[tzs]

This report [1] suggests that HRVs only actually have a net energy savings in the US in climate zones 4-8 (and such a small amount in zone 4 that it would take several decades to break even).

Is there a good reason to get them if one is in a place where they won't save energy?

Here's a US climate zone map [2].

[1] https://www.osti.gov/biblio/1488935

[2] https://basc.pnnl.gov/images/iecc-climate-zone-map