Quote:
Originally Posted by DQDick
Welcome to the forum! Without a picture this is just a guess, but units that were made to have a second AC usually have a sensor on the bedroom ceiling that tells the thermostat what to do. If there is a vent in the bedroom it may also have the wiring up in there for the AC unit, so you just take the vent out and put the AC in.
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The sensor looks like a strange kind of bump thing that you may mistake for a miniature smoke detector. Also, there's no 'plug' for a second AC. You have to get both an AC unit and a grill. Depending on the brand, one or the other will have a junction box that you can connect the wiring that will be somewhere near the vent when you remove it, IF your unit was wired for two ACs.
There's also several other things to do to increase the efficiency of your existing (new?) AC. The round ceiling vents stick up into the ducts too far and can be cut down to increase airflow. You can also get a very inexpensive roll of mylar bubble insulation from a big box hardware store and cut pieces to fit your windows. Put them between the shades and glass whenever the sun starts giving you heat gain. And be certain to use the exhaust fan whenever your using the range!