Determine the heating base-load, the balance temperature, and the BLC of a house located in Boulder, Colorado, based on the monthly utility bills provided in the following table. For the analysis assume that the house is heated 24 hours/day and that the seasonal efficiency of the gas furnace is about 78 percent. It should be noted that the house is generally unoccupied during the period May 25–July 24 (for both 2004 and 2003). Provide any pertinent comments on the thermal performance of this house.

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Date of Bill Dec. 20, 2004 Nov. 21, 2004 Oct. 17, 2004 Sep. 19, 2004 Aug. 20, 2004 Jul. 24, 2004 Billed Days 34 30 29 31 28 35 Therms Used 230 71 50 21 18. 6 Outdoor Temperature (F) 33 51 63 72 77 79