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My late Dad's old finished porch (office) room AC --probably from early 1970s--no longer works. It's a Carrier 51-SC1001, rated at 8700 btus. Turn it on, motor goes but no air flow. Anyway the extension has two rooms separated by a partition and door, one room twice the size of the other. the main room is the main concern for cooling. both rooms have dropped ceilings 84" H over which is a sloping, fiberglass insulated extension roof that sees alot of sun.
Main room is 200sq ft, 1400 cu.ft, 130sqft net outside wall, 50sq ft windows, 20 sqft door; Room 2: 100 sq ft, 700 cu ft, 130 sq ft net outer wall; 20 sq ft windows. All on slab. <span style="color:#000000">Longest wall is northern exposure.
Does the 8700btu rating sound good? My Dad was an HVAC engineer but I'm wondering are today's ratings comparable with 40 years ago, or does improved efficiency require a re-calculation? I know from other posts that you want the unit to be small enough to remove enough humidity.