Heater not working?

[SofieSoyy]

HI so I just came home today from being out of town for 3 nights. When I left my tank was all good but I noticed just one the whole tank is cold and has condensation on the outside. I do have a heater in there but it's not regulating the temperature it's almost 10 pm here and I cannot get a new heater until tomorrow. How can I help my first not freeze

 

[esims12]

What kind of fish are in it and what is the current temp?