Can air conditioning make you sick? 5 myths about AC systems
Air conditioning is often blamed for everything from summer colds to dry skin, but how much of this is fact, and how much is fiction? Misinformation about AC systems circulates widely, leading to unnecessary concerns and, in some cases, inefficient usage.
To set the record straight, we are breaking down five common myths about air conditioning — separating speculation from science.
1. Myth: air conditioning spreads colds and flu
It’s a common belief that sitting in an air-conditioned room for too long can leave you with a sore throat or runny nose. In reality, air conditioning itself does not create illness. Viruses and bacteria are the true culprits behind colds and flu, not the temperature of the air.
However, poor maintenance can be an issue. If filters and ducts are not cleaned regularly, they can circulate airborne particles, including dust and allergens. A well-maintained system, on the other hand, improves indoor air quality by trapping pollutants and reducing the spread of airborne contaminants. The key takeaway? AC units do not cause illness, but neglecting maintenance can contribute to poor air quality.
2. Myth: air conditioning dries out the air
Many assume that air conditioning removes all moisture from the air, creating an uncomfortably dry indoor environment. While cooling systems do reduce humidity, they are designed to maintain a balanced level rather than strip moisture completely.
In high-humidity environments, this dehumidifying effect is beneficial, preventing dampness, mould growth, and the musty odours that often come with excessive moisture. If an AC system is causing excessive dryness, it may be due to incorrect settings or an outdated unit. Smart thermostats and modern humidity control features now allow users to fine-tune their indoor climate, ensuring optimal comfort without over-drying the air.
3. Myth: sleeping with the air conditioning on is bad for your health
There is a persistent belief that sleeping in an air-conditioned room can cause headaches, stiffness, or even respiratory problems. In truth, sleeping with the AC on is not inherently harmful — provided the temperature is set correctly and the unit is properly maintained.
Extreme temperature drops can make the body work harder to regulate itself, leading to discomfort. Instead of blasting cold air, experts recommend setting the thermostat to a moderate, steady temperature (typically between 18°C and 21°C) for a restful night’s sleep.
For those prone to allergies, ensuring that filters are regularly changed will prevent dust and pollen from circulating overnight. With the right adjustments, air conditioning can actually enhance sleep quality by creating a comfortable and controlled environment.
4. Myth: air conditioning is a breeding ground for bacteria and mould
While it is true that bacteria and mould thrive in damp conditions, a properly installed and maintained AC system does not create these problems. Issues arise when units are left unchecked for extended periods, allowing moisture to accumulate in drip trays and ducts.
Most modern air conditioning systems incorporate antibacterial coatings and self-cleaning features to prevent microbial growth. Routine servicing, including cleaning filters and checking drainage, eliminates the risk of mould build-up. When correctly cared for, an air conditioning system actively improves air quality rather than compromising it.
5. Myth: air conditioning is harmful to the Environment
Concerns about the environmental impact of air conditioning are valid, but advancements in technology have significantly improved efficiency and sustainability. Older models were indeed energy-intensive, but modern systems are designed with eco-friendly refrigerants, high-efficiency compressors, and smart controls to reduce energy consumption.
Businesses and homeowners can further minimise environmental impact by:
- Choosing energy-efficient models (such as those with A+++ ratings).
- Regularly servicing systems to maintain peak efficiency.
- Using programmable thermostats to avoid unnecessary cooling.
- Opting for renewable energy sources where possible.
Air conditioning, when used responsibly, does not have to be at odds with sustainability. By selecting the right system and optimising usage, it is possible to maintain comfort while keeping energy consumption in check.
The bottom line
The idea that air conditioning makes people sick is largely rooted in misconceptions. While poorly maintained systems can contribute to air quality issues, a properly installed and serviced unit enhances indoor environments by regulating temperature, controlling humidity, and filtering out airborne particles.
Rather than avoiding air conditioning out of misplaced concern, the focus should be on regular maintenance, responsible usage, and investing in energy-efficient technology. With the right approach, air conditioning remains a valuable tool for comfort and well-being — without the myths attached.
If you’d like to learn more about air conditioning maintenance, installation or repair, explore our expert services.
