41.   A Fire Department spokesman, Paul Iannizzotto, said that a faulty heating system had caused carbon monoxide levels to soar in the basement.

42.   A heating system is classified by the medium that transfers the heat from the furnace through the house.

43.   A last resort is to upgrade the heating system to a bigger one.

44.   A less expensive heating system add-on that comes with a similar money-back guarantee is MicroTherm, a product manufactured in Manchester, N.H.

45.   A radiant heating system was installed in the reserved-seating area, but it rarely worked.

46.   A. Because the chimney of your hot-water heating system is far away from your apartment, one would think that a CO detector is not needed.

47.   A. The advantage of having your ducts cleaned is that your hot-air heating system is cleaner than before.

48.   A. The kind of heating system has little to do with the production of dust.

49.   A. There is little you have to do, just as there is little you have to do with any hot water heating system.

50.   A. Yes it would, but it has to be hooked up to a hot water heating system.