What does "Temporary Hold" mean on a BG&E thermostat
There may be a way for BGE to disable the ac compressor but that is normally a special radio controlled switch outside. It is also unlikely that they would have done that on a day like today. So there is almost certainly something wrong with your ac unit. First step is to check outside for anything blocking the compressor - leaves etc. Beyond that I don't know - for me it would be time to call the hvac guy.

But the temporary hold is easy. On many thermostats if you override the temperature it is a temporary change until the next programmed change kicks in at a preset time. There is usually a way to do a more permanent hold with another button.

FYI, the reason you couldn't get info from BGE is they're not in the thermostat business. They're in the energy business and peak demand is their biggest concern because it affects profitability. One way they try to lower peak demand is by getting residential users to use automatic setback thermostats to lower ac usage during the day for people who are all out to work or school. The easiest way to do that is by giving away thermostats for free. And if you're a utility doing thousands at a time you can get them private labeled. But they're not really made by bge.