Healthy housing interventions can yield extensive benefits by adopting a holistic and home-based approach, according to a qualitative study of people living in rental housing. Participants (n = 20) had received the Healthy House Initiative (HHI), which includes provision of items such as curtains, heaters, bedding, and insulation, advocacy to encourage landlords to install improvements, and education and advice to renters. Semi-structured, in-depth interviews revealed that participants felt heard and supported by HHI assessors. Participants reported increased warmth and dryness of their home, improved respiratory and mental health, reduced bills, and the ability to use more parts of their home. However, structural inadequacies and energy poverty meant some participants continued to endure cold and damp conditions.