Aircon Cleaning vs Overhaul: What is the Difference?

When your aircon is underperforming, a technician might recommend either a "cleaning" or an "overhaul." In Thailand, these terms are used loosely, and some companies use "overhaul" to justify higher prices for what is essentially a standard cleaning. Understanding the real difference helps you avoid overpaying and ensures your unit gets the service it actually needs.

Standard Aircon Cleaning

A standard professional aircon cleaning is routine preventive maintenance that every unit needs every 3-4 months in Bangkok. Here is what it includes:

• Removing and washing the air filters
• Cleaning the evaporator coil with pressurized water and cleaning solution
• Cleaning the blower fan and fan housing
• Flushing the drain pan and drain line
• Wiping down the exterior housing and louvers
• Basic functional check after reassembly

Time: 45-60 minutes per unit
Cost: 300-800 THB per unit for wall-mounted splits
Frequency: Every 3-4 months for daily use in Bangkok

Standard cleaning is sufficient for units that are maintained regularly and do not have severe buildup or persistent problems.

Aircon Overhaul (Chemical Overhaul)

An overhaul goes significantly deeper. The indoor unit is partially or fully disassembled, and components are individually cleaned with specialized chemical solutions. This is sometimes called a "chemical wash" or "chemical overhaul."

• Full disassembly of the indoor unit from the wall
• Removal and separate cleaning of the evaporator coil, blower fan, and drain pan
• Chemical soaking of components to dissolve heavy buildup, grease, and stubborn mold
• Inspection of all internal components for wear, corrosion, or damage
• Checking electrical connections and capacitor
• Flushing and inspecting the entire drainage system
• Checking refrigerant pressure (and topping up if needed, at additional cost)
• Complete reassembly and thorough function test

Time: 2-4 hours per unit
Cost: 1,500-3,500 THB per unit for wall-mounted splits
Frequency: Once every 1-2 years, or when standard cleaning is no longer sufficient

When Do You Need an Overhaul?

Not every unit needs an overhaul. Here are clear signs:

• Unit has not been cleaned in over a year: Heavy buildup that standard cleaning cannot fully remove
• Persistent bad smell after cleaning: Deep mold in places standard cleaning does not reach. See our guide on aircon smells
• Water leaking after cleaning: Drain pan may be corroded or drain line severely blocked
• Reduced cooling despite recent cleaning: Coil buildup too thick for surface cleaning
• Unit is 5+ years old and has never had an overhaul: Accumulated internal buildup affects performance
• Kitchen or cooking area nearby: Grease buildup requires chemical treatment to dissolve

When Standard Cleaning is Enough

• Unit is cleaned regularly every 3-4 months
• No persistent odors or water leaks
• Cooling performance is satisfactory after cleaning
• Unit is under 3 years old with regular maintenance history

Beware of Upselling

Some companies will recommend an overhaul when standard cleaning would do the job just fine. Red flags include:

• Recommending overhaul for a unit that was cleaned recently (within 3-4 months)
• Insisting every unit needs an overhaul regardless of condition
• Not offering standard cleaning as an option at all
• Quoting overhaul prices for what is clearly just a standard cleaning

A reputable company will assess your unit honestly and recommend the appropriate level of service. Sometimes standard cleaning is all you need. Other times, an overhaul is genuinely necessary. The key is working with a provider you trust.

Comparison Summary

Feature	Standard Cleaning	Overhaul
Disassembly	Partial (filters, front panel)	Full (unit from wall)
Coil Cleaning	Surface wash	Chemical soak
Time	45-60 min	2-4 hours
Cost	300-800 THB	1,500-3,500 THB
Frequency	Every 3-4 months	Every 1-2 years
Includes Inspection	Basic	Comprehensive

Not sure what your unit needs? Contact us for an honest assessment. We will tell you whether standard cleaning or an overhaul is appropriate for your situation. We serve all Bangkok areas including Sukhumvit, Silom, Sathorn, and On Nut.