Is this for the bed or for the couch?
If it's for the couch, you may think I'm nuts (and probably justified), but instead of an electric blanket I highly recommend the
Slanket.
My wife is also cold all the time, and so was my dad. We got him a Slanket last Christmas and he used it all the time. This year someone at work bought one for my wife and she loves it. Sometimes it's even too warm for her, so an electric blanket is unnecessary (and I got her one last year).
To be perfectly clear: I
am not talking about a Snuggie. The Snuggie is cheap and feels like it. You can pick one up at your local grocery store or CVS, and it fits in a box about one cubic foot. The Slanket, which was first to market but not as well advertised, comes in a large plastic zippered bag, as you'd see holding a quilt or comforter at your local department store. It must be about 5 times the volume of the Snuggie.
Yes, we are very serious in our home about the Slanket. Very serious indeed. After all, it's the product of choice for Liz Lemon and her night cheese.