If you want to get into a warm car, buy an in-car electric warmer. They install under the dash or on the passenger side kick panel. They are about 300-400 watts, and can also be put on the timer with the block heater. The block heater’s function is not to warm the car interior; it just makes it warm up quicker because the engine water jacket is already warm. The aditional benefit of an interior warmer is that it keeps the windows clear since the warm air is circulated by the fan.