Gosford Dental Centre
June 2025
"We highly recommend Lilac HVAC. They were able to fix 3 previously installed units that were incorrectly linked at our business premises. Very professional service and knowledgeable."
Google review
Rooftop and slab-mounted units
Package air conditioning units on the Central Coast
A package unit puts the whole system in one cabinet, on the roof or a slab outside. Lilac Air Conditioning supplies, installs, replaces, repairs and maintains them for shops, offices, medical suites, clubs and light industrial sites around the Central Coast and Lake Macquarie.
Lic: 469578CRTA: AU068433Fixed-price quotesAuthorised Hitachi & Temperzone installer
What a package unit is
A packaged air conditioning unit is a self-contained system. The compressor, coil, fans and controls all sit in one weatherproof cabinet, mounted on the roof or on a slab beside the building, and the cooled or heated air travels to the space through ducting.
Lilac Air Conditioning works on package units for shops, offices, medical suites, clubs and light industrial buildings, and Gary Lui handles both the install and the later servicing. Because there's no separate indoor plant, they're popular where floor space is tight.
Who this suits, and who it doesn't
Package units make sense when a business has one main open space to condition, or a building that's already set up for one and just needs the old unit replaced. They're less happy where every office needs its own temperature.
- A good fit: a single tenancy with open floor space, an existing roof or slab position, and ductwork already in place or easy to run.
- Worth a second look: several small rooms that need individual control, where split systems or VRF can give each room its own setting.
- Needs checking first: roof strength, access for lifting equipment, noise near neighbours, and whether the electrical supply suits a replacement of a different size.
A like-for-like changeover, in order
Swapping a tired package unit for a new one sounds simple, and often is. This is the usual order of work, and Gary confirms the details for your site in the quote.
- Gary inspects the existing unit, its mounting frame or curb, the duct connections and the electrical supply.
- Gary checks the existing unit's size against how the space is used today, because a like-for-like swap isn't always the right size any more.
- You get a written fixed-price quote that names the new unit, what's being reused, and what's being replaced.
- The changeover is booked for a time that suits your trading hours.
- The old unit comes out, the new one is set, ducts and electrics are reconnected, and the system is run and tested before Gary leaves.
Keeping downtime short
Nobody can promise a changeover with no interruption, and Lilac Air Conditioning won't pretend otherwise. What helps is planning. Access and lifting arrangements are agreed ahead of time, and the work is booked for after hours or a weekend where the site allows it.
The quote spells out the expected timing, so you can tell staff and customers what to expect. If something unexpected turns up on the roof, he talks to you before doing anything extra.
Repairs and maintenance on packaged plant
Package units sit outdoors and work hard. Filters clog, coils pick up dirt and salt, fan motors and belts wear, and condensate drains block. Lilac Air Conditioning repairs package units of the major brands, including ones it didn't install, and aims to respond to breakdowns the same day. A hot shop with the doors open doesn't wait well.
Planned maintenance catches most of these problems early. A visit covers filters, coils, fans, drains, electrical connections and controls, and Gary tells you what he finds. Gary can suggest a maintenance schedule that suits how hard your unit works.
Get a fixed-price quote
Free on-site assessment. No obligation. Gary replies within a few hours on business days.
NSW Contractor Licence 469578C. Serving the Central Coast and Lake Macquarie from Cooranbong.
Questions answered
Package units: common questions
A split system has an indoor unit and a separate outdoor unit joined by refrigerant pipes. A package unit keeps everything in one cabinet outside and sends air indoors through ducting. Package units suit open commercial spaces. Split systems suit rooms that each need their own control.
It depends on access, the condition of the ductwork, and the electrical supply, so Lilac Air Conditioning won't quote a time without seeing the site. Gary looks at the existing unit at the free assessment and puts the expected timing in the written fixed-price quote.
Yes. The brand on the old unit doesn't matter. Gary checks the mounting, duct connections and electrical supply, then recommends a replacement that suits the space as it's used today. He'll also tell you if the old unit still has useful life and a repair makes more sense.
It varies with the site. A unit over a busy kitchen-adjacent shop works harder than one on a quiet office. Gary looks at how yours is used, then suggests a schedule that fits. A check before the hot months is a sensible starting point.
Lilac Air Conditioning is an authorised Hitachi and Temperzone installer and can quote from either where a suitable model exists for your site. Gary also installs other major brands, and he'll say plainly which unit suits the job rather than defaulting to one name.
Google Reviews
What Lilac Air Conditioning clients say
Lilac Air Conditioning has a 5.0 average from 50 Google reviews, and every one of them is five stars. Here are some, in the reviewers' own words.
Michelle MacKnight
March 2026
"Thanks Gary and your Apprentice for installing my new split system air conditioner. I appreciate your friendliness, punctuality, and job quality. I am very happy with my new system!"
Google review
Perfectionist Detailing
February 2026
"From start to finish, Gary was a pleasure to deal with when we needed an additional outlet installed to our ducted aircon system. He is a highly knowledgeable professional who takes pride in his work and the service he delivers to customers. Thank you Gary!"
Google review
Brett Ashman-Steel
January 2026
"Gary came highly recommended by another business. We discussed the problem we were having with my partners business and he provided a quick and affordable quote. Within days the problem was rectified. Very friendly and professional service. Would certainly recommend Lilac HVAC. Thanks Gary"
Google review
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Where Lilac Air Conditioning works
From Cooranbong, Gary Lui covers the Central Coast and Lake Macquarie.