They aren't real common, but there do exist air-to-water heat pumps that can be used for radiant floors. They usually aren't hot enough for pre-existing baseb

They aren't real common, but there do exist air-to-water heat pumps that can be used for radiant floors. They usually aren't hot enough for pre-existing baseboard, but hydronic flooring runs cooler. Not sure about availability, but here are some specs from a Canadian manufacturer: https://www.arcticheatpumps.com/specifications.html https://www.arcticheatpumps.com/specifications.html.