A retrofit control of a ductless mini-split system (DMSS) for use in relation to temperature monitoring within a property. Data indicating a command is transmitted to a controller associated with a ductless mini-split system. The command causes the controller to configure an operation to be performed by the ductless mini-split system. Power output associated with the ductless mini-split system is monitored based on transmitting the data indicating the command. A determination that the operation has been performed by the ductless mini-split system is made based on monitoring the power output. Data indicating that the operation has been performed by the ductless mini-split system is provided for output.