Ventilation & air conditioning

Ventilation and air conditioning in Hong Kong

Updated 4 November 2026

In Hong Kong a 1 HP inverter split unit is listed from about HK$2,790, top-listed brands run from HK$3,674 to HK$5,946, and installation is HK$380 to HK$680 per unit. The quickest way to a price for your flat is a request on BlaBlaPrice, where sellers reply with their own offer.

Rules and the MW05 form

A standard installation, as listed in local price lists, includes submitting the Certificate of Completion of Minor Works, form MW05, under the simplified requirements for minor works. Ask for it in writing with the quote. Mechanical ventilating systems with air handling capacity exceeding 1 cubic metre need a ventilation or air-conditioning control system under the fire services rules, so check this for any larger system. The government's General Specification for air-conditioning, refrigeration and ventilation sets the standard for materials and workmanship, and you can ask the installer to follow it.

Season: the summer peak

Summer runs from June to August, and that is when demand for air conditioners peaks. Winter, from December to February, is the quiet time for cooling work. November sits between the two, so a booking now is usually done before the summer rush.

How it is bought and quoted here

Prices are per unit in HK$, with the size given in horsepower: 3/4 HP, 1 HP, 1.5 HP, 2 HP and 2.5 to 3 HP are the sizes in installation lists. Room area is in square metres, so write the floor area in m² and the wall or window where the unit will go. Name your district among Central, Kowloon, Sha Tin, Tsuen Wan or Tuen Mun so that sellers near you reply.

What to write in your request

Say whether you need a new unit, a replacement or a repair, and whether you want a split or a window type. Add the size in HP, the quantity, the room area in m², the installation conditions (such as an existing pipe hole or a bracket on the outer wall), the building address, your deadline and your budget.

On BlaBlaPrice you describe the job in your own words in a chat, and a photo can be added. The AI asks for missing details, looks through sellers' websites and price lists in Hong Kong, and shows the prices and businesses it found. Registered sellers receive the request and reply in the chat with their own price, terms and delivery. Your contacts stay hidden until you decide to exchange them. Start from the request field on the home page or read how BlaBlaPrice works.