1. Measurement of the performance of domestic air to air heat pumps. R K Cattell. Energy Research, 3 181–7, 1979
2. Domestic application of small heat pump units. P Freund. Proc Int Cong Refrign. 1979
3. A heat pump installation in a school classroom. R K Cattell. Heating and Ventilating Engineer, Oct 1978
4. The cost-effectiveness of some measures for energy conservation in buildings in the UK. P Freund. Proc CIB Symp, Energy Conservation in the Built Environment, Copenhagen, 1979
5. Energy Conservation: A study of the cost-effectiveness of some means of reducing energy consumption in buildings. Report of a working party. Forthcoming BRE Current Paper