In 1957, he made the first nonstop supersonic flight across the United States, flying from Los Angeles to New York in three hours and 23 minutes. Glenn was preceded in space by two Americans, Alan B. Shepard Jr. and Virgil I. âGusâ Grissom, and two Soviets, Yuri A. Gagarin and Gherman S. Titov. In April 1961, Gagarin was the first man in space, and his spacecraft Vostok 1 made a full orbit before returning to Earth. Less than one month later, Shepard was launched into space aboard Freedom 7 on a suborbital flight. In July, Grissom made another brief suborbital flight aboard Liberty Bell 7.
A heat pump will replace both the furnace and air conditioner/central air unit. The average cost to install a heat pump ranges from $3,949 and $6,701 depending on the size of your home and type of heat pump. Since a geothermal heat pump requires underground installation, its installation costs will be more expensive than the costs for the air-source type.
You can also choose to install electric heat, which comes from small registers located around the border of each room. Although the cost of installation averages between $1,000 and $2,000, this type of furnace isn't a good idea for heating large spaces and comes with high energy costs. One newer option gaining popularity is a heat pump, which pulls in heat from the air or ground using refrigerant coils. Air source heat pumps cost $1,500 to $7,000, while ground source may cost $7,000 to $25,000. These furnaces can be used as air conditioning units in summer, but many can't operate in extremely cold climates, limiting their efficacy.