New window systems must comply

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As with any capital improvement, aesthetic appeal is also a driving force. New windows can add equity to a commercial property, and also present a way to dramatically improve the building’s appearance.

Energy efficiency is not often a precipitating factor in the decision to replace aging windows. However, once user comfort, maintenance demands, and aesthetics conspire to make window replacement unavoidable, a window project offers the opportunity to improve energy efficiency and reduce operating costs. Whether owners pay for these expenses themselves or pass them along to tenants, energy savings can be a compelling consideration when designing new windows.

with the requirements of the local code governing that jurisdiction. Any code rcs data that has adopted the International Energy Conservation Code (IECC) as 
a foundation also, by extension, uses a version of American Society of Heating, Refrigerating, and 
Air-conditioning Engineers (ASHRAE) 90.1-2013, Energy Standard for Buildings Except Low-rise Residential Buildings, as a reference standard. However, IECC identifies its own path to compliance, and adopting municipalities often further modify those requirements to meet their own, local needs.