Bus firms lift AC minimum to 25 degrees as fuel costs climb

Hong Kong’s two major franchised bus operators, KMB and Citybus, have issued internal guidelines to curb fuel use amid rising global oil prices, setting a minimum cabin temperature of 25 degrees Celsius.

The move comes as instability in the Middle East continues to push up energy costs, adding pressure on transport operators.

According to internal notices circulating online, KMB has adjusted cabin temperatures to between 25.5 degrees and 27.5 degrees, while Citybus has advised drivers to switch off air conditioning and open windows during non-passenger journeys. Drivers are also told not to start engines or pre-cool buses with air conditioning before departing termini.

The measures have drawn mixed reactions. Some commuters said the steps were understandable given rising fuel costs, while others complained of weaker airflow and warmer conditions, raising concerns over comfort during the summer.

Industry insiders noted that measures such as turning off air conditioning when buses are out of service would not directly affect passengers. They added that cabin temperatures are typically controlled by preset systems rather than individual drivers.

The Motor Transport Workers General Union warned that high temperatures and poor ventilation could pose health risks for drivers and affect road safety.

The union urged authorities to intervene, calling for cabin temperatures to be lowered to around 23 degrees. It also suggested installing fans in driver cabins and sharing fuel cost savings with frontline staff.

The Transport Department said the guidelines largely reflect existing practices, including reducing engine idling and avoiding harsh acceleration or braking.

It added that switching off air conditioning during non-passenger journeys is advisory, and drivers may exercise discretion based on actual conditions.

Authorities stressed that operators should maintain communication with staff and ensure that measures do not compromise passenger service or driving safety.