“…According the 2015 Residential Energy Consumption Survey of the US Energy Information Administration, 4 the bulk of home electricity use is for air conditioning, refrigerators, and space and water heating, with only about 10% due to lighting. Making deep cuts in household electricity use thus involves either high-effort behavior change such as turning down the heat in winter, or 2 The rapidly growing literature, starting from Schultz et al (2007), now includes a large number of studies evaluating specific designs (Allcott, 2011;Ayres et al, 2012;Costa and Kahn, 2013;Ferraro and Price, 2013;Dolan and Metcalfe, 2015; Jaime Torres and Carlsson, 2018;Holladay et al, 2019;Brülisauer et al, 2020), as well as long-run effects (Ferraro et al, 2011;Allcott and Rogers, 2014;Bernedo et al, 2014), welfare implications (Allcott and Kessler, 2019), and psychological mechanisms (Alberts et al, 2016;Byrne et al, 2018).…”