Heating in an apartment

I am temporarily living in an apartment in Colorado Springs, over a garage we’re using for storage while our house is being completed. The apartment is freezing. Heat all the way up and ceiling fans running slowly in clockwise postion. The main living area has a very high vaulted ceiling, which I suspect we are losing heat to. I ordered a dyson heayer, but wondered if anyone could come up with some ideas. The windows and doors shut tight

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