For a precise assessment, a technician will need to do an on-site check. However, the following table does provide a guideline:
| Room Size | Air Conditioner Size |
| 15 to 18 m² | 9 000 BTU |
| 20 to 25 m² | 12 000 BTU |
| 30 to 35 m² | 18 000 BTU |
| 40 to 45 m² | 24 000 BTU |
| 55 to 60 m² | 30 000 BTU |
| Larger Areas | The technician to advise |
* Multiply the length of your room by the width to get the total meters squared.
R22 has been the refrigerant of choice for residential heat pump and air-conditioning systems for more than four decades.
The release of R22, such as those from leaks, contribute to ozone depletion. In addition, R22 is a greenhouse gas and the manufacturing of R22 results in a by-product (HFC-23) that contributes significantly to global warming.
As the manufacturing of R22 is phased out over the coming years as part of the agreement to end production of HCFCs, manufacturers of residential air conditioning systems are offering equipment that uses ozone-friendly refrigerants, one of these substitutes is R410A.
As a result if your system ever leaks, the escaping refrigerant won’t contribute to ozone depletion.
A non-inverter (standard) is a basic model which operates at a fixed speed, simply controlling temperature by switching on/off alternately. This is the most commonly sold unit and are significantly cheaper to buy but consume up to 40% more electricity.
Alternatively, a more sophisticated ‘inverter’ has a variable-speed compressor which constantly regulates to the desired temperature – a more economic method of operation and A-graded for energy-efficiency. Although costing more to buy, inverters offer a wise long-term investment.