The main way that HVAC dealers promote their services is that a well-serviced HVAC unit will make a big difference in your electric bill:
Of course, the drawback to this approach is that EVERYONE already does this.
This company did a nice job of making their spot personal. It’s a good way to make your potential client stand out from the clutter:
Here’s an example of selling the value of the experience and credentials of an HVAC company:
This is a spot for AC services, but is pretty humorous and could be an effective spot as we get closer to summer time: