Authors' preferred specification is Table 5 column 4 (household FE + hour-by-day FE), both ITT and ToT panels || 'In column 4, our preferred specification, we include both household fixed effects and hour-by-calendar-date dummies' (p.1429). Price-only preferred effects are -0.038 (ITT) and -0.040 (ToT).
Jessoe, K., & Rapson, D. (2014): "Knowledge is (Less) Power: Experimental Evidence from Residential Energy Use." American Economic Review, 104(4), 1417–1438.