How does air conditioning affect indoor air quality?
Your air conditioner does more than change the temperature. It pulls air from the room, passes it through a filter and over a coil, and sends it back out. A clean, well-maintained system filters out particles and removes humidity; a dirty one can spread dust, allergens and mould spores through the home.
Indoor air quality affects how you breathe, sleep and feel. With a few changes to how your system is set up and maintained, you can reduce allergens and pollutants and make the home more comfortable. Here are practical steps that work in Gold Coast and Northern Rivers homes.
What affects indoor air quality?
Four things matter most: allergens such as pollen, dust mites and pet dander; fine airborne particles such as dust and smoke; volatile organic compounds (VOCs) given off by household products and furnishings; and humidity, which in a subtropical climate is often too high in summer.
- Allergens: pollen, dust mites, pet dander and mould spores can trigger allergic reactions and aggravate asthma.
- Airborne particles: fine dust, smoke (including bushfire smoke) and traffic pollution irritate the airways.
- VOCs: chemicals released by cleaning products, paints, new furniture and building materials. Ventilation is the main fix; filters do not remove most of them.
- Humidity: too much encourages mould, mildew and dust mites; too little dries skin and airways.
How can you use your air conditioning to improve indoor air quality?
Use a good filter and keep it clean, consider a UV sanitiser, control humidity, and have the system serviced so the coil, drain tray and ducts stay clean. These steps reduce what the system recirculates and stop it becoming a source of mould or dust itself.
Use high-quality air filters
Every split system and ducted system has a filter on the return air. Upgrading a ducted system to a higher-grade return-air filter captures more fine dust and allergens. The filter needs to suit the system’s fan, so ask your technician which grade will work without restricting airflow.
Clean or replace filters regularly
A clogged filter lets less air through and catches less dust. Clean split system filters every few weeks in heavy use, and check ducted return-air filters every few months, following the manufacturer’s guidance. It is the simplest and cheapest thing you can do for air quality.
Consider HEPA filtration
HEPA filters capture a very high proportion of fine particles, including pollen, dust and pet dander, which is why they suit allergy and asthma sufferers. However, they are so dense that most home ducted fans cannot push enough air through them. Portable HEPA purifiers in bedrooms, or a higher-grade filter matched to your ducted system, are the practical alternatives.
Install a UV air sanitiser
UV-C light inactivates bacteria, viruses and mould spores and helps keep the indoor coil clean. We supply and install the Fresh-Aire UV APCO-X filter and sanitiser for ducted systems, which combines filtration with UV treatment of the air passing through.
Maintain healthy humidity levels
On the Gold Coast, the problem is usually too much humidity, not too little. Cooling mode removes moisture as it cools, and dry mode removes moisture with less cooling, which is useful on muggy, mild days. A correctly sized system matters here: an oversized unit cools quickly and switches off before it has removed much moisture. In dry inland areas, a humidifier may help in winter, but it is rarely needed on the coast.
Schedule regular maintenance
An annual service should include cleaning filters and coils, checking the condensate drain and tray (a common source of musty smells), checking refrigerant and inspecting accessible ductwork. Our rejuvenation eco clean goes further on the coil and fan. See air conditioning maintenance.
Why might you wake up tired with the air conditioning on?
If you wake up stuffy, congested or tired after running the air conditioner overnight, check for a dirty filter or coil, a bedroom set too cold, cold air blowing straight onto the bed, or a closed room with stale air. Most of these are quick to fix, and a service sorts out the rest.
Set the bedroom between 25 and 27°C, use the sleep or night mode if your unit has one, and angle the louvres to the ceiling. If the room smells musty when the system starts, mould may be growing on the coil or in the drain tray, and the system needs a professional clean. For ducted systems, zoning lets you cool only the bedrooms at night, which is quieter and cheaper.
What is the bottom line?
Your air conditioner can make your indoor air noticeably cleaner and more comfortable, or worse, depending on how it is looked after. Clean filters, sensible humidity control, the right filtration and regular servicing give you a healthier home. To book a service or ask about filtration, contact us.