1 Time from start of nest building to departure of young is 44 to 58 days. 2  Nest building is done by both sexes and begins around April. Both parents take turns incubating three to five eggs, which hatch after 12 to 17 days.  Brood parasitism is common among cliff swallows.
Geothermal heat pumps, which pull heat from the ground making them more reliable and efficient, usually cost somewhere between $9,000 and $23,000, including installation. The price for either style of heat pump is dependent on: The heat pump brand.
The average cost to install a heat pump ranges from $3,990 and $6,888 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.