Yes.  This has nothing to do with location.  As long as you can make the listings, and submit to the white label portal. You will get paid.
None.  There is no need to cold call. There is no need to negotiate or anything.  All you are doing is posting HVAC (ac etc) gigs on various sites and using our tool to send people over.
In the US and most of the places.  When a ac guy goes over to check in on the problem. They charge a FIXED fee for just coming over and taking a look.   That means that even if people don’t use the service, YOU will get 50% cut!
No.   You will not spend a penny besides investing in this platform.