Is this unit compatible with an existing air handler furnace unit

No, the Daikin SkyAir RZQ48TBVJUA outdoor heat pump unit is not directly compatible with a standard existing third-party furnace or generic cased coil. It requires proprietary communicate-linked Daikin SkyAir indoor units (such as the FTQ multi-position air handler or FBQ ducted units) or specific Daikin interface adapter kits for operation

If you have any further questions, please call us and we will be happy to assist you.