That is probably cutting it too fine if there is an extended period of cold with penetrating frost and/or strong winds.
I suppose you could use this to give it a boost on particularly chilly nights. Our frost stat in the loft triggers on the coldest nights too.
It is a sign that the thick loft insulation is working well, but it could also mean that any exposed pipes are in danger of freezing particularly if any bare metal at all is exposed to drafts.
And how accurate is the stat? And what is its hysteresis?
NT
Wireless thermostat set to frost protection (5C?) in the coldest room in the house (in my case the kitchen). Worked fine while I was working away one winter. In certain foreign areas the central heating is on an external frost stat. When the outside air temperature drops below 4C the heating turns on. Mind you in those foreign parts temperatures of -25C are not uncommon.
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