What techniques would you suggest for cooling a lager during the lagering phase? Further, how important is the stability of that temperature?

  • No-ones touched on the required stability of lagering temps yet. I'm curious how sensitive it is. Commented Jul 5, 2011 at 23:39
  • Bury the carboy in snow! The snow should keep the beer at 0-1 C
    – arnefm
    Commented Jan 20, 2016 at 19:27

9 Answers 9


Find a 4.2 cubic feet (or larger) minifridge on craigslist. I usually see them go for around $50 to $70, but YMMV depending on where you live. With the shelves removed, 4.2 cu. ft. should be large enough to hold a carboy.

Grab a temperature controller and use it with the minifridge. This will allow you to regulate the exact temperature inside, making it perfect for lagering, and for fermenting any other style of beer at the exact temperature you want. The Johnson Controls models are often highly recommended, but if the ~$80 price range is above your budget, I've seen them go on eBay for much less. You can also check your LHBS or look online -- there are often people getting rid of kegging setups that include them.

  • Agreed. Trying to keep a beer at lagering temperatures without some kind of fridge/freezer set-up is going to be more trouble than it's worth.
    – Simon
    Commented Nov 9, 2010 at 0:48
  • I'd recommend getting a minifridge without a freezer compartment. A carboy probably wont fit in a 4-5 cu. ft. fridge it has a freezer. It also makes it a lot easier to eventually convert it into a kegerator. Sadly, such minifridges can be hard to find. I scanned craigslist for a month for one before giving up and just buying a new one for about $175.
    – bengineerd
    Commented Nov 9, 2010 at 5:50
  • Sometimes its hard to get good descriptions off Craig's List. So when you go to check out a fridge, be sure to bring a 6.5 gal carboy and/or an ale pail with you to make sure they can fit in. I had to cut the shelves off the door of my fridge, but now it fits a bucket or a pail perfectly.
    – GHP
    Commented Mar 23, 2011 at 20:55
  • The Ranco controller is an excellent piece of hardware. I got mine off eBay from Patriot for $43 brand new. Wired the AC connection myself and it's been working flawlessly on my keezer for quite some time.
    – Bill Craun
    Commented Nov 4, 2011 at 0:01

Cheapest = Brew in the winter =P


I know this is an old question, but I see that it still gets some hits from time to time so I thought I would add a bit to my answer.

One of the benefits of this approach (besides the fact that no extra equipment is required) is that it gets you back to brewing's roots.

Seasons used to influence brewing in fundamental ways. The obvious way is that you are going to have warmer fermentation in warm weather and cooler in cold. But also because our taste in beer tends to go towards lighter in warm weather and heavier in cold.

Lagering was only available if you had cold weather or if you happened to have a handy cave system available. Technology definitely allows us to produce a more consistent product if we are willing to shell out the money.

However, I think there's something to be said about sticking close to our brewing roots. I personally find it fun and feel like it forces me to brew a larger variety of beer rather than sticking to the same few styles.

  • 1
    Not really very helpful.
    – Poshpaws
    Commented Jul 4, 2011 at 13:29
  • 2
    I think its the most budget friendly approach so far. I can't believe the accepted answer involves so much expense. SO much for "budget" lagering.
    – brewchez
    Commented Jul 5, 2011 at 0:25
  • 1
    Where I live it never reliably gets cold enough long enough to do this. So this is not an option for everyone. Plus who only wants to do lagers in the winter? Commented Jul 5, 2011 at 16:10
  • That even works for me in TX
    – Robert
    Commented Jan 20, 2016 at 20:57

Move to Minnesota, nature's refrigerator/freezer, where I live? Controlling added heat is much easier when your entire garage is 36-38F for 4 months of the year and you don't have to do much to get the cooling side of things.

  • :-) same with Manitoba, I'm insulating a small part of my basement off and it will be nice and chilly Commented Nov 9, 2010 at 3:15
  • 1
    I'm in Rochester NY. It goes from 75 to 25 in the course of a fall day. >.< Commented Nov 9, 2010 at 3:44

Dig a hole in your back yard! Seriously a small bunker type hole just big enough to fit your brew is fairly cheap to build. Build a well insulated roof for it, make sure it's sealed to keep out pests. Underground temperatures are much cooler than above ground in warm areas, and much warmer than above ground in cooler areas. The temperature stays fairly consistent. I recommend digging about 6 feet in your back yard and drop a thermometer in there and throw some insulation on top and see what the temp is.

Another option is underwater brewing in a pool (if you have one) but this is much more complicated and kids complain when they can't swim cause dad is brewing again. lol Here's a video of an undersea brewery!

Sunk Punk on Vimeo


This seems to be cheap and easy solution. If you have a cooler, you can probably pull the whole thing off for $20.

Bay Area Mashers

  • This really depends on how much effort you want to put into it and how closely you can monitor the temperature. I built a fermentation chiller (suburb.semo.net/jet1024/FermChill.htm) but I had to replace the ice every two days or so and that was after I spent a few weeks getting everything sealed nice and tight. I've since purchased a secondhand refrigerator and I'm getting temperature regulator. It was just too much work to monitor the temp closely.
    – Tim B.
    Commented Nov 9, 2010 at 20:21
  • Yeah. This project is heavy on the "budget" side. I agree this is going to take a lot of time to manage.
    – Scott P
    Commented Nov 9, 2010 at 21:18

Here are a couple of YouTube videos on how to use the Cool Brewing Fermentation cooler.

Cool Brewing Fermentation Cooler - How To Use Video!

Cool Brewing Fermentation Cooler (YouTube).


Earlier this year, Basic Brewing Radio covered this exact topic.

Basic Brewing Radio


There's also the Cool Brewing fermentation cooler ($55). It works surprising well as long as you change the ice packs (or whatever you use to cool it) every 12-24 hours.


In cold temp/climate. Use a temp controller. Basic unit is about $20 + parts to make an electrical box and cord for it. Put the sanitized probe into your fermenter. Wrap the fermenter with a blanket. Place it on top of a heating pad that is plugged into the temp controller. Set the desired temp and stash in a safe home in the unheated garage or shed. Great lager in 6 weeks or so.

In warmer temp/climate. Same as above except build a small box out of styrofoam insulation. Connect the controller to a small window AC unit that blows into the box. You'' need more space and a way for the AC condensate to drain.

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