There has been much publicity about New Zealand houses having indoor temperatures below World Health Organization standards and how insulation can benefit the health and comfort of the occupants. Landlords are required to install underfloor and ceiling insulation. In Christchurch, in some council flats, it has been suggested that commercial insulation is not practical and too expensive to retrofit, and tenants have been asked to use bubble wrap on windows. So, does bubble wrap actually improve interior comfort? In this study, air temperatures were measured in a typical New Zealand, three bedrooms, 100 m2, 1960s house. A heat-pump in the living room was set to heat to 18 °C. Bubble wrap was applied to bedroom windows during the winter and spring of 2019. Temperatures were compared to 2016 data, which was prior to the installation of the bubble wrap. Regression analysis was employed to determine if the bubble-wrap had any effect on air temperature by either reducing variability or improving average temperatures.
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