Clark and Floyd County clicks are only worth buying if you can cross the river to serve them
Geography is the first decision in a Louisville HVAC account and the one most likely to be quietly wrong.
A mileage radius from a shop in the Highlands reaches New Albany and Jeffersonville without noticing it crossed a state line. Registration, licensing and tax treatment differ between Kentucky and Indiana, so confirm your standing with the relevant state agency and your own counsel before you spend a dollar over there.
If you are licensed only on the Kentucky side, exclude the Indiana side properly. Not a bid adjustment, an exclusion. Buying clicks you cannot invoice is the most expensive habit in local paid search, and it hides inside a radius setting where nobody looks.
If you do serve both, run them as separate campaigns with separate budgets. Cost per booked job almost always differs across the river, and a merged campaign averages the two into a number that tells you nothing.
Inside Kentucky, keep going. Louisville Metro and Jefferson County are one merged government, while Oldham and Bullitt are separate counties with their own buyer mix. Separate them in the account so the reporting can separate them too.
Local Services Ads are worth pursuing alongside search, and the verification paperwork is state specific. Sort out which entity is verified where before you assume the ads will show on both sides.