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Skylights allow light into the house without allowing in too much heat.

Skylights allow light into the house without allowing too much heat in.

Hi,

Which of the above two versions sounds better to you? Thanks.
Comments 
Both are fine; I suppose I prefer the first as a bit more more formal.
Mister MicawberBoth are fine; I suppose I prefer the first as a bit more more formal.

Thanks, Mister.