Add-on cooling keeps your gas ducted heater and gives it a second job. A refrigerated cooling coil is fitted in the roof space, in line with the heater, so the heater’s own fan pushes air across it. A condenser goes outside on a slab or a wall bracket, and insulated refrigerant pipework links the two. The coil sheds water as it cools the air, so a condensate drain is run to a proper outlet and never left to drip onto the ceiling. The heating-only controller is swapped for one that runs both, and a licensed electrician wires the dedicated circuit the condenser needs.
Not every heater takes an add-on. The coil has to physically fit, the heater’s fan has to move enough air for cooling, and the two have to be able to talk to each other. Heaters sold as dual heating and cooling systems are built for it; many older units, and units already short on airflow to the far rooms, are not. That is why the job starts with a look at the heater model, the fan and the roof space rather than a price off a chart.
The whole thing is installed by licensed electricians and ARC-licensed technicians, with the refrigerant lines pressure-tested and vacuumed before a valve is opened. You get photos of the coil, the condenser and the drain when it is done.