I think the key to lagering is to buy a fridge. My wife bought me a refrigerator for my birthday last month and it has come in handy for the lagering of the Maibock.
Right now, I have the cider that we made last October conditioning in there and some maple porters from two years ago.
I’ll get a thermostat for it eventually. This set up will eliminate the fusel alcohol issue I had last summer when my basement was in the high 70s in the month of August.
If you can get your hands on a used fridge, I think it is a good investment.