The cooling load of a residence at summer design conditions is 46 800 Btu/hr. From the performance specifications for high-efficiency residential central air conditioners provided in Table 6.8, select an air conditioner that can efficiently meet this load in tons-cooling.

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Tons-Cooling 2.0 2.5 3.0 3.5 4.0 TABLE 6.8 PERFORMANCE SPECIFICATIONS FOR HIGH-EFFICIENCY RESIDENTIAL CENTRAL AIR CONDITIONERS. COMPILED FROM MANUFACTURERS' INFORMATION. 5.0 Capacity Btu/hr 24 000 30 000 36 000 42 000 48 000 60 000 Minimum 14.60 15.00 13.00 13.50 13.50 13.00 13.50 13.50 15.85 15.50 15.20 15.00 14.50 13.60 15.00 14.00 13.25 15.15 15.10 14.00 11.20 14.00 14.35 14.85 13.50 13.00 SEER Range Maximum 16.50 16.20 15.60 16.00 16.00 16.00 15.75 15.75 18.00 18.00 17.20 17.10 16.50 16.50 16.00 16.00 15.50 16.50 16.40 16.00 15.60 15.50 16.40 15.80 15.50 15.25 Minimum 12.85 13.00 11.40 12.00 12.70 11.40 11.70 11.70 11.35 11.45 11.00 10.05 10.65 11.95 13.35 12.10 11.30 10.75 10.15 12.20 9.90 10.15 9.95 9.80 12.00 11.60 EER Range Maximum 14.55 14.25 13.50 14.44 13.55 13.95 14.00 14.00 13.20 13.15 11.00 12.00 12.85 11.95 14.40 14.00 13.20 12.30 11.60 14.50 13.00 11.85 10.90 10.35 14.00 13.70