Most urban dwellers are familiar with the common sight of pigeons fluttering about, perching on ledges, and occasionally nesting in various nooks and crannies of buildings. While these birds might seem innocuous, even endearing to some, there's a growing concern tied to a place they often choose to nest near to, on or within air conditioning systems. Such a nesting choice isn't merely a nuisance, it can pose a genuine health and operational risk, especially for centralized air handling units that pull in fresh air from the outside. Allowing pigeons to nest near to, on or within air conditioning systems can lead to mechanical malfunctions, increased maintenance costs, and severe health hazards due to the potential ingestion of pigeon faeces into the building's air supply.
While pigeons might be a ubiquitous presence in our cities, the dangers of allowing them to nest on air conditioning systems are too significant to ignore. Beyond the mechanical implications, the potential health hazards underscore the urgency of addressing this issue. Building managers and homeowners alike should prioritize preventative measures, such as installing bird deterrents or regular inspections, to ensure the safety and efficiency of their air conditioning systems. By understanding and acting on this concern, we can ensure a safer and healthier urban environment for all.
The Mechanical Hazards that Cause Issues to the HVAC System:
Nesting Material Blockages: Pigeons gather twigs, leaves, and other debris to construct their nests. When these materials become lodged in the external components of an air conditioning system, they can impede airflow across the coil making the system work harder and reducing its efficiency. Over time, this strain can lead to a breakdown of the system.
Corrosion and Damage: Pigeon droppings are acidic. Continuous exposure to these droppings can cause corrosion of the air conditioner's metal components such as the copper alloy coil, reducing the lifespan of the system and necessitating premature replacements.
Health Concerns:
Ingestion of Pigeon Droppings: Centralized air handling units that pull air from the outside can, at times, inadvertently draw in pigeon feces if nests are situated nearby. Once these droppings enter the building's ventilation system, they can become aerosolized, leading to potential inhalation by building occupants.
Disease Transmission: Pigeon droppings can harbor various pathogens, including fungi like Cryptococcus and bacteria like Salmonella. When droppings get ingested into a building's air supply, occupants are at risk of respiratory infections and other diseases.
Economic Implications:
Increased Maintenance Costs: Systems plagued with nesting pigeons often require more frequent servicing. The cost of removing nests, coupled with the repairs due to damages, can add significantly to maintenance budgets.
Decreased System Lifespan: As previously mentioned, the strain from blockages and corrosion can lead to system breakdowns, resulting in expensive replacements.
Dealing with pigeons nesting on air conditioning systems requires a combination of preventative and responsive measures. Here are some of the most effective solutions:
Physical Barriers:
- Netting: Installing bird netting around the AC units prevents pigeons from accessing the area. Ensure the mesh is fine enough to prevent small birds from getting through but not so tight as to restrict air flow.
- Spikes: Bird spikes can be placed around the perimeters of AC units. They discourage pigeons from landing and nesting, as the uneven surface is uncomfortable for them.
- Sloped Sheathing: Using sloped or slippery surfaces makes it difficult for pigeons to get a foothold, deterring them from nesting.
Electronic Devices:
- Ultrasonic Repeller: These devices emit high-frequency sounds that are unpleasant for pigeons but are generally inaudible to humans.
- Electromagnetic Pulse Devices: These produce electromagnetic fields that disturb pigeons' sense of direction, deterring them from the area.
Visual Deterrents:
- Reflective Objects: Hanging CDs, aluminium foil, or shiny tape can deter pigeons because the reflections are disorienting and uncomfortable for them.
- Fake Predators: Fake owls, hawks, or snakes can scare pigeons away. However, pigeons might get used to them over time if they're stationary, so it's essential to move them around periodically.
Gel Repellents: These are sticky substances that can be applied to surfaces where pigeons might land. They dislike the sticky sensation, and over time, they'll associate the discomfort with the location and stay away. However, ensure the gel doesn't restrict airflow or seep into the system.
Habitat Modification: If possible, eliminate food and water sources nearby. A less hospitable environment will make the area less attractive to pigeons.
Regular Maintenance and Inspection: Regularly inspect the areas around AC units. Quick removal of nesting materials can deter pigeons from returning. Jetwash the area to maintain cleanliness.
Safe Relocation: If pigeons have already nested, consider hiring professionals to safely remove and relocate the birds and their nests.
Educate the Public: Often, the public isn't aware of the potential problems associated with feeding pigeons. An informed public might be less likely to feed pigeons near buildings, reducing the attraction for the birds.
Biological Solutions: Introducing natural predators, like hawks or falcons, in areas with severe pigeon problems can be an effective, albeit more involved, solution. Some businesses even hire falconry services to patrol and deter pigeons.
Legislation and Regulations: Some cities have regulations against feeding pigeons or have pigeon population control measures in place.
Contact Us:
Orion Air Conditioning And Refrigeration Limited
10 Grisedale Court
Woburn Road Industrial Estate
Kempston
Bedfordshire
MK42 7EE
United Kingdom
Sales & Spares: +44 (0)1234 841221
Fax: +44 (0)1234 852662
Email: info@orionair.co.uk
Created 06/10/23
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