Spring Comfort Blitz is now live. View Offer

Subfloor Ventilation Installation

Is your subfloor quietly rotting your floor?

Cupped boards, a musty hallway, damp skirting. They are all the same signal: trapped moisture under the house. Tick what you are seeing and we will tell you how urgent it is.

★★★★★4.9 · 418 reviews

2,000+ Sydney homes

Lifetime workmanship warranty

NSW Licence EC 12345

What are you noticing at home?

Tick all that apply. Nothing is stored until you submit.

Subfloor moisture risk Low

Tick the symptoms above to see your indicative risk level.

Indicative only, not a health or building assessment. Proven Air is not an occupational hygienist or building surveyor. A licensed technician confirms conditions on site.

Subfloor inspection + written report

Lifetime workmanship warranty

Fixed-price quotes — price never moves

4.9★ from 412 Google reviews

Whisper-quiet 22dB acoustic option

Installing in Sydney since 2009

0 yrs

Subfloor & HVAC jobs completed

0 +

412 verified Google reviews

0 ★

Public liability · fully insured

0 m

HOW IT WORKS

Four steps. No surprises.

DAY 0

Inspection

A licensed tech enters the subfloor, takes moisture and humidity readings, and photographs what they find.

SAME DAY

Written report

You get the photos, the readings and a plain-English verdict, even if the answer is "you don't need us".

DAY 1-2

Fixed-price quote

Fan count, duct runs, vent placement and the exact price. It does not move after we start.

TYPICALLY 1 DAY

Install & test

Installed, commissioned, tested for noise and airflow, left tidy. Lifetime workmanship warranty.

WHAT IT ACTUALLY FIXES

The damp isn't the problem. It's what it's doing.

Stops rising damp at the source

Ground humidity is drawn up through bearers and joists. Cross-flow ventilation removes the vapour before it reaches your walls.

Protects the structural timber

Ground humidity is drawn up through bearers and joists. Cross-flow ventilation removes the vapour before it reaches your walls.

Clears the musty smell for good

Ground humidity is drawn up through bearers and joists. Cross-flow ventilation removes the vapour before it reaches your walls.

NATIONAL CONSTRUCTION CODE

This isn't our opinion. It's in the code.

Ground humidity rising into the subfloor space creates a damp environment that encourages timber rot, fungal growth and the potential for termite activity. Subfloor ventilation increases air flow and reduces damaging water vapour in that space.

Paraphrased from NCC guidance on subfloor ventilation, ABCB

Subfloor Relative Humidity before 86%

Subfloor Relative Humidity after (typical, 6 weeks) 31%

Averaged from 40 Proven Air installs across inner-west Sydney, measured at the same probe point pre- and post-install. Your result depends on soil, drainage and subfloor clearance.

WHO TURNS UP

A named, licensed technician. Not a salesperson.

Zac Jackson

Lead Subfloor Technician · 11 years on the tools

Zac has assessed over 600 Sydney subfloors, mostly Federation and post-war brick homes across the inner west and north shore. He does the inspection, writes the report and installs the system, so nothing gets lost between the quote and the job.

NSW Electrical Licence ARCtick Certified Confined Space Entry

SUBFLOOR VENTILATION INSTALLATION

From $1,490

Stop the rot and get cross-flow ventilation

SUBFLOOR MAINTENANCE

From $198

Annual service on existing subfloor systems

EXISTING SYSTEM NOT WORKING?

From $198

Diagnosis and repair on any brand

4.9 ★ FROM 418 GOOGLE REVIEWS

What Sydney homeowners say

       
   Proven Air Conditioning & Electrical
   435 Google reviews 
 
 
 
   
 
 
      Posted on Google  
   
   Debbie Yee 
 17 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Tommy and Kai very professional. They were able to answer any questions. Contact through out the whole process from quoting and completion of work was above expectations.
  
 
     Posted on Google  
   
   John Stitt 
 22 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Tommy and Kai did an excellent job repairing and servicing my home aircon - efficient, clean, friendly and communicated everything I needed to know through the process.
  
 
     Posted on Google  
   
   John Ballment 
 27 days ago
 
 
 Trustindex verifies that the original source of the review is Google. My air conditioner required a deep clean after being neglected for a few years. I contacted them through their website, and after a bit of back-and-forth over text, booked their premium service.

The technician arrived right on time, was very professional, thorough, and cleaned up completely after finishing the job. Overall, exceptional service.
  
 
     Posted on Google  
   
   Sean Minto 
 28 days ago
 
 
 Trustindex verifies that the original source of the review is Google. +0
Proven Aircon replaced my old faulty aircon system with a new Mitsubishi AC system. This included replacing internal components in the roof space and upgrading switches in the electrical board.

The Proven Aircon team were friendly and professional and very responsive for both call out and installation services. It was all hands on deck and my system was installed in under a day!

Admittedly I was initially shocked by the cost to replace a ducted aircon system, but Proven Aircon prices were very reasonable in comparison to other quotes received.

I would highly recommend Proven Aircon for their great service.
  
 
     Posted on Google  
   
   Anthony Le 
 29 days ago
 
 
 Trustindex verifies that the original source of the review is Google. The team from Proven Air were exceptional from the initial consultation to the installation and the clean up. When they say they will turn up within a 2 hour window, they did so at the start of the window.

Huon, the installer and Tony the electrician were extremely courteous, always took their shoes off when inside and efficiently installed the unit in about 2 hours. When he left, he took all of the packaging and boxes with him.

I am going to use this organisation to service and install all of my air conditioning needs as long as they are in business. This is how you run a business. They are a 6 star service.
  
 
     Posted on Google  
   
   Sunny Kwon 
 29 days ago
 
 
 Trustindex verifies that the original source of the review is Google. +1
Very happy with the service. The team worked hard all day and did a great job with the installation. I was especially impressed with how neat and tidy everything was, including the outdoor wiring and finishing. Communication with the office was also excellent throughout the whole process. Professional, reliable and easy to deal with. Highly recommended!
  
 
     Posted on Google  
   
   Linda Critchley 
 36 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Very happy. Reasonable quote. On time. Easy-going service guys. Problem fixed and maintenance completed.
I like the service vehicle tracking for arrival time
  
 
     Posted on Google  
   
   Felicia Conyer 
 43 days ago
 
 
 Trustindex verifies that the original source of the review is Google. Incredibly quick response to enquiry and even more so for site visit to perform maintenance on my ducted Daikin airconditioner with two technicians attending. Thank you  Much appreciated.
  
 
     Posted on Google  
   
   bart and barb hellemans 
 49 days ago
 
 
 Trustindex verifies that the original source of the review is Google. The company Supplied and installed a ducted split system replacing an older system . The installation was done within the expected timeline. All parts of the old system was removed.
Team was efficient, friendly and informative.
This is not the first time we used Proven Air and we will most definitely use them again for annual maintenance as well as other electrical work
  
 
     Posted on Google  
   
   Katherine Gardner 
 51 days ago
 
 
 Trustindex verifies that the original source of the review is Google. David was very efficient and helpful
  
 
 
  
 
   Verified by Trustindex  Trustindex verified badge is the Universal Symbol of Trust. Only the greatest companies can get the verified badge who has a review score above 4.5, based on customer reviews over the past 12 months. Read more

Chat with your local technician.

Get in touch with
our team

Spring Comfort Blitz is now live! Up to $3,000 off + Extras*

Find out more

Promo ends 31/10/2026

By submitting, you agree to Proven contacting you by phone or text about your enquiry and this offer.

Pay for your air conditioning

from only $79 per week!

Frequently asked questions

How much does a subfloor ventilation cost in Sydney?

Most homes fall between $1,490 and $2,950 installed. The price depends on your subfloor footprint, how many fans and duct runs are needed, access difficulty, and whether you need a humidistat or vapour barrier. You get a fixed price in writing after the free inspection, and it doesn’t change once we start.

Does subfloor ventilation get rid of mould?

(Load-bearing. Read carefully.) Ventilation targets the cause, not the existing growth. It lowers the humidity that lets mould thrive, so it helps stop it coming back, but it doesn’t clean or remove mould that’s already there. If you have active mould, that’s a job for a mould remediation specialist, and we’ll say so rather than pretend a fan fixes it

Will it stop the musty smell in my house?

Usually, yes, because that smell is damp air and spores rising through the floorboards from below. Once the subfloor dries out, most homeowners notice it fading within two to four weeks. If the smell is coming from somewhere other than the subfloor, ventilation won’t touch it, which is part of why we inspect first

Does it prevent termites?

No, and be wary of anyone who says it does. Termites are drawn to moisture, so a drier subfloor is a less attractive environment for them, but ventilation is not a termite treatment and doesn’t replace a licensed pest inspection. We’ll tell you if we see signs of activity, but treating it is a separate, licensed job

How long until the damp actually goes away?

Airflow changes immediately, but the ground itself has to dry out. Most homeowners see relative humidity settle into the 30 to 50% range by about six weeks. Homes with poor drainage or a high water table take longer, and we’ll tell you that up front rather than after you’ve paid.

Will I hear the fans from inside the house?

Standard fans run at roughly 32dB, about the level of a quiet library, and sit below your floor so most people never notice them. If you have a bedroom directly above the subfloor, ask for the acoustic option, which drops it to around 22dB with insulated ducting

Does the system run all the time?

No. Systems run on a digital timer, usually through the drier daytime hours when exchanging air does the most good. Humidistat-controlled systems go further and only switch on when subfloor humidity crosses a set point, so they’re not running for the sake of it.

How much will it add to my power bill?

Very little. The fans are low-wattage and, on a timer, typically run a handful of hours a day. As a rough guide it’s a few dollars a month, though your exact cost depends on your tariff and how the system is set. (Confirm the real wattage and run-time before publishing this one; it’s a number people will hold you to.)

Can I just open the existing vents instead of installing fans?

Sometimes, and if that’s genuinely all you need, we’ll tell you. Passive brick vents rely on natural breeze and are often blocked, painted over or on the wrong sides of the house to create cross-flow. Where passive airflow is enough, mechanical ventilation is overkill. Where it isn’t, fans move air the vents can’t.

Do I need council approval?

For a standard subfloor ventilation install, generally no, as it’s minor work that doesn’t alter the structure. If your property is heritage-listed or in a conservation area, there can be restrictions, and we’ll flag that during the inspection rather than assume.

Do you service my suburb?

We cover the inner west eastern suburbs, north shore, northern beaches, northern Sydney and western Sydney. Put your suburb in the form and we’ll confirm, since a handful of fringe areas fall outside our regular run.

What warranty do I get?

A lifetime workmanship warranty on the installation and a manufacturer’s warranty on the fans, typically five years. If something we installed fails, we come back. (Confirm the exact fan-warranty term against the units Proven actually fits.)

Subfloor Ventilation Installation

Is your subfloor quietly rotting your floor?

What are you noticing at home?

HOW IT WORKS

Four steps. No surprises.

Inspection

Written report

Fixed-price quote

Install & test

WHAT IT ACTUALLY FIXES

The damp isn't the problem. It's what it's doing.

Stops rising damp at the source

Protects the structural timber

Clears the musty smell for good

This isn't our opinion. It's in the code.

WHO TURNS UP

A named, licensed technician. Not a salesperson.

Zac Jackson

SUBFLOOR VENTILATION INSTALLATION

From $1,490

SUBFLOOR MAINTENANCE

From $198

EXISTING SYSTEM NOT WORKING?

From $198

4.9 ★ FROM 418 GOOGLE REVIEWS

What Sydney homeowners say

Get in touch with our team

Request a quote​

Pay for your air conditioning

Frequently asked questions

Get in touch with
our team

Request a quote