These work the best and they're cheap. http://www.amazon.com/Victor-Electronic-Mouse-Trap-M2524/dp/B000E1RIUU/ref=sr_1_1?ie=UTF8&qid=1450721981&sr=8-1&keywords=electrocuting+traps
We used these at our previous place in our fieldstone cellar a few winters ago when we had -50 windchills in February.
I didn't feel comfortable letting my girls work in there due to the cold.
Don't be fooled by the more expensive ones. They break after a few uses.
Thank you I do believe I'll order a couple of these and put one in my attic too. Wonder if they have them for rats?