How cold can it be in July? If the weather is “cold”, switch on the cabin heater, this will cause the engine to run long enough to heat the engine coolant.
When emergency transports, best if engine starts immediately so warmer when soon subjected to aggressive acceleration up hills. One of the worst things on engines is greater loads while cold.
If not an emergency, we just drive gently and let it warm up as it does.
55º to 65º F. (Cold compared to Operating Temperature.)
Best to keep the increasing engine heat in the engine and not divert it into the vehicle interior.