How many types of heat pumps are there?
See Types of Heat Pump.
Do heat pumps really save money and emissions?
See Facts About Heat Pumps.
What does the Energy Savings Trust trials demonstrate?
How are dehumidifiers classed as heat pumps?
Dehumidifiers: Firstly the air is cooled (evaporator) to below its dew point so that water condenses out of the air, removing moisture from the air stream. The same air is passed over the condenser coil where hot refrigeration gas re-heats the cold air. The result is that the air is reheated to beyond its original temperature (because the compressor energy is added to the process) with much less moisture in it than it originally had and hence the air is significantly dehumidified without losing heat.
This is a very energy efficient method of dehumidification which also results in supply temperatures being greater than inlet temperatures. It should be the default primary solution for applications such as Swimming pools etc but is often side lined by the short term view of cheaper but much less efficient solutions such as full fresh air.
What is the difference between a Ground Source Heat Pump and a Water Source Heat Pump?
See Types of Heat Pump.
Are all heat pumps also air conditioning/cooling units?
Heat Pump Efficiency
The efficiency of a heat pump system can be expressed purely for the unit itself and no external power requirements (e.g. pumps) or for the wider system whole or part) at a single standard operating point. In addition the efficiency can be expressed over the season and hence a range of source and/or delivery temperatures.
The table below summarises this in principle.

When considering the wider system there are various system boundaries that can be used.
See Glossary of Terms for CoP, CoSP, SCoP and SPF.
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