The first important measure for prolonging the furnace life is correct operating principle.

确保高炉长寿的首要措施是正确的操作制度。

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The lifetime of blast furnace hearth and bottom is the restricted link of blast furnace life.

高炉炉缸炉底的寿命是高炉本体寿命的限制性环节。

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The hearth and hearth bottom life of blast furnace is one of the key factors affecting blast furnace life.

高炉炉缸和炉底的寿命是影响高炉长寿的关键因素之一。

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Over the life of a new furnace, the big dollar savings will be in your heating bill, not your tax return--particularly if you live in a cold climate.

FORBES: Energy Tax Breaks: About To Expire

You also should have enough to cover life's inevitable, unanticipated expenses, like a leaky roof or dead furnace not just in your primary home but also in all of your investment properties (which likely suffered abuse and neglect on their way to becoming bargains).

WSJ: Breaking the Home-Buying Habit -- WSJ House Talk