Humidity plays a crucial and often underestimated role in indoor air quality, impacting both your comfort and health. Maintaining the right balance is key:
High Humidity (above 50-60% Relative Humidity)
- Mold and Mildew Growth: This is the most significant issue. Mold thrives in damp environments and releases spores that can trigger allergies, asthma attacks, and other respiratory problems.
- Dust Mites: These microscopic allergens flourish in high humidity, worsening allergy and asthma symptoms.
- Bacterial and Viral Growth: Many bacteria and viruses survive and reproduce more effectively in humid conditions.
- Chemical Off-Gassing: High humidity can increase the rate at which certain building materials and furnishings release Volatile Organic Compounds (VOCs) into the air which can be irritating or harmful.
- Musty Odors: Excessive moisture often leads to unpleasant, musty smells.
- Reduced Air Circulation: Humid air can feel heavy and contribute to a stagnant indoor environment that traps pollutants.
Low Humidity (below 30% Relative Humidity)
- Dryness and Irritation: Low humidity can dry out nasal passages, throats, and skin leading to discomfort, cracked skin, and increased susceptibility to colds and respiratory infections.
- Increased Virus Survival: Some viruses (like influenza) actually survive longer in drier air, increasing their airborne transmission.
- Static Electricity: Annoying and can damage electronics.
- Damage to Home Furnishings: Dry air can cause wood furniture, floors, and even paint to crack or warp over time.
Ideal Humidity
The U.S. Environmental Protection Agency (EPA) and other health organizations recommend keeping indoor relative humidity between 30% and 50%. This range helps minimize the growth of harmful microorganisms and allergens, prevents excessive dryness, and contributes to overall comfort and a healthier indoor environment. Your air conditioner plays a vital role in achieving this balance by removing excess moisture during the cooling process.
