Classroom Temperatures and Asthma-Related School-Based Health Care Utilization: An Exploratory Study

Objective: Schools with aging infrastructure may expose students to extreme temperatures. Extreme outdoor temperatures have previously been linked to more asthma-related health care utilization. Explore the relationship between classroom temperatures and school-based health care visits for asthma in an urban school building with an outdated heating and cooling system. Methods: Participants were students in grades K-8 who received health care from a school-based health center (SBHC) (n = 647) or school nurse (n = 1244) in 2 co-located urban public schools between 2016 and 2018. The probability of an asthma visit to the SBHC or school nurse was modeled as a function of indoor temperature exposure using generalized estimating equations with covariates accounting for grade, sex, outdoor temperature, days at risk of asthma visit, nonasthma visits, month, and year fixed effects. Results: Classroom temperatures ranged from 48.0˚F to 100.6°F. Higher mean grade-level indoor temperatures from a baseline of approximately 70˚F to 76˚F were associated with increased rates of asthma-related visits to the SBHC or school nurse on same day of exposure. Model-generated estimates suggest that an increase of 10˚F in indoor temperature relative to a baseline of 75˚F was associated with a 53% increase in the rate of asthma-related SBHC visits. Conclusions: Elevated classroom temperatures may be associated with more school-based health care utilization for asthma. Low-income and students from racial and ethnic minority groups have disproportionately higher rates of asthma and are also more likely to attend schools with poor infrastructure. The potential benefits of school infrastructure investments for student health, health care costs, and health equity merit further investigation.