What is a chemical overhaul?

A chemical overhaul involves taking apart both the indoor and outdoor units of an air conditioning system, then soaking and washing internal parts with chemical solutions before putting everything back together. This is distinct from a routine chemical wash, which targets the coils and visible surfaces while the unit remains largely intact. An overhaul is also more thorough than general servicing, which may include topping up gas, replacing filters, or light cleaning without full dismantling.

During a chemical overhaul, technicians remove components such as the evaporator coil, blower wheel, and drainage systems to access areas where mould and mineral deposits accumulate over months of use. These parts are then treated with cleaning agents to dissolve stubborn buildup that standard methods cannot reach. The process restores airflow efficiency and removes sources of musty odours or bacterial growth that can affect indoor air quality.

Contractors in Tampines recommend a chemical overhaul when an aircon has not been serviced thoroughly in several years, or when occupants notice reduced cooling performance, water pooling indoors, or persistent odours despite regular filter changes. This level of cleaning helps extend the lifespan of the system and prevent more costly breakdowns. It is a more time-intensive and specialised service than basic maintenance, so it should be ordered as a standalone job rather than part of a routine visit.