Most HVAC marketing advice is a list of forty tactics. You need six: the Google listing, emergency and replacement pages, town pages, reviews, follow up, and one number to watch.

Search for HVAC marketing ideas and you get lists of forty tactics: start a podcast, sponsor a little league team, try TikTok. Some of that is fine, but none of it is what makes the phone ring in the first week of a heat wave.
Here is the short list that does, roughly in order of how fast it pays off.
The map pack takes the no heat and no cooling calls, and your Google Business Profile decides whether you're in it. Set the primary category to the service you most want to be called for, match the service area to where you send trucks, add photos from real installs, and list every service. Most HVAC listings were set up years ago and never touched again. An afternoon spent here does more than a month of social media posts.
A dead furnace at midnight and a system replacement shopped for two months are different customers, and they need different pages. The emergency page is for someone who isn't reading: phone number, service area, and nothing else in the way. The replacement page is for someone comparing financing, efficiency ratings and warranties. One page trying to do both jobs does neither well.
Google answers from where the searcher is standing. You can rank first at your shop and not appear at all three towns over, which is why we measure with a rank grid instead of a single search. The fix is a real page for each town you want work in. We wrote about the grid effect here.
Send a request after every service call, as a text with a direct link. Both the number of reviews and how recent they are count, and a steady flow beats an occasional burst.
Half your calls come in while your techs are in attics and crawl spaces. A missed call that gets a text back within seconds usually stays with you. A missed call that rings out goes to the next name on the list.
Impressions and clicks don't tell you much. The number to watch is where you rank, town by town, and how many calls and form fills came in. If a tactic doesn't move that number, drop it.
Google Ads can work as a faster layer on top of this, especially in peak season. As a replacement for it, ads only work as long as you keep paying, because the calls stop the day the spending stops. Build the organic base first, then add ads where the math works.
The whole system above is what we build and run for HVAC companies. The full guide, including what it costs, is on our HVAC SEO page. You can also start with the free audit and see where you rank in every town you serve.
Start with a free audit of your site and your Google listing. It costs nothing and you aren't signing up for anything.