I just moved into a house with natural gas hot water baseboard heat. I just had the furnace “serviced” by a professional. Is there anything that I can do as a “do-it-yourselfer” to maintain the furnace in the future, besides putting a few drops of oil in the re-circulating pumps once a year?
Also, there is a brush (cylindrical, at the end of a wire) hanging on the wall next to the furnace. Is there something that I should be cleaning with this brush?