Integrating a modern heating/cooling system within classical architecture requires more than just finding supply and return grilles that aren’t objectionable and hiding them around corners.
To maintain “modern” levels of comfort requires some planning. The Air Distribution System must properly yet unnoticeably mix air into rooms, or the home has the potential to feel and smell rather “old world,” too.
And of course, there is the wine cellar: beautiful, 55 degrees and 70% RH with no equipment in sight!