I just found a bad design in a new home.
Elevated slab at rear. (slabs are not insulated around here)
Master bath has a toilet room at the downstairs right rear corner with two exterior walls and a window with a tile floor.
Ceiling register has the typical “low flow” setup for a small room (room approx 3x6)
This little toilet room was like an ice box, nothing was unusual as viewed with the IR camera except the slab was very cold not only at the edges but into the room a few feet.
The door was open and the heat was running. This little room would need triple the airflow at least to overcome the items listed above.
To make it worse, home is in a retirement neighborhood.
What do you think the builder will do about it?