Firstly, where does Legionella come from?
Legionella is a bacteria found in most natural bodies of water throughout the world, and in man-made water systems such as hot tubs, cooling towers, fountains, some air conditioning systems, and showers. It is not found in chlorinated water systems or well water. The bacteria can be spread through airborne droplets, and people become infected when they breathe in contaminated mist or vapour.
Old plumbing systems can provide a hospitable environment for legionella to proliferate as well. If these systems are not properly maintained and cleaned, the chances of contracting Legionnaires’ disease increase significantly. It is important to keep these systems clean, sanitized, and well-maintained to reduce the risk of infection.
Thats all very well, you might say, but what are the risks of contracting Legionnaires disease from my air conditioning system?
The reality is, the risk is very small. The fact is, from an air conditioning system point of view, there are not that many a/c systems in the UK which are capable of allowing Legionella to proliferate. Your split system or VRF system, installed in your home, or office or shop is not at risk of giving you Legionnaires disease. This is because Legionella is a water-borne bacteria and does not thrive in the types of a/c systems which are used in the UK. In the UK we primarily use split systems, multi-split systems, VRF & VRV systems. These kinds of systems do not use water as a cooling agent, and, whilst its true these systems do generate condensate as a waste product, the water is not present in the conditions needed to allow legionella to proliferate.
What are those conditions? Good question! These are mainly:
Typically, these are not conditions found in the average UK a/c system - with the exception of Cooling Towers.
Oh, well what are Cooling Towers?
These are the often quite large systems, usually located on the rooftop of commercial buildings, which dissipate the heat from the water coolant which is used to cool down the hot components of large commercial a/c systems. This kind of system is not that common in the UK nowadays and is only ever seen on large commercial sites. We believe Legionnaires disease, whilst serious and of concern in larger commercial systems, is not an issue which the average user or owner of an a/c system in the UK will need to be worried about.
What are the dangers of Legionella?
Legionella bacteria can cause a potentially fatal form of pneumonia called Legionnaires' Disease, as well as the less severe Pontiac Fever. People exposed to Legionella bacteria can become very ill and even die from this infection. The symptoms of Legionnaires’ Disease include fever, coughing, chest pains, and difficulty breathing. Anyone can become infected with Legionella bacteria, but those at higher risk include people over the age of 50, smokers, those with chronic lung disease, people with weakened immune systems, and those who take medications that suppress their immune system.