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It could be added but I'd suggest buying the OEM Volvo wiring diagram for you car first from 1-800-25-volvo so you can wire it exactly as it would be if factory installed.
You'll need both seat heater elements (per seat, upper and lower), the wiring harneses for it, seat heater thermostat, switch.
Unless you like upholstery work (where you'll need a hog ring pliers and hog rings), installing the elements won't be fun for you but it's possible.
On the other hand, there's places where they install aftermarket seat heaters too but I have no idea how costly that might be.
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