Warm up time is easily managed by setback / advance of heating on / off sets points, so don't get hung up on those. The issue is with folk who are not conversant with these 'technologies' stating Chinese whispers and causing undue worry amongst folk who hang on those 'professional opinions', howsoever generalised ( or even flawed ).   If you are building to a good standard ( our UK building regs are utter ? so please don't go by those ) then your home will never actually go 'cold' ergo you
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