Air Con replacement

[KannikaP]

I have an 11 year old 'conventional' Mitsu 12000BTU air con in my bedroom, which takes in air at the ambient room temperature, cools it down to 16 degrees and pumps it out until the ambient temperature is down to whatever I have set on my remote control, at which point the compressor should stop.

This past month this has not happened and so the unit has been on for 6 hours a night, 18.00 to midnight, consuming approx. 1 kW of electricity per hour.

After reading several posts here with members saying that an Inverter type had cut their lekky consumption by 50%, I am thinking about replacing it with say, a Mitsu 12500 BTU Happy Inverter @ Bht 18000.

So going through the figures, 6 hours per day x 30 days per month = 180 units, @ Bht 5 per unit = Bht 900. 50% saving = Bht 450. ( I know it MAY go back to Bht 4)

This would not be every month as some I do not put it on at all, but let's say 8 months per year = Bht 3600 saving per year.

The cost of the Inverter is Bht 18000 divided by the annual saving of Bht 3600 = 5 years before any savings seen.

Can anyone see a flaw in my O Level maths?

Edited April 24, 2023 by KannikaP

[sandyf]

I am in a similar boat. My LG is also 11 years old but it does cycle, and in the current climate cycling a bit quicker than normal. The real problem is that being old style the louvre is top hinged and now doesn't operate as smoothly as it did. I have to mess about to get it fully open and even when new never discharged horizontally.

I have been thinking about replacing it with a Daiken or Mitsu invertor so would be interested to see how yours works out.

[KannikaP]

8 minutes ago, sandyf said:

I am in a similar boat. My LG is also 11 years old but it does cycle, and in the current climate cycling a bit quicker than normal. The real problem is that being old style the louvre is top hinged and now doesn't operate as smoothly as it did. I have to mess about to get it fully open and even when new never discharged horizontally.

I have been thinking about replacing it with a Daiken or Mitsu invertor so would be interested to see how yours works out.

I did say that mine is NOT cycling as it is having difficulty cooling the hot room down to the temperature I set. It simply goes on & on trying it's little best, which is correct.

Try some WD40 on the louvre. Why do you want it to discharge horizontally? Would the cold air not go over your head?

Replacement with an Inverter will not happen if it will take 5 years to see any savings.

Edited April 24, 2023 by KannikaP

[brianthainess]

Have you tried cleaning your AC ? as My friend had a similar problem, he had it cleaned and all was fine again. 

[macster44]

 

Hi

What is the cost of non inverter unit...?

 

I think the cost difference between the 2 units is what 

you want to compare.  The benefit of the inverter is that the unit doesn't shut on and off like a typical AC unit. The fan/compressor adjusts speed up and down depending on the cooling demand and therefore uses less energy when its not needed and doesn't suffer from abrupt starts and stops of the compressor each cooling cycle.

If the inverter unit only costs about B3000/100 usd more  vs. the non inverter I would think its an easy choice to spend the small amount to realize savings on your electric bill.....just my .02 worth

mac

[KannikaP]

3 hours ago, macster44 said:

 

Hi

What is the cost of non inverter unit...?

 

I think the cost difference between the 2 units is what 

you want to compare.  The benefit of the inverter is that the unit doesn't shut on and off like a typical AC unit. The fan/compressor adjusts speed up and down depending on the cooling demand and therefore uses less energy when its not needed and doesn't suffer from abrupt starts and stops of the compressor each cooling cycle.

If the inverter unit only costs about B3000/100 usd more  vs. the non inverter I would think its an easy choice to spend the small amount to realize savings on your electric bill.....just my .02 worth

mac

You obviously didn't read my OP. Why spend Bht 18000 on an Inverter if it is only going to save Bht 3600 per year in electricity?

[KannikaP]

3 hours ago, brianthainess said:

Have you tried cleaning your AC ? as My friend had a similar problem, he had it cleaned and all was fine again. 

Yes cleaned regularly and properly. My question is about the cost of a new Inverter vs the electricity cost saved.