This consists of a single fan coil under the floor or in the ceiling and an outside condensing unit. In most installations add-on refrigerated cooling will be incorporated with gas ducted heater to make up a dual cycle airconditioning system.

A common question frequently asked is can you put an add-on cooling unit with the heating unit already in my home? The answer in most cases is no! Firstly, the ductwork is not fire rated, not R.1 certified and not large enough to cope with the air volume required for cooling and secondly, in a lot of cases the heating unit itself does not have enough air volume for add-on cooling. It needs either a fan upgrade and in most cases it is better to replace the old system with a new more efficient unit which has variable speed, especially beneficial for zoning.

Add-on cooling it a good alternative due to the fact that you are still using gas ducted heating. However, it is imperative that the set up is done correctly to avoid poor performance, especially on the cooling side. In many cases 3 phase power may be required for mid to large size homes.