Stick the one without heat inside a tied pillowase and put her under your shirt, get under the covers in a bed or something. If you have a heating blanket, plug that in and get everything toasty.

Get your female out of the 55gallon tank, it's very unnecessary. 15-32qt tub or 10-20gallon tank is all that is needed. Tubs are so much easier to heat and humidify in the winter, so you may want to make the switch before either of your snakes get sick. Digital thermometers are a MUST. These should have been bought BEFORE the snakes, so you knew what the temperatures/humidity in the enclosures were. It's not something that you should guess.

Snakes need proper heat and humidity in order to maintain their body temp and so they don't dry out from the inside out. Dry air causes respiratory distress, which can lead to respiratory infections if not taken care of.

If you experience power outages alot, PREPARE for it. 40 hour Heat Packs, 2 litre bottles with hot water, etc. It's not something you can just wing and hope for the best...