| furnace filter | 0.72 | Change the furnace filter every month. | ||
| furnace room | 0.66 | A furnace room should get as much consideration as a lobby. | ||
| furnace flue | 0.26 | Be sure to measure the furnace flue and flue liner before ordering the cover. | ||
| furnace man | 0.26 | Make note to call up furnace repair man on Monday. | ||
| furnace oil | 0.26 | It will use residual furnace oil as fuel. |