 This research paper examines the relationship between historical housing policies and current patterns of intra-urban heat. It found that 94% of studied areas displayed consistent city-scale patterns of elevated land surface temperatures in formerly red-lined areas relative to their non-red-lined neighbors by as much as 7 degrees Celsius. Additionally, it was observed that southeast and western cities display the greatest differences while Midwest cities display the least. Finally, nationally, land surface temperatures in red-lined areas were found to be approximately 2.6 degrees Celsius warmer than in non-red-lined areas. This article was authored by Jeremy S. Hoffman, Vivek Shandiz, and Nicholas Pendleton.