The atmosphere around the planet is directly heated by the sun and by human activity; the heat mass of the atmospheric air is very significant and constitutes a vast resource of energy that can be recovered and used thanks to air-to-water or air-to-air heat pumps.

The air-to-water heat pump absorbs calories which are naturally present in the outside air. It uses these calories to reach the desired temperature for hot water or cold water according to the needs of heating or cooling.

The outside air temperature varies constantly

The efficiency of a heat pump depends on the temperature difference between the cold fluid and the hot fluid.

The efficiency of an air-to-water heat pump will vary during the heating season according to changes in the outside temperature. It is obvious that a very cold region is less disposed to the installation of an air-to-water heat pump than a region with a mild climate. But rather than the extremity of the temperature itself, it is the frequency with which these cold periods occur that are important.

For this reason we take into consideration the degree days of each region for the entire heating period. These degree days, which have been established over an average of 30 years, are used in our software to calculate energy consumption and the choice of equipment.

Take the example of two towns, Besançon and Abbeville, with a base temperature of -10°C, but with completely different degree day curves. In this case, although the two towns have the same base temperature, -10°C, Besançon has a much higher number of negative temperature degree days than Abbeville. An air-to-water heat pump is much more suited to the Abbeville climate than that of Besançon.

The air-to-water heat pump provides a particularly economical solution for heating in new housing.
New solutions are available for existing housing.

	Air-to-water heat pumps to replace a boiler
	Air-to-water heat pumps for use in addition to a boiler