How quickly can they respond to a broken aircon?

Reviews mention same-day emergency repair completion and next-day follow-up visits for any post-service issues.

Do they clean up after the job?

Yes. Multiple reviewers note technicians left no mess behind and cleaned up thoroughly, including after leak repairs.

What does servicing cost?

Their website lists $28 plus 9% GST as a promo price for one unit. No hidden charges mentioned in reviews.

Koomax Engineering Pte Ltd

Updated 2026-08-11 · 2,604 reviewed · 600 listed · Scored from 28 Google reviews · How we rank ›

5.0(28) 83 composite score See reviews on Google ✓ Google-verified Publishes prices

Aircon InstallationAircon Servicing & RepairAircon Maintenance Contracts24/7 Emergency Aircon RepairGas Top-Up & Chemical Cleaning

Services: Aircon Installation, Aircon Servicing & Repair, Aircon Maintenance Contracts
Reviews: 28

What recent reviews say

Koomax handles routine servicing and emergency repairs across Singapore with consistently punctual technicians and rapid response times. The team backs up their work by returning the next day if minor issues arise, and reviewers praise both the technical skill and the courteous cleanup left behind.

Praised for

responsive customer service (WhatsApp, admin team)
same-day or next-day fixes on issues
professional technicians (William, Francis noted by name)
clean workmanship with tidy site
fair and transparent pricing
reliable after-sales support

punctualresponsivefair-pricingskilled-techniciansreliable-warrantyclean-workmanshipquick-responsetidy-installationhonest-quotesprofessional-servicegood-after-sales-support

Best for: households and small offices needing reliable ongoing servicing with swift response to emergencies

Strengths

same-day emergency repairs
next-day follow-up for post-service issues
named technicians known for professionalism (William, Francis)
responsive admin team on WhatsApp

Worth knowing

Technicians William and Francis repeatedly praised by name for punctuality and professionalism
Customer service staff Alice noted for clear communication and responsiveness
Completed emergency repair and same-day callout within hours
Promo price $28 plus 9% GST for single-unit service (as of year-ago review)
Typical servicing on 3 units completed in 50 minutes
Follow-up visit arranged next day for post-service issues at no extra charge mentioned

What reviews say by service

Aircon Servicing & Repair: Reviewers consistently praise thorough cleaning, fast turnaround, and same-day emergency response
24/7 Emergency Aircon Repair: Same-day repair completion noted, technician arrived on time and fixed issue on first attempt
Gas Top-Up & Chemical Cleaning: Customers pleased with professional cleaning service and leak detection; air units blow significantly colder after service

How it compares

Rated 5 against a 4.47 average across the 417 aircon installation businesses listed here.
Has more Google reviews than 65% of the businesses in this directory.

How we scored this

How We Rank

Star rating 84

Review volume 63

Review recency 100

Review sentiment 82

Profile completeness 100

Verification 30

Rating breakdown

Common questions

How quickly can they respond to a broken aircon?: Reviews mention same-day emergency repair completion and next-day follow-up visits for any post-service issues.
Do they clean up after the job?: Yes. Multiple reviewers note technicians left no mess behind and cleaned up thoroughly, including after leak repairs.
What does servicing cost?: Their website lists $28 plus 9% GST as a promo price for one unit. No hidden charges mentioned in reviews.

Contact

Phone: +6562300218
Website: http://koomax.com.sg/
Address: 28 Sin Ming Dr, #01-153, Singapore 575702
Open in Google Maps

Last verified 2026-08-11

Opening hours

Monday: 09:00-18:00
Tuesday: 09:00-18:00
Wednesday: 09:00-18:00
Thursday: 09:00-18:00
Friday: 09:00-18:00
Saturday: 09:00-13:00
Sunday: Closed

As listed on Google.

From their website

Services listed

Aircon ServiceAircon RepairAircon InstallationTroubleshooting of air-conditioning systemsVRV/VRF air-conditioning systemsAir leak pressure testingPCB ReplacementGeneral Cleaning

Published prices

Aircon Service (1 unit): $28 plus 9% GST (promo price)

Operating:more than 18 years

As published by the business on its own website; not independently verified.

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