Here is a pattern I see in my clinic repeatedly: a child who coughs all winter — indoors, at night, in school — but seems fine during the summer holiday in Europe. Parents assume the UAE climate must be helping. In reality, the opposite is true. The culprit is not the outdoor air. It is the indoor air, and specifically the air conditioning that runs almost every hour of every day in homes, schools, and cars across the UAE.
Why air conditioning drives allergic airway disease in children
Air conditioning in the UAE is not a luxury — it is a survival necessity for most of the year. But running a sealed, recirculated air environment for 10–12 months a year creates specific conditions that promote allergic disease and airway irritation in children:
House dust mite explosion
House dust mites thrive at temperatures between 20–25°C and humidity above 70%. An air-conditioned home in Dubai, with its sealed windows and bedrooms kept at a comfortable sleeping temperature, provides near-perfect conditions year-round. In naturally ventilated homes in cooler climates, mite populations fall in winter. In Dubai, they don't.
House dust mite allergen — specifically the protein Der p 1 from mite droppings — is the single most common trigger for allergic asthma and allergic rhinitis in children in the UAE. It is invisible, pervasive, and present in every mattress, pillow, carpet, and soft toy in your home.
Mould growth in AC units
Air conditioning systems that are not cleaned regularly accumulate moisture in the drip tray and on the evaporator coils. This moisture supports mould growth — and the AC unit then blows mould spores directly into the room air. Mould spores, particularly Aspergillus and Cladosporium species, are potent airway irritants and allergens. A child sleeping near an unserviced AC unit is being exposed to a steady stream of mould spores throughout the night.
Dry, cold air irritating the airways
Cold, dry air is a direct airway irritant — it stimulates cough receptors and can trigger bronchoconstriction in sensitised children. Many families in Dubai set their AC to 18–20°C or lower, particularly in bedrooms. This is significantly colder than the optimal sleeping temperature and well below the temperature at which airway irritation becomes a clinical problem for children with sensitive airways.
Sealed buildings trapping indoor allergens
When windows stay closed, indoor allergens — pet dander, cockroach allergen, cleaning product fumes, and cooking emissions — accumulate rather than being diluted by fresh air. UAE buildings are particularly well-sealed for thermal efficiency. The result is a concentration of airborne allergens that can be significantly higher indoors than outdoors.
How to tell if AC is driving your child's cough
The pattern is characteristic and worth recognising:
- Cough that is worse at night and first thing in the morning — the hours spent in the bedroom with AC running
- Cough that improves or disappears on holiday outside the UAE, particularly in cooler or more ventilated environments
- Cough that is worse in winter (when AC runs hardest and buildings are most sealed) despite the outdoor air being cleaner
- Associated nasal symptoms — blocked nose, sneezing, clear runny nose — suggesting allergic rhinitis driven by indoor allergens
- Symptoms that worsen when the child is in school (where large AC systems may be poorly maintained)
What you can do at home — a practical checklist
- Service your AC units every 3–6 months. Clean or replace filters. Have the coils and drip tray professionally cleaned annually. This single step can make a significant difference to mould spore levels in your home.
- Use allergen-proof mattress and pillow covers. These fine-weave covers create a physical barrier between your child and the thousands of dust mites living in the mattress. They are available online and make a measurable difference to allergen exposure.
- Wash bedding weekly at 60°C. Hot water kills dust mites. A 40°C wash leaves them alive. If your washing machine doesn't reach 60°C, tumble drying on high heat for 20 minutes after washing achieves the same effect.
- Set bedroom AC to 22–24°C, not lower. Your child does not need to sleep in a cold room. A slightly warmer bedroom reduces direct airway irritation and still provides comfortable sleep.
- Raise the AC slightly off the floor in the bedroom. Directing cold air across the ceiling rather than directly at the bed reduces the concentrated cold airflow your child breathes.
- Consider a HEPA air purifier in the bedroom. Running overnight, a quality HEPA purifier significantly reduces airborne dust mite allergen, mould spores, and other particles.
- Remove carpets from the bedroom if possible. Hard floors are dramatically easier to keep allergen-free. Carpets trap dust mites, pet dander, and other allergens regardless of regular vacuuming.
- Vacuum with a HEPA-filter vacuum cleaner. Standard vacuum cleaners re-suspend fine particles back into the air. A HEPA-filter model captures them.
When environmental measures are not enough
If you have implemented these measures and your child is still coughing — or if the cough has been present for more than four weeks — a specialist assessment is warranted. In clinic, I will:
- Take a detailed history including the indoor environment, AC habits, and any seasonal or location-related patterns
- Perform allergy skin prick testing or specific IgE blood tests — particularly for house dust mite, which is positive in the majority of allergic children in the UAE
- Measure FeNO (fractional exhaled nitric oxide) — a non-invasive test that detects eosinophilic airway inflammation, often driven by allergen exposure
- Perform spirometry to assess lung function and look for asthma
If house dust mite allergy is confirmed and symptoms are persistent, allergen immunotherapy — either sublingual drops or tablets taken daily — can reduce allergen sensitivity over time. This is a long-term treatment but one that can meaningfully change the course of allergic airway disease.
