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The frequency and intensity of extreme heat events are expected to increase with climate change. Understanding the ways in which heat influences health outcomes is critical to mitigating its effect both now and in the future through targeted interventions and adaptations. However, few studies have been able to analyze the role of indoor conditions in influencing health therefore missing a critical component of the environment. In addition, previous studies have not focused on heat-specific health outcomes. This study will fill this information gap through a case-control study design and regression analyses. Working with the New York City Fire Department Emergency Medical Services we compiled the Patient Care Reports and indoor temperatures for patients receiving emergency care during the summer of 2016. In order to collect indoor data, paramedics carried portable sensors into buildings while responding to 911 calls which passively measured indoor conditions. We compared 55 heat-specific health outcomes and 1611 controls through a case-control study and propensity score matching. Indoor temperatures over 28℃ resulted in a significant increase (OR=3.88 CI[1.83, 8.25]) in chance of heat-related 911 calls. Current heat warnings are for outdoor temperatures are issued at two or more days between 35-37℃ or any length of time above ~38℃. However, our results indicate the threshold at which people become sick due to indoor exposure is actually lower. Therefore these results could inform policy regarding indoor temperature safety standards.