Mmm ... didn't know that there are branded, albeit 'Oceanfree', DC fans on sale. I know 3 ways to lower the temperature - (1) Fans, (2) Chiller and (3) Install air-conditioning your whole room.
Whether you can make do with 28-29C depends on the plants you are keeping. Let us know their names and some of us (who have tried them before) may be able to tell you more.
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