Fig. 12

(a) Synthetic HVAC use and house area (i.e. floor area). Boxplot comparing daily HVAC consumption in a winter day for the selected target locations by house area (i.e. floor area). The x-axis groups floor area of houses in five bins denoted in two units sq. ft (ft²) and sq m (m²). The bins are as follows: ≤1000 ft², 1000 - 1500 ft², 1500 - 2000 ft², 2000 - 3000 ft², ≥3000 ft². It is observed that as floor area of the house increases HVAC consumption increases in all regions. Winter temperatures are relatively moderate in AZ and TX, thus, the HVAC consumption is less as compared to other regions. (b) Synthetic lighting use and household size. Lighting consumption increases as household size increases. Household size indicates number of members in a household.