Aircon is a year-round job in Singapore, and the North-East has every kind of it. New BTO households in Punggol and Sengkang buy installation with their renovation, then need a first service.
Older flats in Hougang and Ang Mo Kio lean toward repair, chemical cleaning and replacement. Pest work follows density and food outlets, which the heartland towns have plenty of, and drainage near parks and waterways.
Leaks show up after the wet months of the Northeast monsoon, from December to March, and older blocks show them first. Renovation in HDB flats comes with permit and contractor rules, and pest and building work sit under NEA and BCA as relevant.
Speed matters in a hot flat, but a scheduled service is a different customer.