Room Size: 16 ft x 12 ft = 192 sq. ft
Ceiling Height: 11 ft
Windows: one window 6 ft x 8 ft on southern wall. Curtains: Yes
Room Location: Ground Floor
Occupants: 2
Walls Insulation Status: Unknown
House Constructed: 1990s
No wall is exposed to direct sunlight.
The calculator at energystar.gov says room size of 150 upto 250 sq. ft. needs 6,000 BTUs/hr.
This article at dawn.com says: "Typical houses, offices and other buildings in Pakistan are not insulated. For these buildings, a general rule of thumb is that 20 BTU of cooling is required per ft2, assuming the room ceiling height is 8 ft. For well-insulated buildings, only 12 BTU/ft2 is needed."
I've read other threads on pakwheels forums. Many people have wrote that you need 1.5 Ton AC if the room size is around 200 sq. ft.
Why this difference?
If the energystar.gov is indeed correct, then I think these are the reasons people suggest oversized air conditioner:
1) Low Voltage. Conventional ACs wouldn't cool down the room at low mains voltage.
2) Incorrect Installation. Here I would like to thank @Xulfiqar for telling everyone about the necessary use of vacuum pump during installation.
Should I buy 1.5 Ton Inverter AC for the room that I've described above?
