As a frigid winter wind kicks in, a properly functioning furnace becomes more of a necessity than an extravagance. Most homeowners think: Is my furnace working? This fleeting thought hits even fewer with the heavy financial implications it bears. An adequately serviced furnace sums up comfort and safety, which is a huge savings over time. Savings accrue by way of reduced energy bills and late, costly repair costs. Therefore, the regular maintenance of a furnace is a smart and economic investment.