Can I reduce temperature in one room on my hot water furnace based system?
Most hot water baseboards have a &quot;flap&quot; which can be used to regulate the heat output so the system can be balanced, since there are often long runs serving multiple rooms.
The flap can be opened for maximum airflow and heat delivery, or closed to minimize airflow and heat delivery. If there is no flap, or that is inadequate to resolve the problem, you can block the airflow by other means, such as placing towels to block the airflow (on a hot water or steam system only, where there is no risk of fire from blocking the radiator.)