It is a feature found on particular models for specified conditions. Its presence, purpose and correct use must be confirmed in the exact instructions.
What the observation tells you
A similar-looking switch may instead control another function. Applying advice for an older appliance to a newer one can create unintended settings. A winter feature also does not automatically authorise any outbuilding temperature or damp environment.
A useful next step
Identify the full model and the switch label before using it. Record the room conditions and both compartment symptoms. If the feature is absent, do not attempt to recreate it by altering wiring or heating the interior.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.