The New York City Housing Authority (NYCHA) provides public housing in New York City. Nearly 70% of greenhouse gas emissions in the city come from buildings, as as the largest landlord in the city, NYCHA is a major contributor to these emissions. At the same time, NYCHA buildings are in need of $32 billion of repairs, over 30% of which are for building components that can be improved to increase insulation, reducing heating and cooling demands. I proposed a two-prong approach to improve insulation of roofs and windows, the most expensive aspects of NYCHA buildings not already upgraded.