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Indoor humidity significantly affects comfort and air quality. Ideal humidity levels should be maintained between 30% and 50% to prevent mold growth and respiratory issues. Excess moisture can lead to mold in areas with stagnant air, while dry air can cause discomfort. Monitoring humidity with a hygrometer is recommended. For better sleep, indoor temperatures should be kept between 18°C and 20°C, although preferences may vary. Symptoms from mold exposure include respiratory issues and skin irritations, particularly in sensitive individuals.