During winter, if comfort in the house seems inconsistent, it may be necessary to take extra steps to heat freezing rooms that are stubbornly cool.
A certain room may not gain enough weekly sunlight exposure, or insufficient attic insulation can cause that area of the house to not hold heat efficiently.
Obviously, rooms situated on a wing, separated from other living spaces, and not getting their even-handed share of heat will remain cold. There are several reasons why a room or rooms may not perform well when it comes to comfort. It applies to the vents in the colder rooms, plus all other rooms in the house. When registers are closed in certain rooms and left open in others, the furnace airflow through household HVAC duct may be unbalanced, resulting in some rooms receiving insufficient heat. Replace worn weatherstripping if necessary if freezing air is intruding around windows. Check for cracks at the joint between the walls and ceiling or along the baseboards that may allow unconditioned air in. Silicone caulking can be used to seal these cracks. Depending on where the plan thermostat is situated, other parts of the house may have chronically low temperatures if it is situated in a area of the house that is typically warm. If necessary, relocate the thermostat to an area where the temperature is representative of the entire house, rather than close to a heating vent or in direct sunlight. Consider adding a room-to-room ventilator if an adjoining room is usually warm, however the next door room is cold. They install into the wall between more than one rooms and move heat from the warmer room into the colder one. With a thermostat so they only run when needed, room-to-room ventilators can be installed for as little as $100.