Thread: What size aircon

I want to buy a aircon for my lounge room. What size aircon do I need the room is 48 sqm and how much should I pay.
Thanks

You'll need the room height as well, aircon's do cubic metres..

also you need to know how well the room is insulated (walls,ceilling,windows what kind of floor), how many people in the room on average.

Ok the room is insulated well as it is a brick home with bedrooms on both sides and doesnt see and direct sun light but does have a double sliding door, also has shade front and back. normaly only 4 people in the room and a 130 cubic meters

15000 BTU/Hour minimum, preferably 16-17000

some one just told me

easy, sq metres x 1,000 for BTU. so thats 48,000 BTU and say about 1 bht per BTU ?

Originally Posted by Rigger

some one just told me

easy, sq metres x 1,000 for BTU. so thats 48,000 BTU and say about 1 bht per BTU ?

The real method is sq. inches x .732, then divide that number by the SomTam factor

prob about 18,000 BTU

Or you could use the numbers used by HomePro:-

BTU - - - - - - - Sq Meters
9,000 - - - - - - 9-15
12,000 - - - - - 16-20
18,000 - - - - - 21-30
24,000 - - - - - 31-35
30,000 - - - - - 40-50
36,000 - - - - - 50-55

30 or 36,000 BTU for your big lounge. At this size I would suggest using two smaller units for better cold distribution and if it's cool you only need to run one

Obviously, any simple table makes lots of assumptions.

Why not wire for two units but install a single 18,000 unit. If it's not got enough oomph install a second unit.

24,000 will do the trick in that room.

Originally Posted by lom

15000 BTU/Hour minimum, preferably 16-17000

At least one person has some sense around here.

Aircons, you guys have problems. It was freezing again last night.

Originally Posted by Fabian

It was freezing again last night.

No it wasn't. It was boiling, especially during the powercuts.

Originally Posted by More Volts Igor

Or you could use the numbers used by HomePro:- BTU - - - - - - - Sq Meters 9,000 - - - - - - 9-15 12,000 - - - - - 16-20 18,000 - - - - - 21-30 24,000 - - - - - 31-35 30,000 - - - - - 40-50 36,000 - - - - - 50-55

I went to home pro and they wanted 60 K for a 40 - 50 SQM job there price chart is double of what you just posted, so I went to Macro and they had nothing big enounh, so tried SR and ordered a 23,000 BTU LG with some neo plasma upgrade for 29K bht
Thanks for the help

Originally Posted by Marmite the Dog

Originally Posted by lom

15000 BTU/Hour minimum, preferably 16-17000

At least one person has some sense around here.

Thats too small for that room dude for sure, having seen the length of it in person a 15,000 would cool one end and not the other.

The one he ordered is perfect.

Originally Posted by Spin

Thats too small for that room dude for sure, having seen the length of it in person

So have I. 18,000 BTU would be perfect.

If you want to cool the office and b/room then you need a 24k as 18k will be too small

But then it will be too big for just the bedroom. It is divided by a sliding door and only sometimes will cool the office as well, then it will work a bit harder for that time then close the door to sleep and ok for the bedroom.

Best would be to do both rooms separately. Maybe in the future.

Originally Posted by Bung

But then it will be too big for just the bedroom. It is divided by a sliding door and only sometimes will cool the office as well, then it will work a bit harder for that time then close the door to sleep and ok for the bedroom.

Best would be to do both rooms separately. Maybe in the future.

How would it be too big, or does it not have a thermostat ?

Better to go large and have it working at an easy pace than one too small working it guts out.

Over sizing an airconditioner is a bad as under sizing one.

I my case here an 18000BTU unit will be ok for approx 20-30 sq m room. So at 24 sq m it will be fine.

Add in an office of 16 sq m and it will be too small. Size it for both at 24000BTU and it will be too big for the bedroom, short cycle and not remove the humidity.

I'll leave it at 18000.

What makes a significant difference too is the A/C fan action.

The best one I've found is a Toshiba with the side to side blower coupled with the direct ventilation. Gets the cool air throughout the room better than the conventional blower.

Originally Posted by Bung

Over sizing an airconditioner is a bad as under sizing one.

Have to disagree.

I have an 18k unit in my office where a 9k or 12k would probably do and it rocks.

Yeah but I bet it will be short cycling....a lot of other factors to consider like insulation, roof ventilation, south facing walls etc. The room may be sized for 12000BTU but needs an 18000BTU because it is so hot.

aprox 1 TBH per BTU and up