My close family are staying in a nearby holiday cottage over Christmas
the holiday home is newly modernised with actual insulation and triple glazing 
We live in a 200 year old draughty cottage
We've been to tea with them tonight & they had the heating set at 28 radiators too hot to touch under floor heating on and gas fire on full (open plan downstairs)
My heating is set at 18 at home
We literally melted & we had to leave very rapidly after eating as we felt so uncomfortable
so I asked could they maybe turn it down when we go there Christmas day (I'm cooking) just for a few hours
So AIBU?
They (6 of them) said it was 'cool' in the cottage & 2 were sat with blankets wrapped around them
What is the alternative? I bought a gorgeous dress today am I going to end up spending Christmas day in just my tights bra and ear rings ? 
Is that just too hot???