Stewards of the iconic buildings and grounds of Capitol Hill since 1793.

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Members of the House of Representatives sit in unassigned armchairs arranged in a semicircle on tiered platforms that face the Speaker's rostrum. Behind the rostrum is a frontispiece with Ionic columns made of black Italian marble with white Alabama marble capitals. An American flag occupies the center and is flanked by two bronze faces. The chamber's lower walls are walnut paneled with intervening light grey Genevieve Sheldorado marble pilasters. A gallery for visitors and the press corps rings the chamber
The House Chamber, also known as the "Hall of the House of Representatives,"...

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A virtual Map of Capitol Hill from above
View a map of the U.S. Capitol and other buildings and grounds cared for by the...

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Photo of the East Front of the U.S. Capitol Building looking North to South.
AOC's annual Performance and Accountability Report (PAR) provides the results...

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AOC employee working on touching up columns in Statuary Hall
Next time you're in Statuary Hall on the second floor of the U.S. Capitol...

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Saving Energy, Preserving History

West Front of Capitol in March with blue skies and clouds
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Here at the Architect of the Capitol (AOC), our challenge is unique – we must maintain aging, iconic buildings while adapting to state-of-the-art technology and increasing responsiveness to environmental, security and safety considerations in a rich historical setting.

A building’s lifetime environmental impact is dependent upon everyday operations and maintenance. The AOC and its team of experts have been successful at optimizing new equipment within the framework of its historic buildings to attain substantial energy and cost savings while balancing the preservation needs of the buildings.

The AOC is proud to announce that since 2006, improvements to infrastructure and building systems have reduced energy consumption by 25 percent.

These energy savings, generated by Energy Savings and Performance Contracts, major projects and operational initiatives, equate to enough energy to power the entire United States Capitol and Library of Congress James Madison Memorial Building for a year.

This year’s long, cold winter, will challenge us to continue to meet our organizational annual energy reduction goals for Fiscal Year 2014. As we enter into spring, we will work diligently behind the scenes to continue to reduce energy consumption. These efforts will include curtailing our energy use during unoccupied hours by turning off lights and tightening control of HVAC systems in our buildings; the Capitol Power Plant will also be working on efficiency improvements. If you’re an occupant on Capitol Hill you can help by turning off equipment, space heaters and lights when they’re not needed. 

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