In article ,
Velvet writes:
Hmm! Is this why the edge of my ff is warm to the touch in summer? front
edge of side wall, but different levels of heat depending on where you
put your hand in a vertical line up the corner (if that makes sense)?

Yes. Sometimes it's an electric element (possibly with a switch),
and sometimes it's one of the warm refrigerent pipes routed
just under the surface.

--
Andrew Gabriel