Radiators are traditionally used in colder climates - but you would be surprised how many villa owners still use them. They are not very good at cooling but can still be connected to an electric heatpump - although the villa owner does have to take care to size them correctly for the lower heat generated.
The majority of our radiator installs are connected to traditional gas boilers where the capital cost of install is comparatively low - unless of course you view your radiators as an architectural feature - and then cost goes out the window!
It is sometimes beneficial to consider that cooling is an absolute necessity in the Algarve and air conditioners heat as well as cool far more efficiently - but if you must have radiators - we install them!!