Idea/Suggestion: change color scale

The current map does a great job of highlighting areas where a high percentage number of households are "cost-burdened". The generally accepted measure of affordability seems to 30%, which you are using as a benchmark. The current color scale goes from white to dark blue to denote the percentage of people who are cost-burdened. Using a color like red, which is universally associated with "danger", "warning", etc, might help communicate that these areas have an affordability problem.