1867 - 1919. In 1917 Madam C.J. Walker was one of the wealthiest women in the United States. She developed a line of cosmetics and hair products especially for African-American women. She trained many women to become sales representatives. She once told a group of women,
Adding central air usually costs about $4,000 for 2,000 square foot home, if the home already has duct work in place. That price includes installation. If the home does not have ducts, the total cost could rise to as much as $8,000 to $10,000.Even though the price of central air is similar to a heat pump, donât forget that youâll also have to buy and maintain a furnace for heat.hat price includes installation. If the home does not have ducts, the total cost could rise to as much as $8,000 to $10,000. Even though the price of central air is similar to a heat pump, donât forget that youâll also have to buy and maintain a furnace for heat.
The following are the most common home HVAC systems that require ductwork: Central gas heating; Geothermal heating; Furnace heating; Central air conditioning; The same ductwork installed for heating systems can also be used for air-conditioning. Materials. The average cost of ducting is $16-$19 per 10 linear feet. 1  Itâs recommended that you buy a few more linear feet than you need. General guidelines are: 2  10 linear feet - 2 extra. 3  30 linear feet - 3 extra. 4  50 linear feet - 4 extra. 5  70 linear feet - 5 extra. 6  100 linear feet - 7 extra.