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Particularly in the presence of a hydrothermal system, many volcanoes outputlarge quantities of heat through the transport of water from deep within theedifice to the surface. Thus, heat flux is a prime tool for evaluating volcanicactivity and unrest. We review the volcanic unrest at La Soufri\`ere deGuadeloupe (French West Indies) using an airborne thermal camera survey, andin-situ measurements of temperature and flow rate through temperature probes,Pitot-tube and MultiGAS measurements. We deduce mass and heat fluxes for thefumarolic, ground and thermal spring outputs and follow these over a periodspanning 2000--2020. Our results are compared with published data and weperformed a retrospective analysis of the temporal variations in heat flux overthis period using the literature data.  We find that the heat emitted by the volcano is 36.5 +/- 7.9 MW, of which thefumarolic heat flux is dominant at 28.3 +/- 6.8 MW. Given a total heated areaof 26780 m2, this equates to a heat flux density of 627 +/- 94 W/m2, which isamongst the highest established for worldwide volcanoes with hydrothermalsystems, particularly for dome volcanoes. A major change at La Soufri\`ere deGuadeloupe, however, is the development of a widespread region of groundheating at the summit where heat output has increased from 0.2 +/- 0.1 MW in2010 to 5.7 +/- 0.9 MW in 2020. This change is concurrent with acceleratingunrest at the volcano, and the emergence of two new high-flux fumaroles inrecent years. Our findings highlight the importance of continued and enhancedsurveillance and research strategies at La Soufri\`ere de Guadeloupe, theresults of which can be used to better understand hydrothermal volcanism theworld over.

A multi-decadal view of the heat and mass budget of a volcano in unrest: La Soufri\`ere de Guadeloupe (French West Indies)