You need to find where your risers and pipes run. Whatever wall they run up through, put space heater next to the wall preferably at the level or below where they are frozen. If you have direct access to pipes through a panel then a hairdryer directly on to the pipe works well. It was still freezing last night so unless your walls have incredible insulation then they could still be frozen. I had to heat my house up to 70 with multiple sources of supplemental heat to thaw my pipes. It took about 2 hours for water to start running again. I had a whole floor without water as well.