I have the same issues in my home this winter. Mine did not get that low (around 60 in my closet) but it did in fact slow my stuff way down. I had a Hefe that was still rolling at 4 weeks. I finally had to move my aging bottles to a closet in my living room. This brought the temp up to around 67 and they seem to be working a lot better.
I am about to start working on a hutch that will be placed in my living room (which will look like a regular piece of furniture when closed up) and will be able to keep the brew in a more controlled temp.
There are also folks out there that will use a hot box with a thermostat and heating element to help with this. In my experience once the temp goes below 63 things start slowing way down.
On Deck - Imperial Stout, American Blond, Amber Mock Bock, "Cricket" #2
Primary - Dunkelweizen, Apfelwein
Bottled - Amber Wheat, Stout, Hefeweizen, Porter, Best Bitter