how many BTU's

[roger101]

I live on the top floor in a condo measuring approx 33Sq M. There is no insulation. I am thinking or replacing my present Air Con.

How many BTU's should I be looking at.

[lopburi3]

Have you check the BTU of your current unit?  Expect that should be a good first step - and perhaps find out what others with same size units are using and if they consider them good enough - there is just too much difference in personal requirements to be very specific (although the major players will have suggested size units for sq meters).  I would go inverter model based on the one unit we have - very fast cooling and temp stays where you want it - and should not be a bit issue if too large.

[wayned]

19000 -23000 BTU

[besth]

I was going to suggest 20.000 if directly under the roof without insulation, so quite

close to wayned.

 

It also depends on what temperature you would like to achieve in the room.

[Crossy]

The Thai 'standard'  600 BTU/m² comes out at 20,000 BTU, a good starting point.

[trogers]

Is the floor layout one big open studio with a bathroom and a balcony?

[roger101]

Is the floor layout one big open studio with a bathroom and a balcony?

 

Yes, but the balcony is sealed in with a window and part of the 33sq m

[Pib]

What size is your current A/C?  Is it blowing cold air at around 10-13C "right at the output vent"...if not, you might want to get the A/C serviced to get it operating properly...then maybe it will be enough to cool your condo.  

[KittenKong]

My open-plan condo is twice that size and my new 24kbtu inverter aircon has no trouble cooling it down even on the lowest fan setting, but I'm not on the top floor.

[trogers]

My open-plan condo is twice that size and my new 24kbtu inverter aircon has no trouble cooling it down even on the lowest fan setting, but I'm not on the top floor.

Being on the top floor need not mean additional thermal load, if the concrete roof above has insulation against the hot sun.

Is your ceiling surface hotter than the walls?

[KittenKong]

 

My open-plan condo is twice that size and my new 24kbtu inverter aircon has no trouble cooling it down even on the lowest fan setting, but I'm not on the top floor.

Being on the top floor need not mean additional thermal load, if the concrete roof above has insulation against the hot sun.

Is your ceiling surface hotter than the walls?

 

As mentioned, I'm not on the top floor. I pointed this out in my comment in order to make the comparison more valid for the OP; he may need more cooling power to compensate.

 

My new aircon is many times more efficient than the old one it replaced (my bill has dropped by two thirds or more), but I'm not sure how much of that is down just to it being new or just to it being an inverter model. Either way, I would definitely recommend having a new inverter model aircon fitted to replace an old model if it is to get much use. It should pay for itself in just a year or two.