Table 3.

Regression results (shade conditions). Dependent variable = kWh/day.

Explanatory Variables	Model 1	Model 2	Model 3
Intercept	−1.543	−3.504	−10.750
	(9.556)	(9.575)	(9.592)
Family size	3.594^{^z}	3.427^{^z}	3.620^{^z}
	(0.463)	(0.467)	(0.477)
Living area	0.013^{^z}	0.013^{^z}	0.013^{^z}
	(0.001)	(0.001)	(0.001)
House age	0.057	0.101y	0.092^{^y}
	(0.042)	(0.045)	(0.047)
# floors	1.416	1.793^{^x}	1.828^{^x}
	(1.042)	(1.051)	(1.072)
Elec. Cooking	−0.912	−0.761	−0.609
	(1.271)	(1.270)	(1.291)
Elec. H₂O heat	4.443^{^z}	4.456^{^z}	4.177^{^z}
	(0.969)	(0.967)	(0.981)
Window AC	4.530^{^x}	4.428^{^x}	4.648^{^x}
	(2.642)	(2.638)	(2.670)
Laundry loads/wk	1.009^{^z}	1.009^{^z}	1.103^{^z}
	(0.168)	(0.167)	(0.168)
Second Freezer	2.519^{^z}	2.602^{^z}	2.573^{^z}
	(0.947)	(0.946)	(0.957)
Swimming pool	22.223^{^z}	21.539^{^z}	20.470^{^z}
	(1.719)	(1.739)	(1.765)
Average humidity	0.013	0.037	0.127
	(0.125)	(0.126)	(0.126)
Daytime temp. diff. (mean)	2.155^{^z}	2.192^{^z}	2.218^{^z}
	(0.083)	(0.084)	(0.085)
Percent shade		−0.088^{^y}
		(0.036)
Light shade	−0.254	0.43
	(1.431)	(1.457)
Moderate shade	−0.507	1.197
	(1.289	(1.469)
Heavy shade	−9.174^{^z}	−6.884^{^z}
	(1.356)	(1.655)
Late a.m. shade percent			0.020
			(0.028)
Early p.m. shade percent			−0.005
			(0.047)
Late p.m. shade percent			−0.117^{^z}
			(0.022)
Adj. r²:	0.6030	0.6043	0.5957
F-statistic:	153.8	145.0	149.2
N:	1510	1510	1510