You have to purchase a furnace for your factory Easy Heat furnaces cost $4,000 to purchase the cost to run the furnaces is $1,800 per year Easy Heat furnaces last for 5 years. Hot Heat furnaces cost $6,000 to purchase. The cost to run the furnaces is $1,000 per year Hot heat furnaces last 10 years The discount rate is 18 percent which furnace should you purchase