Surprising Gree is not famous in Malaysia, their price are still quite expansive here.

I read the main dealership is in Sarawak, Gree's aircon is very highly rated in china, recommended by most of my china colleagues, but their price is steep.

Yeah is cheaper than Japanese brand, but more expansive than Midea. haha

Need to find a show room for Gree in PJ area. i think kota damansara have one. will check that out soon

it depends on BTU in and BUT out of that room too.

but a normal room with 4 walls you can use this as reference

BTU CHART BASED ON ROOM SIZE
Room Size BTU’s Needed Room Size BTU’s Needed
150 sq. ft. 5,000 BTU’s 700 sq. ft. 14,000 BTU’s
250 sq. ft. 6,000 BTU’s 1,000 sq. ft. 18,000 BTU’s
300 sq. ft. 7,000 BTU’s 1,200 sq. ft. 21,000 BTU’s
350 sq. ft. 8,000 BTU’s 1,400 sq. ft. 23,000 BTU’s
400 sq. ft. 9,000 BTU’s 1,600 sq. ft. 25,000 BTU’s
450 sq. ft. 10,000 BTU’s 1,900 sq. ft. 28,000 BTU’s
550 sq. ft. 12,000 BTU’s 2,700 sq. ft. 36,000 BTU’s

each wall have it own heat exchange rate, windows & and walls facing sunlight have huge impact on those numbers. I had been using carrier HVAC software Like HAP or Trace 700 to calculate the overall load of room to determine required head load(BTU).

if you need proper design refer to this
https://www.acca.org/HigherLogic/System/Dow...0e-718cc83286df

Quoted from: https://www.servicetitan.com/tools/hvac-load-calculator
"How To Calculate HVAC Load
The Manual J residential calculation is actually the proper method for sizing an HVAC unit—a technique designed by the Air Conditioning Contractors of America (ACCA). This calculation is commonly performed with complex computer programs, which require time, energy, and money. That’s why contractors have developed the BTU calculator as a rule of thumb. That way, technicians can determine a general estimate while in the field.

An accurately sized HVAC unit will ensure that the desired space can reach the right temperature without wasting energy. This is how you find that perfect number.


Step One:
Determine the square footage of the home. You can either find this in the home's blueprint or measure out the space room-by-room. Start by taking the length and width of each room and multiplying those measurements to calculate the square footage of that room. Add up the square footage of each room—and there you have it!

Another way to do this is by taking exterior measurements of the entire house and subtracting the square footage of any part of the home not intended to be cooled or heated—like a basement or garage.

Make sure to account for the height of the room, as well. Rooms with tall ceilings tend to demand more BTUs than one with a standard height.


Step Two
Account for factors that affect insulation. Check to see what grade of insulation the home was built with. If you are unsure, U.S. Standard Insulation is probably your best bet. Other key factors that need to be taken into consideration are sun exposure, windows, and airtightness for the entire home.

Common factors to be accounted for include:

Each person living in a home = 100 additional BTUs
Each window in a home = 1,000 additional BTUs
Each exterior door in a home = 1,000 additional BTUs


Step Three:
Think about how the living space is being used. Does this home or particular room have heat-producing appliances? How many people regularly occupy the space you are calculating? This should also inform the HVAC load that will be sufficient to heat or cool the intended area.


Cooling Load Calculation Example
To calculate the estimated HVAC load for a house with 2,500 square feet, 12 windows, and 3 exterior doors occupied by 4 people, simply plug it into this formula:

2,500 x 25 = 62,500 base BTU
4 people x 400 = 1,600
12 windows x 1,000 = 12,000
3 exterior doors x 1,000 = 3,000
62,500 + 1,600 + 12,000 + 3,000 = 79,100 BTU
"

DONT USE THIS! you will end up oversizing.
https://www.daikin.com.my/heat-calculator/

well recently my colleague who was renovating our new office using this compare with his own calculation, Daikin estimation is way higher than expected. I don't know what is the calculator assumption for the calculation.

Yes you should reduce the given BTU/hr compare that calculation with the one I shared and see which makes more sense.

normally most manufacture will share their db, it should be a value around 50-60, if they dont call in to their sale/service center to ask. if it is out of spec after installation you can claim warranty.