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Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > Lager Temperature Swings.
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Old 02-11-2013, 02:37 PM   #1
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Default Lager Temperature Swings.

So, my fridge is dead. Basement only gets to 58. And primary fermentation is complete.

I had the crazy idea to put the carboy on my deck, but the highs are 65 and the lows are 35.

Anyone know if large temperature swings will have a negative effect on the processs?

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Old 02-11-2013, 03:04 PM   #2
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A water bath would help stabilize the swings a bit.

Have you considered the "Swamp Cooler" type jacket device in the basement with some frozen 2L bottles?

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Old 02-11-2013, 03:07 PM   #3
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If you are at the point where you are starting the lagering, I would leave it in the basement at 58° until you can get a new fridge.

While 58° is too high for lagering, you will have less negative effects (if any at all) leaving it at 58° than letting the temp swing back and forth.

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Old 02-11-2013, 03:21 PM   #4
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Here is a plot of what you are asking about:
http://woodlandbrew.blogspot.com/201...g-outside.html

Generally, a five gallon batch of beer in a water bath of 5 gallons will have half the temperature swing of the air temperature.

I put your weather into a spread sheet I use for this sort of thing. Chart is attached.

Looks like you'll have to move it back inside around the 16th.

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Old 02-12-2013, 04:19 AM   #5
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Quote:
Originally Posted by WoodlandBrew
Here is a plot of what you are asking about:
http://woodlandbrew.blogspot.com/201...g-outside.html

Generally, a five gallon batch of beer in a water bath of 5 gallons will have half the temperature swing of the air temperature.

I put your weather into a spread sheet I use for this sort of thing. Chart is attached.

Looks like you'll have to move it back inside around the 16th.
This is phenomenal! Thanks for the help!
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There are actually techniques that some use that are an open fermentation where they basically ferment in a bucket covered in aluminu, alumini, aluemin... tin foil.
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