08 January 2007
The retrofi t of heating systems represents a signifi cant market in France. Nowadays, high-temperature
heat pumps make an interesting alternative to boilers, with real advantages in term of CO2
emission and energy effi ciency. Another advantage of heat pumps lies in the energy that can be
saved over a year. The HSPF (heat seasonal performance factor) is therefore the most appropriate
parameter for relating to actual heating energy bills. HSPF is the ratio of the total heat delivered
over the heating season to the total energy input over the heating season. In the study, fi eld test
results on a French house will be presented, as results of simulations calculating the HSPF.