What are the key steps involved in attic furnace installation?

The key steps involved in attic furnace installation include:

1. Planning and preparation, including measuring the space and ensuring proper ventilation.
2. Removing the old furnace, if necessary.
3. Installing the new furnace according to manufacturer's instructions.
4. Connecting the ductwork and electrical components.
5. Testing the furnace to ensure it is working properly.
6. Insulating and sealing the area around the furnace to improve efficiency.