{'fraction_non_alphanumeric': 0.01910828025477707, 'fraction_numerical': 0.0, 'mean_word_length': 5.875, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Saving Windows, Saving Money: Evaluating the Energy Performance of Window Retrofit and Replacement

A report produced by the Preservation Green Lab, a project of the National Trust for Historic Preservation, offers insight for homeowners weighing the financial and energy tradeoffs between replacing or repairing older, less efficient windows. This analysis, Saving Windows, Saving Money: Evaluating the Energy Performance of Window Retrofit and Replacement, builds on previous research by examining multiple window improvement options, comparing them to replacement windows across multiple climate regions. 
 
This report, made possible through the generous funding of the National Center for Preservation Training and Technology, concludes that a number of existing window retrofit strategies come very close to the energy performance of high-performance replacement windows at a fraction of the cost. Saving Windows, Saving Money’s key findings offer homeowners, contractors, architects and others with compelling evidence of the merits of retrofitting windows as opposed to outright replacement.