Fairair - The right advice means the right choice

Size Calculator

What size do I need? (Single Room)

All residential air conditioners will carry a label showing the unit's cooling output in kilowatts (kW).

Every room and every home is different, so we recommend that you get a licensed contractor to visit your home and provide a detailed heat load calculation. Using the calculator below, however, will give you a rough idea of the cooling output you will need:

1. 1  

2. 2    


3. 3    

4. 4What is the height of the ceiling in the room you are cooling?


5. 5What is the total area of the internal walls with unconditioned space adjacent?

6. 6What is the total area of external walls including all the windows?  

7. 7How large are the windows? 

m² South  

m² South East  

m² South West  

m² East  

m² West  

m² North  

m² North East  

m² North West  

8. 8   

Total cooling requirement (kW) =

This calculator will estimate the capacity required to cool a single room. If you want an air conditioner to cool multiple rooms, the estimation process is more complex and you will need to seek advice from a licensed contractor.