1.   Add room thermostats, a timer, and thermostatic radiator valves.

2.   Berry said that radiator valves come with different-sized vent holes that allow for fine-tuning a heating system.

3.   Finally, it is important to open radiator valves fully.

4.   If the water level is allowed to rise, it may flood the system and trickle through the radiator air valves.

5.   Place a pan under the radiator bleed valve and open it with a radiator key.