Yeasts and Temperature

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JetFoley
Posts: 19
Joined: Wednesday Dec 30, 2009 8:14 pm
Location: Brisbane

Yeasts and Temperature

Post by JetFoley »

I've been wondering, how much does the temperature effect different yeasts?

I cant really control the heat here and I'll see the brew often get to 30C. Is there any yeast that I should stay away from? or any that will still work fine in this temp?
bullfrog
Posts: 922
Joined: Tuesday Nov 17, 2009 5:26 pm
Location: The Hawkesbury, NSW

Re: Yeasts and Temperature

Post by bullfrog »

I'd be avoiding subjecting any yeast to those temperatures!

If you don't have a fermenting fridge then there are still other ways to control your brewing temperatures. Try getting a plastic tub (or bath, laundry sink, etc), plonking your fermenter into it, filling with water and then dropping a few frozen water bottles into it (or just a single 2L PET) then just change the ice either once in the morning and once in the evening, or just once a day, depending what temps you are getting.

Apparently most yeast will tend to die around 30 degrees, but even if they survive you can be sure that they won't have produced a world-class beverage! I always aim to keep my ales at 18 and you want to go much lower than that for lagers.
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drsmurto
Posts: 3300
Joined: Friday Nov 17, 2006 11:53 am
Location: Adelaide Hills

Re: Yeasts and Temperature

Post by drsmurto »

30C equals nasty fusels/phenolics and esters in your beer.

A few belgian yeasts like this temperature as well as saisons but i doubt you are at that level of brewing.

Get yourself a box of some sort that the fermenter will fit in and use frozen bottles to keep it cool. I have an old fridge - effectively a large insulated box that i use to ferment in (in addition to the working fermenting fridge). 2 x 2L water bottles, frozen, rotated each morning (or both morning and evening if required) should have no problem keeping the temp down to 18-20C. I've even managed to get the temp down to 10C and ferment a lager changing the bottles twice daily.

20C is a good general rule for the max temp you want to ferment an ale yeast. Most lagers yeasts would be getting ugly at 12C or over. If using a kit yeast, keep it under 20C.

Dead fridges can be found in the hard rubbish. Check the website - freecycle in your local area of old working fridges. I got my working fermenting fridge this way by posting a wanted ad. Ugly, old, heavy fridge but it works and happily gets down to -2C in the fridge section.

Here is a pic of the dead fridge idea - Image
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