[ThrustVectoring]

The AC advertisements are in case you're someone who regularly buys AC units and installs them, I think. DIY landlords, general contractors, etc.

Advertising platforms sell that ad with the maximum bid at auction, given what targeting categories they can place you in. Value of serving an ad is roughly customer lifetime value (LTV) times conversion rate (maybe divide by about three, but that doesn't change the winning ad). You don't have to be in a key target demographic to get oddly specific ads, you just need to get lumped into a similar cohort that has enough targets that are valuable enough.

Remember those random television ads from law offices about mesothelioma? Same concept. Pursuing a civil suit was lucrative enough that the trickle of leads you'd get from blasting everyone with that message was good enough. Doesn't matter if it's relevant to <1% of the target audience - high LTV can make up for it.