[SamJack]

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Little off topic but here goes. This is how I would do it.

private AirConditioner officeAC;

.
.
.

officeAC = new AirConditioner();
officeAC.turnOn();
officeAC.setTemp(69);

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.

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One slight difference in how I read the question
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There is a reference variable officeAC of type AirConditioner . Create a new object of type AirConditioner using the officeAC reference variable.

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//Assumed officeAC has already been defined and initialized

//Not sure this is valid Java syntax, but they do ask for a "new" object
AirConditioner myAC = new AirConditioner(officeAC);
//If this isn't valid, use AirConditioner myAC = officeAC;

//The rest is the same
officeAC.turnOn();
officeAC.setTemp(69);

Edit: P.S. I hate Java. Learn C++ or C#

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If we are entertaining toughts that AirConditioner class has contructors other than the default one.

officeAC = new AirConditioner(true); // constructor determines if the airconditioner is on or off at creation time.
officeAC.setTemp(69);

OR

officeAC = new AirConditioner(69); // creates the air conditioner with the temperature already set @ 69