For those of you who use a warming box or similar

For those of you who use a warming box or similar, what's your set up like?  When do you find it mosr useful (symptoms and situations)  and when is it not worth a try?

Looking at improving my set up as I'm beginning to suspect the books I learned from are more utter neglect style of lambing than I want.  Curious whatother people use.

Do you mean for keeping a newborn bummer warm? If so, for my bummer goat kids (that are typically quite a bit smaller than lambs), I use a cooler, with a warmed rice bag, in a big zip-type bag, tucked under a thick towel. Then instead of the cooler's lid, I top the whole thing off with another towel.

I've also used a thick cardboard box, instead of the cooler, or a heat lamp above, instead of the rice bag under them.

The books say if the lamb is unresponsive to wuzzing and vigorous rubbing, a warming box will bring it back to life.  

My expierence says differently, so I wondered if I could improve my set up.

A cooler sounds useful.  I've been using old tshirt and a seedling mat as it's not supposed to get much above 25C.

Large card board box with 1 or 2 infrared 400 watt heater bulbs shining from above. Usually in the entry way sitting on insulation to protect it from the cold concrete floor.  Usually has a heated baby pig mat on one half of the box floor.  Towel dry then they live in the box, bottle fed, for 2 or 3 days before moving them out with the rest of the bums.