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Table 1: Comparison of energy and staff costs for North American offices
Costs	Rosenfeld	Abdou and Lorsch	EPA	Woods	BOMA
Staff costs ($/ft²/y)	300	218	200	237	130
HVAC running costs ($/ft²/y)	鈥�	2-10	6	12	2.9
Energy costs ($/ft²/y)	1.50	1.00-2.00	2.00	2.00	1.50
Ratio of staff costs to energy costs	200	1214-218	100	118	87
Productivity offset of energy (%)	0路5	0路5-0路9	1路0	0路9	1路2
Prodcutivity offset (min/day per person)	2路25	2-3路75	4?	鈥� 5	听

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