Gas Integrated Air Conditioning
How does Add-On Air Conditioning work?
Depending on the system and site, Add-On Air-Conditioning can be incorporated to a Gas Central/Ducted Heating system, The Add-On Airconditioning system is installed in the ductwork on the supply air side of the Gas Central/Ducted Heater System.
The Add-On Air-Conditioner unit does not require its own fan or thermostat, it relies on the thermostat of the Gas Central / Ducted Heater to operate the fan.
The Gas Central / Ducted Heater unit blows air across the coil cooling the air down, then cool air flows through the ducting system to the vents out into the room and re-circulated back into the system to be cooled again.
The Add-On Air-Conditioning System can be incorporated into the Gas Central/Ducted Heater system at a later date provided that the Gas Central Heating has been designed to be able to have Add-On Air-Conditioning attached.
To be able to Add-On Air-Conditioning to the Gas Central / Ducted Heater, the installation will require a larger fan capacity along with increased ducting and vents. For the best performance of the Add-On Air-Conditioning unit the fan capacity, ducting and vents will need to be allowed for in the original design of the Gas Central / Ducted Heating System.
Research commissioned by the Australian Gas Association found that gas is well ahead of other forms of heating in limiting greenhouse gas emissions... 
