Question
Consider two choices for the furnace to heat a building: an ordinary gas furnace with efficiency75% (seasonal average), costing $1000, and a condensing furnace with efficiency 95% (seasonal average), costing $1800. Suppose the annual heating load is 100 MBtu (105.5 GJ) and the fuel price $7.00 per MBtu ($6.64 per GJ).
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