Accurately determining stove use is important in assessing the impacts and dissemination dynamics of improved stoves programmes. It is also a key component in the calculation of emission reductions for trading carbon offsets, understanding
changes in fuel use and estimating impacts on indoor air quality. This article outlines the use of small, rugged, commercially available temperature dataloggers as stove use monitors (SUMs). Monitoring results are presented of the first weeks of use of 40 newly built and 10 5-year old improved chimney wood-fired cook stoves in the CRECER project area in the Guatemalan highlands.