Does a gas fireplace use less gas than a furnace?

I just installed a gas fireplace in the lower section of the house. Just wondering, seeing hot air rises, would it more efficient to heat (generally)

I just installed a gas fireplace in the lower section of the house. Just wondering, seeing hot air rises, would it more efficient to heat (generally)with the fireplace or keep using the furnace.

or:I just installed a gas fireplace in the lower section of the house. Just wondering, seeing hot air rises, would it more efficient to heat (generally)with the fireplace or keep using the furnace.

or:A fireplace is not a furnace. The house has to be designed differently. Buy this book: www.amazon.com/Forgotten-Art-Building-Good-Fireplace/dp/0911469176/ref=sr_1_3

or:You can call locksmith to fix this.

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