In article chris French
wrote:

The 'forgotten what it's called' wireless stat and rad valve system from
Honeywell, claims to sense when the windows has been opened and to not
open the valve

CM-zone.

Apparently it's designed to recognise sudden drops in temperature and assume
they're due to a door or window being opened. I think it only applies the
cutout for a limited time though and I'm not sure if it actually cuts the
heat or just refuses to increase it.

--
Mike Clarke