What does lagering a beer involve?
Let’s start by saying that you need to have a controlled temperature throughout the laagering process. Most brewers will use a refrigerator with an outside temperature control unit. The thermostat works in opposite of the refrigerator’s thermostat so that your temperatures do not end up too cold. The maximum temperature of most refrigerators is 40 °F. Before the brewing process has begun it is a good idea to prepare your fermentation environment a few days in advance to allow it a chance to stabilize. If you are intending to ferment your lager at a temperature of 48 °F, dial that temperature in on your thermostat a couple days before you begin to allow your refrigerator a chance to stabilize at this temperature.
