The theme offers support for  energy class certificate details (needed in Europe market)

Demo url –

Admin settings for Energy Certificate

Add this info only if you wish to show this in property page

Front end submission options for Energy Certificate

If you wish to show these fields in front end submission form for listings, you must first select the fields to show in submit form

And users will fill in the info

Add Energy Class certificate in Custom property template

Please see this help for how to add Energy Class Certificate in Custom property template