Chances of fire notwithstanding.I've been doing chickens seven years and I've never had a problem with heat lamps. I also never said that they were necessary at 30 degrees, just that if she was concerned about them she could use one. Certain breeds are less hardy in the winter, that's why I asked her about breeds. Heating lamps aren't the only option, either. You could also get a heated wall pad that is designed to radiate heat, but it won't burn to the touch and it's less of a fire risk.
Wyandottes and EEs are pretty cold hardy birds. They would be fine without a heat source. A heated dog bowl will work fine. I don't know what shape your bowl is, but if you have trouble with them knocking it over or spilling it then you could try TSC. At least where I'm at, they have heated bowls that widen at the base to prevent spilling. Good luck this winter and happy farming!
I've been keeping chickens off and on for over 60 years. Never used heat and never needed it with over 30 breeds in temps down to negative 19F.
The OP lives where it doesn't get cold.
It is a waste of electricity since it is unnecessary and negates any benefit from raising chickens.
It may make chickens cozy at night but stresses them when they have to go out into the cold wind in the morning.
If it is extremely cold and the power goes out at night (which it does in winter) chickens accustomed to heat will suffer since they haven't been acclimated to winter nights.
It increases humidity and the possibility for pathogens to flourish.
Did I mention chickens don't need heat?