Παραθέτω τα σοφά λόγια του Dr. White:
"Warmer starters (up to 98° F, 37° C) equal more rapid yeast growth, but there are practical limits as to how high you can go, and lager yeast tend to be especially sensitive to high temperatures. Using very high propagation temperatures negatively affects the viability and stability of the resulting yeast. Another problem with very rapid growth or excessive growth is that it can result in weaker cell membranes due to lower un-saturated fatty acid concentrations. Conversely, too cold a starter results in slower and often less growth, so we recommend against propagating yeast cold. A good rule of thumb is to keep starters between 65° F (18° C) and 75° F (24° C). Some brewers like to keep lager yeast starters a few degrees cooler and ale yeasts a few degrees warmer, but a temperature around the low 70s (72° F, 22° C) strikes a good balance of health and efficient propagation of both lager and ale yeasts."