8760 hours; train 7248, test 1344 (8 weeks)

model                   MAE kWh/h  error in 8-week bill
same hour last week         2.141          -149,137 Rp
linear regression           1.592           -47,021 Rp
gradient boosting           1.532           -84,926 Rp
actual 8-week use 7,396 kWh = Rp 10,687,685

linear model: each degree above 26 C while open adds 0.443 kWh per hour
weekend adds 0.745 kWh per hour on average
