I researched duct cleaners recently and found a similar set of dubious businesses. There are several businesses named "American Air Duct Cleaning of [insert city name]". Google Maps has 70-120 5 star reviews. They all say things like “David and Oscar did a great job”…. from Florida to Texas to other states... always David and/or Oscar for each place! All the reviews are in the last 6 months or so. All the reviews are relatively unique and the reviewers are not new Google reviewers… there’s definitely some sort of weird Google Review scam going on here. All the websites say “Family/Locally Owned & Operated" yet they're identical web pages.

I'm surprised by how unsophisticated the approach appears. Interesting to see the problem is not limited to duct cleaning businesses.