[quote=“xaheer, post:63, topic:1275”]
any recommendations for gree which is being manufactured by dwp group in Pakistan(the assembler of Samsung ac)? moreover, i want to install a 12000 btu (1 ton) split in 13x20 ft room having one wall directly exposed to sunlight after 12 o’ clock. will it do the job or i should install a 1.5 ton ac.
It depends on your usage pattern:
You might be better off with 1 ton AC:
- If you run your AC mostly during night and keep it on while sleeping
- If you keep running your AC for long durations at a time (i.e. 5+ hours)
- If you can live with the fact that smaller AC might take an hour to cool down you room.
You should consider 1.5 ton AC:
- If you tend to run your AC at daytime most of the time.
- If a significant portion of your room comes under direct sunlight during the time of the day when you run your AC, or if your room is on top floor with roof exposed to sunlight all day long.
- If you have large windows, esp. towards sun-facing side.
- If you like to run your AC for short durations at a time (i.e. 1-3 hours)
- If you want your room to cool quickly, probably because you run AC for shorter durations (such as in TV lounge)
- If you can expect presence of a large number of people at a time while running AC in the room(such as in TV lounge or drawing room)
- If your room does not have optimum sealing (e.g. partitioned by curtains, big gaps from where air can escape)
- If you want your room to be extra-chilled.
You should not listen to what shop-keepers have to say, they would persuade you to purchase the largest available tonnage. They claim that high tonnage AC is alway better, but in fact it’s the other way round:
- A large capacity AC will indeed cool down the room quickly, however once the room has achieved the desired temperature, it will start ‘short cycling’, i.e. compressor will run for unnecessarily shorter durations and will cycle (i.e. shut on/off) a large number of times in a given time frame. The ‘short-cycling’ will have a significant impact on the efficiency of your AC (i.e. it will consume unnecessary extra power than would have been required by a lower capacity AC to achieve the same results), whereas since the compressor will run for overall shorter durations in a given time period and with lesser efficiency too, it will remove less moisture from the room. Remember that AC’s job is not only to bring the room down to the desired temperature but also to maintain the humidity at an optimum level. The humidity factor is completely overlooked here in our market, even though it has a considerable impact on making the air-conditioned environment more comfortable to humans.
Having said that, I would like to tell you that I have recently installed a 1 ton AC in my room which is 190 sq. feet. My usage pattern lies in the first category that I’ve outlined above, i.e. I run it mostly during night and for long durations (6 - 10 hours). Even though the AC takes a bit of time initially to cool down the room, I strongly believe that I would have been better off with 0.75 ton AC in my 190 sq. feet room (unfortunately, its hard to find 0.75 tons AC these days in Pakistan). I continuously monitor the humidity level of my room with a hygrometer and it turns out that once the room has cooled down, the humidity starts to rise again to sub-optimum levels indicating that compressor remains shut off for most of the time during nighttime. However, occasionally when I run the AC during daytime (though my room is shaded), when outside temperatures are higher, humidity levels do not rise much indicating that compressor remains on most of the time.
On the other hand my TV lounge falls in the 2nd category and I tend to run the AC for around 2 hours and would like the room to cool quickly, therefore there I have a 2 ton AC for 300+ sq. feet area.