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That's good for the Cummins in my opinion.The block heater is recommended by Ram to use when the outside temperature is 0°F or below, I use mine to help get up to operating temperature quicker. I have a smart plug programmed to turn on a couple hours before I plan on leaving if the outside temperature is less than 40°F
Why would you need it there?By gosh, I have had to use mine, even down here in sunny Southern Arizona. Though, not all night. I only plug it in when I get up in the morning.
I use it only after "cold" nights in winter. Because diesel engines do not like to start or idle cold. Even if only 40 - 50 degrees. Its far far healthier for the engine to be able to start warm. Prevents blow by into the crank case, and extends the life of batteries and the DPF filter.Why would you need it there?
I use my block heater whenever the overnight temp is -15C or lower. If it is really cold outside I also have a heated battery blanket and a 2 amp smart charger on a second cord. I use a timer to turn them on about 3 hours before my departure time. Makes a huge difference in how fast it warms up and reducing the painful sounds of that cold startup.