Hong Kong HVAC & Ventilation Specialists · Since 1974
ENGINEERED.The engineering strength big clients trust
Long-term contractor to MTR and AsiaWorld-Expo. From commercial ventilation to home air conditioning — one team, end to end.
Trusted By
Two decades of delivered projects for Hong Kong's major institutions
From MTR stations to AsiaWorld-Expo halls, every project gets a dedicated project manager — meticulous from tender to handover.
What We Do
From commercial E&M to home air conditioning, Hang Sing covers it all
Half a Century of Craft
Founder Mr. Lui Kai Sing entered the trade in 1974 and started his first engineering firm in 1981. Hang Sing Engineer Company Limited was incorporated in 2007, and since 2015 the second generation has expanded the business into central HVAC systems and long-term partnerships with MTR, AsiaWorld-Expo and more.
Read the Hang Sing storyWhy Hang Sing?
Institution-grade workmanship
The same safety and acceptance standards we run on MTR and Jockey Club sites, applied to every client.
A dedicated project manager
One person owns your job from quotation through works to after-care.
Fully licensed team
Every worker holds a valid safety card and registration; many hold MTR-approved licences (RSI, CPNT, FM).
Transparent pricing
Free quotations, clear itemised prices, no hidden charges.
Common Questions
It depends on the unit type and horsepower — split and window units are priced differently. WhatsApp us your unit type, horsepower and district for an exact price. Our pricing is fixed: no top-ups on site.
Once a year for typical home use; twice a year if you have pets, live near a main road, or run the unit long hours. Regular cleaning saves electricity, cools better, removes odours and extends the unit's life.
Usually within 3–7 days of confirming the quote. In peak season (May–August) book early. Tell us if it's urgent and we'll do our best.
Put your project in trusted hands
Free quotation · Dedicated follow-up · Reply within one working day
In the trade since 1974·MTR-Approved Contractor Credentials·Registered Minor Works Contractor