The unit installed is not what was discussed - I’d asked for a quiet system because I work from home. The unit installed is so noisy you can feel it in the floor and walls and across half the house.

The quote was very vague and Marty was not keen to give details. When I eventually got a model number out of him, it turned out that his quote was $900 for what in the worst case is $500 worth of kit (a $300 fan plus some tubing and 3 vents) plus $400 for installation. He did less than four hours work.
There was also an unspecified $110 for materials and consumables.
Basically, I got charged $1500 for $500 of equipment, and that wasn’t what was discussed.
I’ve asked several times for a breakdown of the costs, but Marty would never give me any more detail than the original quote.
He did however call me a bully for asking for this detail and spouted paranoid fantasies about the government.
I found Marty quite charismatic, but since then have found that either he thinks I’m an idiot and only took advantage of me, or charges a ridiculous mark up on all his jobs.
Don’t be fooled by his smooth presentation, in my opinion he is not worth the obscene mark up, or the insults when he fails to deliver on what was agreed to.
Look around for someone calm, credible and trustworthy, and who will be transparent about prices. In my opinion, that is not Marty from mould tas or healthy homes tas.

Approximate cost: $1500