So far I've only had issues with high temps - on the low temps the ferment might be (much) slower but you get good beer consistently - with higher temps it's roulette and more times than not it'll taste like mango juice for the first month in the bottle
I think a lot of brewers would be jealous you can get a consistent temp that low
It isn't that hard to do this. All you need is a refrigerator in which the fermenter will fit, and a controller like an Inkbird.
I recently bought this small 4.4 cu ft refrigerator off Craigslist for $60:
In fact, after I bought that I saw another one, same size, that someone wanted $35 for. Grrr....
Anyway, if you get one of those, you can put a fermenter in there. Use a controller like an
Inkbird ($35) and you have a controlled fermentation chamber.
Inkbirds:
The Inkbirds control both the refrigerator (turning it on when the temp as measured by the temp probe) is too warm, and they'll also turn on a heat mat if too cool. In the pic above I have a fermwrap around my fermenter so I can bump up the temp to 71 for the yeast to finish. If you don't have a heat mat, you can just take it out and let it warm to room temperature.
Make sure if you did that you cover it so light isn't skunking the beer.
The inkbird vendor here puts them on sale from time to time. I bought my last one for $28 shipping included from Amazon.
If you know what you're looking for, you can spend a little time on Craigslist, or maybe a local Facebook for-sale group, and look for one of those minifridges. Get one cheap. Or you can get a larger one, like the green one in the picture, which works just as well.
At the same time, look here on HBT and see if the Inkbirds go on sale. If you're patient, I'll bet you can have GOOD fermentation temperature control for....$80? More or less?
Many have said, and I'd agree, that fermentation temp control is one of the biggest leaps forward a new brewer can take. If you start squirreling money away now, and keep an eye out for a fridge and the Inkbird, you can have the same thing I do--and many, many others here have as well.
PS: I can also ferment lagers at 50 degrees using this. A ferm chamber opens up a lot more recipes to the home brewer.