As has been argued for many years, the light load on the boiler and the dry basements are only a few of the advantages of year round operation. Obviously it is a great time to clean and lubricate, and replace anything needed, but take it from someone who has burned year round for 48 years now, the advantages FAR outweigh the small amount of coal used. Having the boiler 'at temperature' all the time is a no brainer. If you are so cheap as to think you'll save money with some other means of heating for a few months, then you are not a part of this discussion. Common sense far over-powers the 'bean-counter' in most of us. Try letting a vehicle sit idle for 4 months and then want to fire it up for 100% duty.
Last summer a neighbor walked into my garage on a 95 degree day......and he freaked out when the AA started stoking. He thought I was off my rocker, until I asked him what the garage temp was vs the outside temp. Two thermometers read 95 inside, 95 outside. However on a frosty morning in July (41 degrees), the garage was 68 inside, the basement was 68 (and stays there), so what is the harm.