That's a tough one living in a townhouse. Any chance of storing a few Duraflame logs under a bed / a closet / attic crawlspace? You already have the fireplace, so you might as well use it (Though I'd prefer a wood-burning stove). I doubt if your association rules will allow either kero or propane to be stored on the property. Do you have a propane grill out back? Grab that bottle if you have to. Just don't store propane inside! Also, fire extinguishers and CO detectors - a battery powered one.
If you must, can you block off a few doors and live in fewer rooms, heating only those rooms? Let the uninhabited rooms get cold. If you're friendly with other people in the building, ask them over. A few people will heat up a room with just their body heat. I suppose they could drag over a mattress and some blankets.