A trap that's leaking steam can cost hundreds of dollars in energy each year. Inspect the traps every fall before the beginning of the heating season.
Periodically inspect and listen to the automatic steam control valves for a leakage when the valve is closed.
Insulate the steam and hot water pipes. It will eliminate unwanted waste of heat and energy dollars.
Keep track of how much energy you normally use under varying conditions. When the usage doesn't fit the condition, something may be malfunctioning.