External HVAC threats can turn into significant expenses and interrupt household comfort. While today’s HVAC systems provide a long, expected service life, specific hazards affect certain outdoor system parts. For example, central air conditioner components including the compressor and condenser coil, which are installed in an outdoor unit behind or beside the house. The critical furnace vent, meanwhile, terminates on the roof, where it’s exposed to weather and wildlife. Here’s a rundown of external HVAC threats to outdoor cooling and heating components.
Weather Extremes
Heavy rain and associated roof runoff may cause pooling of water around the outdoor AC unit. While the unit is water-resistant, it is not waterproof against prolonged immersion. Deep standing water inundating the outdoor unit can damage sensitive electrical circuits, as well as the compressor motor.
Falling Limbs
Heavy tree limbs broken by wind or an ice storm pose external HVAC threats if they impact the outdoor AC housing and damage the upper fan grille and/or the condenser fan itself. Falling leaves may also clog the fan grille and obstruct exhaust airflow, reducing cooling efficiency.
Nesting Wildlife
The interior of the outdoor AC unit provides an attractive nesting spot for birds, possums, raccoons, and other animals. Nests can block proper condenser coil airflow.
The gas furnace vent pipe terminating on the roof exhausts toxic combustion byproducts, including dangerous carbon monoxide. If the vent cap is missing or loose, the open pipe may attract birds and other animals. Nesting material such as leaves may block exhaust and cause dangerous fumes to enter the house.
To Reduce External HVAC Threats:
Mount the outdoor AC unit on a solid pad, several inches above ground level to keep out water.
Cut back overhanging limbs that may break and impact the unit.
Install a commercially available cover on the AC unit during the winter to keep out leaves and heavy snow accumulation.
Secure side panels and the top grille to exclude animals.
Annually check the furnace vent cap and inspect the vent pipe for obstructions.
For professional help to identify and eliminate external HVAC threats, contact Air Assurance.