I put a beer brew on just a simple wit barrel brew, but a cold snap here in nz has dropped the average temp to just below 20c and it has stopped bubbling away after only 4 days. Is there a cheap and easy way to get the temperature back up and keep it up. I don’t have a heating pad.
Go out and buy a hydrometer. And then actually measure the specific gravity.
If the specific gravity is dropping, then your beer is still fermenting regardless of how much “bubbling” it’s doing