Glad you asked...
The power must be completely off before you can install a furnace. Then, you will need to remove the old furnace, and adjust all the duct work for the new one. Level the newer furnace, and plug everything into it. For more information see here: ;
kjosenhans     How-To Expert
About   .  Privacy   .  AskEraser   .  Settings   .     .  Careers   .  Ask Answers   .  iPhone   .  Help   © 2013 Ask.com