Wow, thanks for the kind words guys. It's nice to be appreciated.
Ha ha... needful things. Mike's comment made me laugh. It's all part of my evil plan to run Aircraft Spruce out of business. ;-) If only! I've still got my day job and no plans to leave it!
But seriously, the amperage on most seat heaters isn't that bad, typically about 6 amps per seat on high. Not 6 amps per pad (there are usually 2 pads per seat), but 6 amps total per seat.
Also, if your interior is finished, you can often add seat heaters easily, particularly at the condition inspection when it's all open anyway.
Many seats are closed with a zipper along the back or bottom edge. You can often simply slip the seat heater inside and simply let the wiring come out from the tiny hole at the end of the closed zipper.
In my plane I installed a couple quick disconnect jacks in the floorboards so I could easily remove the seat cushions without any wiring issues.
Anyone who can build or maintain a plane can install these things PDQ. And your wife will love you for it!!!