Final answer:
The term for the temperature difference after the thermostat opens until warm air stops being delivered is called 'overshoot,' a result of delayed stabilizing feedback in a control system.
Step-by-step explanation:
The temperature difference between the opening of the thermostat and the time when the warm air is no longer delivered to the room is called overshoot.
Definition 3.2.3 explains overshoot as a generic consequence of delayed negative feedback. The delay in feedback allows the system to exceed the target equilibrium state because the stabilizing influence is postponed, leading to a higher temperature than intended before the system stabilizes.