The heating and cooling systems, including the four geothermal wells, for example, cost about $100, 000 (an amount reduced somewhat by a federal tax credit and a state rebate).

保暖和冷气系统，包括四面发热墙，花费10000美金（已扣除联邦退税和当地州的退税）。

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For one thing, there's disagreement over how much it should cost for the Capitol Power Plant--which provides heating and cooling power to Congress--to use cleaner-burning natural gas instead of coal power.

FORBES: The Greening Of The Hill