Hey Don, Volvo's have what is called a "Cold Weather Package". This includes seat heaters, head light wipers, and possibly the track system.
From what I understand, all Volvos are wired for just about all of their options to make it easy to install accessories. So, it may be possible to get a drivers seat, a switch, a relay and have everything you need to heat that drivers seat.
Just a side note, most women love the heated seats.