The air conditioner isn’t cold enough, has a bad smell, leaks water, or causes nasal allergies?

95% of the time, it’s because the air conditioner hasn’t been cleaned for too long — it’s too dirty.

Why should you regularly clean your air conditioner and dehumidifier?

Johnson Group air conditioner cleaning and sanitizing

Whenever you turn on the air conditioner, the indoor air quality is directly affected by the cold air it blows out. In fact, how clean the air is depends largely on when you last cleaned your unit.

Unclean air conditioners can contain over 6 million bacteria.

Research shows that the bacteria count inside an air conditioner can reach up to six million — twice as dirty as raw meat from the market. If your air conditioner has not been professionally cleaned, a musty smell is a clear sign of mold growth. The bacteria and mold inside are then circulated throughout the room with the airflow, and long-term exposure can trigger allergies, pneumonia, or even Legionnaires’ disease.

Washed the filter but still smells bad?

Although inverter air conditioners are known for their energy efficiency, they dehumidify less effectively during low-power operation. This leaves moisture inside the unit, creating an ideal environment for mold. Even if you clean the filter regularly, deep internal buildup may still cause unpleasant odors and reduce cooling performance. Attempting to clean the inner components yourself could damage the machine, so it’s best to leave it to a professional air conditioner cleaning service.

Johnson Group Air Conditioner and Dehumidifier Cleaning Service

Johnson Group provides transparent pricing based on air conditioner models, following a standardized deep-cleaning procedure that includes full dismantling, eco-friendly cleaning agents, and an anti-mold coating. Our service removes up to 99% of mold and bacteria, instantly restoring clean air and cooling efficiency so you can enjoy a fresh, comfortable home environment.

70 Years of Expertise and Assurance

Our cleaning team has years of hands-on experience and undergoes technical training to follow our 7-step professional cleaning procedure. We serve both residential and commercial clients across Hong Kong and have earned strong customer trust. Whether it’s a split-type, window-type, ducted, or ceiling-concealed air conditioner, we offer customized cleaning and sanitizing solutions.

Comprehensive Mould Removal and Prevention

After cleaning, we apply AerisGuard™, an anti-bacterial and anti-mold coating certified by the U.S. Environmental Protection Agency (EPA). This coating effectively inhibits the growth of bacteria and mold, providing long-lasting protection for at least 12 months, allowing our customers to enjoy peace of mind for the long term.

The Gentlest, Greenest Cleaning Solution in the Industry

We prioritize eco-friendly materials, using industrial-grade equipment and natural, plant-based cleaning agents that eliminate 99.99% of bacteria and viruses. Our cleaning solutions are safe for humans and the environment, making them especially suitable for households with children and pets.

Book Johnson Group AC Cleaning & Mould Removal Service|Enjoy Limited-time Deals on Yohome Appliances!

Limited-Time Add-on Offer

From now on, book our Air Conditioner Cleaning to enjoy exclusive limited-time add-on deals on Yohome appliances!

Limited quantities available, while stocks last. Book now and create a fresh, mould-free living environment!

Air Conditioner Cleaning & Sanitizing Service

Special Offer – Upon Spending A Designated Amount
Free SmellGREEN® Natural Cleaning Disinfectant

Receive 2 bottles of SmellGREEN® Natural Cleaning Disinfectant (100ml) upon spending $2,000 on Johnson Group’s Air Conditioner Cleaning Service, and receive 4 bottles upon spending $3,800.

The gifts will be delivered on the day of service. Limited quotas while stock lasts!

Air Conditioner Cleaning and Dehumidifier Cleaning Service Scope

窗口式冷氣機清洗

Window-type Air Conditioner Cleaning

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掛牆式分體冷氣機清洗

Wall-mounted Split Air Conditioner Cleaning

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藏天花式四面出風冷氣機清洗

Concealed Ceiling 4-way Cassette Air Conditioner Cleaning

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風喉式冷氣機清洗

Ducted Air Conditioner Cleaning
*Depends on the size and location of the access panel

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吊天花式口琴冷氣機清洗

Ceiling-suspended Horizontal Air Conditioner Cleaning

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抽濕機

Dehumidifier Cleaning

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Google 5-Star Customer Review

Budding Tree profile picture
Budding Tree
10:11 24 Feb 26
Very professional and proficient technicians. Their support team are also very thorough. I have utilized their services for annual AC cleaning and deep carpet cleaning.
Darryl Cheng profile picture
Darryl Cheng
10:01 28 Jan 26
Super professional and methodical. Would use again.
D H S profile picture
D H S
08:51 28 Jan 26
10/10 service!! I was recommended by a friend about Johnson Group and I am beyond satisfied about the service. They are super friendly throughout the entire booking and post-booking process, and they are extremely professional! The guys who came in to do the pest control service were very diligent and meticulous about inspecting every corner/area of the apartment. They also were very patient, kind, and helpful about any further questions I had and gave me good recommendations/advice about the best practices/products for preventing bugs! I would definitely reach out again if I ever have pest issues and recommend them to anyone in the Hongkong area 🙂
L Z profile picture
L Z
09:24 19 Dec 25
Highly recommended for meticulous and conscientious work.
Clarissa LC profile picture
Clarissa LC
06:06 11 Dec 25
I have used the Johnson Group on multiple occassions and they never disappoint. They have excellent communication with their customer service, and the execution of service is top notch. They are very diligent and I am always happy to book them.
Esther LAM profile picture
Esther LAM
09:57 14 Nov 25
The technician was professional and meticulous. Before the procedure, he laid out any potentially contaminated home items, and after finishing, he cleaned the floor before leaving. He also taught us how to prevent mold from recurring. 👍🏻
Wesley Wong profile picture
Wesley Wong
06:16 13 Oct 25
Gianni Galeota profile picture
Gianni Galeota
04:58 27 Aug 25
I’m extremely satisfied with the service I received. The work was carried out with great professionalism and attention to detail. Every aspect was handled carefully and thoroughly, showing a real commitment to quality.
I highly recommend this service.
Kelvin Chan profile picture
Kelvin Chan
07:38 26 Aug 25
Cleaning after a tenant moves out is such a hassle. The Johnson Group technicians took care of all the stains right away, paying attention to every detail! I'm so satisfied!!
Tung Ming Lou profile picture
Tung Ming Lou
08:02 19 Aug 25
The service is fast and dedicated, the process is proficient, the explanation is detailed, and the pest control is careful. From the customer service guy to the master who came to the door to control the pests, everything is impeccable. The price is fair and it is worth recommending.
G Taylor-Thomas profile picture
G Taylor-Thomas
03:24 08 Aug 25
Johnson came to clean my studio flat after a series of tenants and renovation. Their team worked tirelessly and left the flat spotless and like new. I have no hesitation in recommending them.
黃千嬅 profile picture
黃千嬅
04:18 16 Jun 25
Very professional
Photo from customer review

Don’t rush to top up refrigerant if your air conditioner isn’t cooling! Under normal use, refrigerant never gets consumed or leaks. Long-term lack of cleaning is what affects airflow and cooling performance.
Talk to our experts to learn how to restore your air conditioner’s efficiency and enjoy refreshing coolness again.

Contact Us

Tel: 2481 3988|WhatsApp: 5412 3517

Professional Steps of Air Conditioner and Dehumidifier Cleaning

我們採用標準化的7步驟,確保每部冷氣機得到最徹底的清潔。

Remarks: The cleaning and disinfection service excludes electronic circuits, motors, radiators, and outdoor units. Actual anti-mold performance may vary depending on usage and environment.

Hospital-grade Standardized ProcessDeep Cleaning with Simultaneous Disinfection and SterilizationNatural & Non-toxic CleanersAnti-mould and Anti-bacterial Protection for 12 monthsSuitable for Sensitive Groups

Our Exclusive Cleaning Materials

AerisGuard™ Mould Cleaner & Remover - Johnson Group

AerisGuard™ Mould Cleaner & Remover - Johnson Group

  • AerisGuard™ Cooling Coil Cleaner:
    AerisGuard™ Cooling Coil Cleaner is made from bio-active enzymes that can be used on cooling and heat exchange surfaces to remove biofilm, bacteria, fungi, and mold, keeping the cooling coil clean. The cleaner is pH-neutral and will not damage cooling or heat exchange surfaces.
  • AerisGuard™ Cooling Coil Coating:
    AerisGuard™ Cooling Coil Coating (protective coating) is certified by the U.S. Environmental Protection Agency. The active antimicrobial agent is slowly released to prevent the growth of organic matter (mold and bacteria), protecting the cooling coil and heat exchanger fins, providing up to 12 months of protection.
  • AerisGuard™ Unit Body Coating:
    AerisGuard™ This coating is specially designed for the unit body/shell to ensure treated surfaces remain free from harmful contamination. Certified by the U.S. Environmental Protection Agency.

SmellGREEN® Natural Disinfectant

  • Effectively eliminates 99.99% of bacteria and viruses
  • Plant-based ingredients
  • Non-toxic, non-corrosive, pH 8
  • Very safe for children, pets, and the environment
  • Leaves no color residue on surfaces or skin
  • Meets strict food safety requirements
  • 100% biodegradable
  • Tested by Hong Kong Standards and Testing Centre with 99.99% antimicrobial efficacy
  • Registered with U.S. EPA and Health Canada
  • Made in Canada

Benefits of Air Conditioner Cleaning

Air conditioners are breeding grounds for allergens, bacteria, and mold. When dust accumulates on the cooling coils, moisture combined with dust becomes a medium for mold and bacterial growth. Therefore, regularly cleaning and disinfecting air conditioners and dehumidifiers not only improves your family’s health and prevents allergies but also maintains the performance of your air conditioners and dehumidifiers.

How often should air conditioners be cleaned? Residential and commercial frequencies differ greatly.

Residential Homes

  • Adjust cleaning frequency based on air conditioner usage habits: Daily use during summer: Professional cleaning once a year; Used 2–3 days per week: Clean every 1.5–2 years.
  • Environmental factors also affect frequency: Room air conditioners used for long periods, low-floor units near roads, or high-dust areas may need cleaning 2–3 times a year.
  • For homes with elderly, infants, allergy sufferers, pets, or high humidity, clean every 6 months.

Commercial Spaces

  • Offices: Due to extended use and high foot traffic, clean every 6–12 months.
  • Pet shops, restaurants, commercial venues, factories, or high-oil-smoke areas: These accumulate more fur, grease, and pollutants than standard businesses — professional cleaning every 3–6 months.

Air-Conditioner Service Process

Step – 1

Service Inquiry

Upon receiving your inquiry, our customer service officer will gather details on your air conditioner model, type, number of units to clean, and on-site conditions. We recommend providing photos of the units to help our professional team conduct an initial assessment and determine the cleaning needs.
Step – 2

Preliminary Quote and Service Plan

We will provide a clear quote and customized service plan based on the unit type, contamination level, and number of units. This includes detailed steps, scope of work, estimated time, and materials used.
Step – 3

Professional Cleaning

Our expert team arrives on schedule, using eco-friendly, non-toxic cleaning agents and professional equipment. Cleaning typically takes 1–2 hours per unit, depending on quantity and complexity.
Step – 4

Customer Inspection

After completion, you can inspect the results on-site to confirm the air conditioner is thoroughly clean and performing optimally. We’ll provide startup reminders, maintenance tips, and welcome your immediate feedback to help us continuously improve our service.

Note:

The process may be adjusted based on scope, difficulty, and time required. Contact our customer service officer anytime for an instant quote and booking.

Air-Conditioner Cleaning – Before and After

Johnson Group Air Conditioner Cleaning Before and AfterJohnson Group Air Conditioner Cleaning Before and After
Johnson Group Air Conditioner Cleaning Before and AfterJohnson Group Air Conditioner Cleaning Before and After
Johnson Group Air Conditioner Cleaning Before and AfterJohnson Group Air Conditioner Cleaning Before and After

Johnson Group Air Conditioner Cleaning Service Features


Johnson Group Other Brands
Hands-on experience


70 years of professional experience, mainly serving luxury homes and Grade A office buildings.


Experience varies; most are outsourced or part-time workers 

Service Model

On-site deep cleaning, sterilization, and disinfection — time-saving and convenient 

Some companies need to remove the air conditioner for cleaning 
Suitable for Sensitive Individuals

Designed for those with high hygiene requirements, children, pregnant women, and allergy sufferers

Cleaning Depth

7-step standardized process, thoroughly cleans evaporator coils and fan blades 

  Only surface cleaning, unable to reach the evaporator fins

Cleaning Technology


Hong Kong’s first cleaning company to adopt high-temperature steam technology for complete sterilization and mold removal 


High-pressure water cleaning may damage internal components 
Cleaning Materials

Australian AerisGuard™ pH-neutral enzyme solution that won’t damage metal surfaces 

Strong acidic or alkaline cleaners can corrode evaporator fins and cause rust 
Mold Protection

U.S. EPA-certified antimicrobial coating on evaporator coils, effective for 12 months 

No mold prevention treatment; mold and odor continue to grow 
Natural Cleaning Agent
Non-toxic, non-corrosive, 99.99% sterilization rate 

Chemical residue and metal oxidation leading to rust 
Drip Water Handling

Professional tools used on-site to unclog drain pipes immediately 

No service or extra charge required
Environmental Protection

Protective film is placed throughout the area to prevent contamination of furniture and floors 

Lack of protection measures may cause secondary pollution

Air Conditioner Cleaning Pricing

Why do air conditioner cleaning prices vary so much?

The cost of air conditioner cleaning depends on the type and number of units. Beyond price, professionalism, cleaning agents, and service scope are equally important. Low-cost options ($300–$500) often mean only surface-level cleaning or the use of cheap, harsh chemicals, while premium services include thorough internal cleaning, non-toxic solutions, high-temperature sterilization, and anti-mold maintenance.

A high-quality cleaning service is absolutely worth the expense. We clearly outline what’s included and not included, so you can compare options using the same transparent standard. Contact Our Customer Service here To learn more.

Air conditioner cleaning is a preventive health investment

Regular cleaning is not just a maintenance cost — it’s a preventive health investment that pays itself off over time. A properly cleaned air conditioner can reduce energy consumption by 10–30% and prevent costly repairs or replacement expenses. Delaying cleaning to save money can directly lower indoor air quality and negatively impact your health.

Air-Conditioner Cleaning Service FAQs

Typically 1–3 hours per unit, depending on the type, condition, and number of units. Our team will provide an estimated duration before the service.

Air conditioner dripping is primarily caused by drain holes clogged with dirt and grime. In most cases, we can resolve it through professional cleaning and clearing of the drain pipe (excluding blockages in the building’s main drainage pipes).

Every 6–12 months. In humid environments or with heavy usage, cleaning should be done more frequently.

Learn More: Air Conditioner Cleaning Guide|How Often Should You Clean It? Full Steps and Complete Maintenance Tips

Yes. We quote per unit with full itemization of procedures and materials — no hidden fees.

Please secure valuables and fragile items, and ensure stable water and electricity supply. A preparation checklist will be provided prior to the visit.

All materials are internationally certified, non-toxic, non-corrosive, and safe for children, pets, and the environment. They effectively eliminate 99.9% of bacteria and viruses.

The service covers only internal components (cover, filters, coils, fan). Effectiveness may vary with time and usage conditions.

Clients can inspect results on-site. Airflow readings are taken before and after cleaning for quality assurance. If issues are found within 48 hours, our team will arrange a follow-up check.

Other Home Cleaning Services

Schedule an Air-Conditioner Cleaning Service

Thank you for your interest in Johnson Group, please fill out the form below or email us at
[email protected] and we will get back to you as soon as possible.


     

     

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