Best indoor plants to generate oxygen?

I am getting a new condo and think if one thing would make it feel more energetic it would be having fresh air indoors. However I have been looking at electric oxygen separator machines and, beside being expensive ($1000+) they all seem to note it takes a couple of full sized trees just to make enough oxygen... show more I am getting a new condo and think if one thing would make it feel more energetic it would be having fresh air indoors.

However I have been looking at electric oxygen separator machines and, beside being expensive ($1000+) they all seem to note it takes a couple of full sized trees just to make enough oxygen to fill up a small room. Are there any special plants known for producing a lot of oxygen even from small, low-light confines?
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