Half Map page can only work with header google maps.

If you have global header set to Google Maps, this will be used by default for the pages with the Half Map template (Properties list Half, Advanced Search results Half,  Property Category/Taxonomy page Half).

For taxonomy page with half map option, global Media Header Type must be selected for Google Maps as there is no custom option to change header type per category.

For Properties List Half and Advanced search results half you can edit the page and set custom header to Google Maps: