Most Most [HVAC contractors](/resources/hvac-contractor) aren't losing Google rankings because SEO is hard who are losing ground on Google aren't doing anything obviously wrong. Their website loads, their number is listed, they have a Google Business Profile. The problem is that SEO mistakes at this level are errors of omission and misconfiguration — not outright failures.
Google ranks HVAC companies based on three broad signals: relevance (does your content match what the searcher needs?), proximity (are you geographically appropriate?), and authority (do other credible sources reference you?). When any one of these signals is weak, your rankings suffer — even if the other two are fine.
The compounding problem is that these mistakes rarely announce themselves. You won't get an email from Google saying your citation data is inconsistent or your service pages are too thin. You just gradually rank lower while a competitor with slightly fewer mistakes pulls ahead.
The seven mistakes below are the ones we see most consistently across HVAC companies that come to us after months of stagnant or declining organic traffic. They're ordered from the broadest (strategic errors) to the most technical (implementation errors), because fixing strategy first makes every technical fix more effective.