I put an amber ale in my primary a few days ago and the room temperature was around 70 degrees. Few days later we're having chilly weather and the room temp is down to 63 degrees. Not much action going on in the fermenter/air lock. I wonder if this is totally going to screw up my brew. I put a blanket around the fermenter hoping this might warm things up a bit, but the weather is something that's completely out of my control so I feel helpless. Is there anything I can do?