The typical HVAC lead in Australia comes from a directory listing, a marketplace, or a shared form that sends the same homeowner's details to every air con company in a 50km radius. The homeowner didn't choose you. They clicked a button and now four businesses are racing to call them first.
Half the time the enquiry is vague - "need air conditioning" with no detail on property size, system type, or whether they're looking for a $2,000 split system or a $15,000 ducted install. You're quoting blind against competitors who are doing the same thing, and the homeowner is picking whoever answers cheapest.
That's not a lead generation strategy. That's a race to the bottom with no control over what walks through the door.