An open source simple RC dynamic building energy model. Combine input power, temperature and solar data from monitoring with a simple RC model to estimate the heat loss rate of the building.
Repository also contains direct heating and heatpump simulation example.
This work is all open source - under GNU Affero General Public License Part of the OpenEnergyMonitor project: http://openenergymonitor.org
A multi-stage dynamic RC type model of a building appears to give a good fit to monitored internal temperature in a simple building.
See: dynamic_model.ods