Cold weather problems

Our dining room is freezing cold, and the two heat registers in the floor are barely working. I have no idea why. There is no access to the dining room foundation, so I can’t diagnose the problem. It’s so cold that the room is unusable.

Cold weather also makes some things contract or settle. This means things will work differently in summer vs winter. Case in point, the bedroom doors will not close because they don’t fit inside their door frames. This indicates that the flipper installed these doors with the proper clearance.