Abstract: The present invention relates to a method and arrangement for using a low-energy source for controlling the air temperature in a room space (5). In the invention, the ratio of the desired inside air temperature in the room space (5) to the outside air (10) temperature is compared. Furthermore the temperature of a heat transfer liquid coming from an extraction circuit (1) is determined. On the basis of these detected temperature levels, heat energy of the heat transfer liquid is regulated, if necessary, after which the heat transfer liquid is channelled to a supply air radiator (15) controlling the temperature of air (7) to be supplied to the room space (5) in order to control this air temperature. At the end of the circulation, the heat transfer liquid is channelled via a return circuit (3) of means back to the extraction circuit (1).

Abstract: A system for utilizing low energy includes a terminal, a heating circuit and a ground circuit, wherein heat bound to a medium circulating in the ground circuit is transferred with the terminal, such as a ground heat pump, to the heating circuit. The ground circuit is implemented with an inner pipe and outer pipe surrounding it in such a way that the outer end of the outer pipe is closed, wherein, depending on the flow direction, the medium can move at the end of the pipe from the inner pipe to the outer pipe and vice versa. Further, a pipe for utilizing low energy is provided.

Abstract: A system for a low-energy network includes a collector circuit (1a, 1b) filled with a first transfer solution, a heat transfer circuit (7) filled with a second transfer solution, and a terminal (3) adapted to transfer heat between the transfer solutions of the collector circuit (1a, 1b) and the heat transfer circuit (7). The collector circuits (1a, 1b) are connected to the terminal via two distribution reservoirs (82, 81), of which the first distribution reservoir (81) is isolated and configured to receive and transfer heated transfer liquid, and the second distribution reservoir (82) is configured to receive and transfer cooled transfer liquid, and at least one collector circuit (1a, 1b) connecting the first distribution reservoir (81) and the second distribution reservoir (82) is connected to each distribution reservoir (81, 82) terminating the low-energy network. The system may also include a distribution tank (80) for the low-energy network.