To investigate the impacts of an energy efficiency retrofit, indoor air quality and resident health were evaluated at a low‐income senior housing apartment complex in Phoenix, Arizona, before and after a green energy building renovation. Indoor and outdoor air quality sampling was carried out simultaneously with a questionnaire to characterize personal habits and general health of residents. Measured indoor formaldehyde levels before the building retrofit routinely exceeded reference exposure limits, but in the long‐term follow‐up sampling, indoor formaldehyde decreased for the entire study population by a statistically significant margin. Indoor PM levels were dominated by fine particles and showed a statistically significant decrease in the long‐term follow‐up sampling within certain resident subpopulations (i.e. residents who report smoking and residents who had lived longer at the apartment complex).

My Barrett Honors Thesis focuses on answering the question of whether a current owner of a single family home in Tempe, Arizona would receive an adequate return on investment (“ROI”) to justify adding an accessory dwelling unit (“ADU”) on their property for the purpose of generating rental income and capital appreciation. I focused my research on Tempe’s zoning regulations, ADU general contractor (“GC”) options, possible parcels, proposed construction plans and budget, and lastly, a pro forma to determine ROI. After conducting the research, discussing with several GCs, and modeling returns, I determined that unlevered ADU development constitutes a novelty, not a solid investment choice with today’s market conditions. Factors that would change this recommendation decision would include a decrease in interest rates or a tempering of construction costs.