there isnt much price difference between 1.2 to 1.5t. If your budget can accommodate 1.5t, get it. The faster your room cool, the less time ac needs to run at full power. inverter acs power down once required cooling is achieved
Im running inverter ac without stabilizer since 3 years. Unless your area has extreme power issues, dont get it. even if you get it , it'll be 2~5k for strabilizer and 1.5k for electrician
It is true that inverters switch to low power mode once they attain the target temp, but this is not like a smooth analog step down. What I mean is there are certain predefined power limits (like a CPU) where it can operate, (e.g. 100%, 80%, 60%, 40% of rate capacity and so on). The number of such steps vary between brands and models. Models with more number of steps are typically more expensive. The problem is, if the cooling area is too big or has too many heat sources, the inverter never switches to low power mode. Conversely, if the area is too small for the cooling unit, the system will definitely reach the target temp faster, but may cool too fast even at the lowest step, when it will simply shut off the compressor till the temperature rises above a preset threshold and behave exactly like a non-inverter unit.
Actually the cooling area is only 120(10x12)(LxW) sq feet. There is additional 6 feet which increases my length from 10 to 16. This additional area consists of bathroom which I don't think requires cooling. So the actual area comes out to be 138 sq feet.(10x12)+(6x3)(LxW)
Please consider some other factors too, e.g. number of people in the room on an average, computers/laptops/projectors, doors and windows, top floor or not, whether walls are exposed to sunlight, etc. Below are two situations I face on a daily basis.
Example #1: I have a 1.5 tr unit in the bedroom of my ancestral home which is a 60+ year old building with 15" thick brick walls. Room size is 15' x 12.5' x 11.5', with 3 doors and 4 windows, south east open. I also have a somewhat powerful PC there. The unit cools the room very fast and sometimes I can hear the compressor shut off unless I set the target temp below 25 C.
Example #2: In my apartment bedroom (relatively recent construction, 11.5' x 10' x 9' size, 8" thick walls, east and north open, 2 windows, 2 doors, top floor with no false ceiling, only 1 TV), my 1.2 tr unit initially struggles to cool down the room in a hot summer day, but once it reaches a target of 27 C, steps down and maintains that temp quite well without the compressor shutting down even once.
TLDR: You can go with a 1.2 tr unit provided your room is not on the top floor and does not have too many windows or direct sunlight. Else, go with a 1.5 tr. The LG AC I have allows me to set the power limit manually too which helps when you want your 1.5 tr unit to perform as a lower capacity unit.
