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Open up ceiling to access indoor unit!
Remove old ducted aircon indoor and outdoor unit
Use existing pipes from apartment to roof, need to be flushed, cleaned etc
Install new 7KW ducted system, ideally with wifi integration.
Install new return air vent and access panel
The important part is that the existing pipes going up to the roof need to be used! The current system is >10 years old and apparently runs on some old gas, so the pipes would need to be flushed and cleaned to use a new model aircon which uses current gas.
Specific Job Details:
Schedule: Not Specified
Budget: More than $5000