What happens if your brew gets too cold during fermentation?

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ea1154

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I have a deep freezer that I'm using as a fermentation chamber. I want to start kegging my beer but I dont want to buy another freezer and temp controller for a keezer. If I had a couple ales fermenting, would it hurt them if I dropped the temperature to keezer temperatures for the night then switch it back to fermentation temps?
 
Is that bad? I know it would take longer but would it noticeably effect taste/quality? Over a 24 hour period
 
if your past the rigorous portion of the fermentation process then ramping up the temp would be fine (bring it in the house).
 
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