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I have a regular size Duo-Therm Brisk Air, which was installed at Keystone when they built it. I have used it mainly with the fan option or the heat option. I did use it a few time with A/C option and it surely cools down the bedroom. As you know heat rises so if it's HOT outside your bedroom will be very hot and stuff, but with that 2nd A/C you can really tell a difference. I don't even think it should be an option in any of these units if you're using your unit in the summer it can alway be useful to have it. I've used mine alone without the main A/C on and it does work very well in the bedroom especially when you're trying to sleep on a hot stick humid night. Also, to operate the 2nd A/C it is all manual (turn knobs), Fan, Heat Strip, and A/C Options at "high, medium and low". Good Luck to ya!
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