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!"
Based in Cooranbong, Lilac Air Conditioning is your local HVAC expert for the Lake Macquarie hinterland and surrounding areas.

Cooranbong is where Lilac Air Conditioning is based, and it's where Gary Lui lives. That makes this the suburb where he can usually get to you quickest.
The Lake Macquarie hinterland is a different climate from the coast. Summer is hot, winter mornings are cooler than the beaches, and the swing between the two is wider. A reverse-cycle system doing both jobs is a sensible way to heat and cool the same space, but only if it's the right size.
Sizing is the real issue here. Many Cooranbong properties are semi-rural, with big floor areas, high ceilings, extensions that were added over the years, and sometimes a granny flat or studio out the back. A system chosen from a catalogue for a standard lounge room won't cope. Gary takes proper measurements, looks at the insulation and the sun, and plans the layout room by room.
Lilac Air Conditioning also covers Martinsville and the surrounding hinterland. If you're thinking about a system, Lilac Air Conditioning offers a free on-site assessment and puts a fixed price in writing. Gary will happily talk through ducted, multi-head and single split options, including how each behaves in winter, and he'll be upfront if a smaller system would suit your house better than the one you had in mind. Servicing and repairs are available on the same basis.
Local Climate Note
Out in the hinterland Cooranbong swings harder between hot summer afternoons and cool winter mornings than the coast does.
Acreage homes often have long hallways, mixed ceiling heights and rooms added at different times. Gary looks at each zone separately, because one big unit in the middle rarely suits a spread-out floor plan. The result might be ducted with zones, or several splits, depending on the layout.
Being home base means short travel for quotes, repairs and service visits, and it's the one place where Lilac Air Conditioning can say response is quickest. It also means the person who installs your system lives nearby, so if you need a hand later, he's easy to reach.
Residential Installations
Split systems and ducted AC installed right, first time.
Commercial HVAC
Minimal disruption. Maximum comfort. For your business.
Repairs & Breakdowns
AC broken on a 40-degree day? We show up.
Routine Maintenance
Keep your system running efficiently all year round.
VRF/VRV Systems
Multi-zone climate control for complex buildings.
Ventilation Solutions
Fresh air, compliance, and comfort — all covered.
In addition to Cooranbong, we service the following nearby suburbs. If your suburb isn't listed, call Gary — we cover a wide area.
Free, fixed-price quote. No obligation. Gary responds within a few hours.
AC Breakdown in Cooranbong?
Call Gary directly for same-day emergency response.
Call Now: 0401 764 917
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!"
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!"
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"
Heidi Iveson
February 2025
"Not expecting our air conditioning to stop on one of the hottest days of the year, I contacted Gary and he advised me straight away his availability and turned up to review our situation. Unable to source spare parts for our older unit, Gary was up front and honest in quoting, supply and installation. I would highly recommend Gary for his experience, knowledge and thorough communication. Thanks Gary"
Takes less than 60 seconds — and it means the world to a small local business.