That requires electricity, but those solar panels aren't going to be very effective when it is overcast and rainy.
Why not just go for getting a thorium reactor to work and then use them instead?
On stormy days, also, wind generators will be generating a lot more power than usual. They are more than likely capable of heating your blanket.
Although less efficient, power on days when intermittency is high can also be transferred from pumped water storage and from hundreds of miles away where it might be sunny and windy.
http://en.wikipedia.org/wiki/IEC_61400
I would imagine that high wind rating turbines are more expensive.
This is why I asked for figures on the overall effect - covering all models. I'm not seeing anything so far to convince me that its effect is more than negligible.
Good thing that wind turbine is going to be cranking. :-)