Air source heat pump questions

• How do air source heat pumps work?
• I need to fit two heat pumps in a property because the largest 11kW heat pump isn’t big enough. Can I join the heat pumps together?
• What is the lower limit operating temperature of an air to air heat pump?
• What is the most efficient flow water temperature setting for air to water pumps?
• Can heat pumps be installed in existing buildings?
• What is the Design Life of a heat pump, and collector system?
• Where can a Greensource air to air heat pump be used?
• How is the efficiency of an air source heat pump measured?
• How should the air to water unit be sited to ensure the airflow and access it needs?
• How does a heat pump work?
• What planning requirements should be considered?
• What warranty is available?
• What is the lower limit operating temperature of the air to water heat pumps?
• Can an air to air heat pump be used to cool the home as well as providing heat?
• Do they make much noise?
• Can the external air to water heat pump unit be hidden behind bushes, trees and fences?
• What benefits do air to water heat pumps offer over ground source heat pumps?
• What Maintenance is required for heat pumps?
• What are the key maintenance requirements for a Greensource air to air heat pump?
• Do you install or supply only?
• What size radiators should be used on heat pump installations?
• Do heat pumps heat swimming pools?
• Which refrigerant is used in Greensource air to air heat pumps?
• Is there any government funding available for air source heat pumps?
• What size of cable should be used to connect the air to water unit to the mains electricity supply?
• What type of building is suitable for heat pumps?
• How much Vat is charged?
• Is there a training course available?
• How efficient are air source heat pumps?
• What are the key maintenance requirements for Greensource air to water heat pumps?
• What is an air source heat pump?
• Will it heat a building on the coldest winter day?
• Can an air to water heat pump be used to cool the home as well as providing heat?
• Which refrigerant is used in Greensource air to water heat pumps?
• I am stuck for space. Can I run the pipes in a single deeper 2 metre trench and lay the first collector in the bottom, cover with 1 metre of soil and then lay the second collector and cover with another 1 meter of soil?
• How should the unit be sited to ensure the airflow and access it needs?
• Where should I put a heat pump?
• Can you combine radiators and underfloor heating when using an air to water heat pump?