I do not like underfloor heating. I fitted it in schools many years ago. Heating would be set to come on 90mins before school opened, it had to warm up the concrete floor. 9.00am, in come 30 children, within 30 mins classroom windows would be wide open because of lack of control of room temp. I see the same thing happening in a greenhouse when the sun comes out. Skirting heating seems a better idea.
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