Where to Find and Catch Heatmor
From Pokemon Go Wiki
Heatmor are found and captured in Nest and Habitat locations.
Nests
Heatmor Nests are locations that consistently spawn Heatmor.
Habitats
Heatmor Habitats are spawn locations where Heatmor is likely to be encountered, but not guaranteed the way a Nest is.
Additional Tips and Information
Best Nests
If you know a really good nest or any of the nests above is really good, list them here: