.comCode or repositorygithub.com
    Repository account: markaggar

    Linked in the post.

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