Because your crop is a fungus, four things follow. First, the substrate must be clean, because other fungi and bacteria want the same food. That is what growers call contamination.
Second, the temperature that matters is inside the bag, not on the wall. Third, a mushroom is mostly water, so humidity in the air and gentle handling decide its quality. Fourth, there are no roots. A dry bag cannot be rescued by watering like a pot plant. The water must be in the substrate from the start.