Geothermal Heat Pumps are usually associated with hot air heating and air conditioning. In climates that very seldom need air conditioning you need to concentrate more on heating. There is a very good way to use geothermal technology for very efficient and comfortable heating. Radiant floor heating can very easily be combined with a geothermal heat pump to give both comfort and efficiency.Radiant floor heating has been the comfort and efficiency standard for many years. The feeling of a warm floor under your feet is priceless. Romping on the floor while playing with the children is great when the snow is blowing and the floor is pleasantly warm.By using these principles to combine two very great heating types you can have a very good heating system that perform very well for many years. The only other factor with this type of system is that you don not have the ability to get cooling from the system. That is probably the only drawback of this type of system. It would be great if there was a geothermal unit made that was heating only. The elimination of the reversing valve would be a cost savings and a plus overall. This system is best suited for cooler climates that require little or no air conditioning.

If you decide to install this type of system make sure that the installer knows exactly what they are doing. This type of system requires many things to be done exactly right so that the water flows will allow the system to work correctly. The piping on the well side is very critical that it uses all the wells equally. On the house side the piping must be primary/secondary. Pumps and pipe sizes must be able to give very high flow rates so that temperature drop is kept to ten degrees or less. When working with such low temperature the piping and pumping becomes so much more critical.
You will have to drill a few wells to extract the heat from the ground. The piping must be installing in the wells correctly for the system to work properly. The heat pump needs to be designed for hot water heating. You can not use a heat pump designed for hot air use and make it work for radiant heating. The radiant heat design must be figured to use water temperatures that are cooler than many radiant heat systems. A maximum temperature design should be 130 degrees F. To get this kind of design to work correctly you will have to use good quality heat plates and insulated under the heat plates. By following these guidelines I have designed systems that have heated houses very comfortably at temperatures well below zero.
 

Source: Swimming Pool Heat Pump,   Heat Pump