Why does the furnace stop while a bedroom still feels cold?
The thermostat may reach its target while another room remains uncomfortable. That differs from a shutdown while heat is still requested. Control location, air delivery and equipment behavior need to be separated.
Compare the control area with the cold room
At the end of a normal run, note whether the room reading has reached the target. List the rooms that still feel cold. Do not keep raising the target just to force the system to run longer.
Look for sun, a nearby heat source or a draft at the thermostat. They can affect its reading. Note the time and condition without moving the control or changing installer settings.
Separate two stopping patterns
If the control reaches its target, ask why that space warms while another room stays cold. If it still asks for heat but the furnace keeps stopping, the heating cycle itself may be interrupted.
This does not prove the cause. It gives the check a better starting point than run time alone. If repeated early stops continue, switch the system off at the thermostat and seek qualified help. Do not try to override the stop.
Request a scope that matches the room problem
Ask if the work will address the reading, how air reaches rooms or an internal fault. One cold bedroom does not justify a larger furnace or new control on its own.
Tell us about separate room controls and any limits on their use. Give the Golden Gate address and state who can approve entry. If duct work is proposed, ask about access and the full scope before you agree.
More about this heating problem
Should I close the warm room's vent?
Do not use widespread vent closure to extend a heating run. It can restrict airflow. Report the warm and cold areas so the cause can be evaluated.