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.
Heat pumps are best suited for climates with moderate heating and cooling needs; for colder regions, a dual-fuel system pairs a heat pump with a back-up fossil-fuel furnace. Typical costs: Installing a small through-the-wall or window unit air-source heat pump to cool and heat a single room costs about $500-$2,000. 1  Expect to pay about $2,000-$8,000 for installation of a whole-house air-source heat pump system in an average home (three-ton capacity) with existing usable ductwork. The total costs can double or triple to $4,000-$24,000 or more if new ductwork must be installed or failing ductwork must be replaced.