If its a repair that I've requested, then I'm happy to give a bit a leeway for notice as to when the tradie is coming.
For example when I moved in, two of the external doors were unlocked and no keys could be found for them. I was more than happy for minimal notice as to when the locksmith was coming, as long as he freaking came!!!
But something like an aircon quote? Nopes - book the aircon guy for next week and then send the required entry notice.