I believe it's the same as in your home, or at least in mine. There are different theories of how much heat is needed to grow a plant.
The "Kelvin" theory says that each individual plant needs a different amount of heat. It's been estimated that a plant needs between 4 and 20°C above its ideal growth temperature to grow normally. But this is only an estimate. That's because the plant will adjust its rate of growth to match the temperature. The "Thermal Time" theory says that plants need to absorb enough heat to bring them up to the right temperature, then stay there for the time it takes to complete one cycle of growth and then go back down again. So they need more than one degree of heat to do that. The "Time and Temperature" theory says that you don't need to give your plant any more than the time it takes to complete one cycle of growth and then go back down again. This means that the amount of heat is less than the time and temperature theory