Getting furnaces up and down stairs in one piece?

Good link Mechanic. I've used a StairKing model for quite a number of projects, around 600 lbs/load (although I believe they still make models with a 1200 LB. capacity). Well worth the money for going UP stairs. If the machine is overloaded, a brief break will allow the DC motor to cool down and resume working. The batteries hold a charge for more than a reasonable amount of use. There are much better/faster options for going DOWN, however.