OP
Ashleynorris
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If the place has been empty and unheated it will definitely take a long time to warm back up. Then once warmed, it should be a lot easier to keep warm.
I'd suggest 15c isn't enough to bring everything back up, especially given just how very cold it is and has been recently.
Maybe get some dodgy local character to hook you into a street light nearby? That would save a few quid!
(...joking btw)
Yes the property was empty for some months before we purchased it everything Was turned off even the mains water and a window was left open.we to thought the same it just needs time to heat back up and it'll sort itself out. Do you suggest tuning it all on and up for a day or.so just to heat the property right up and go from there. 25degress on each thermostat for 24hrs??