**3. BPE methodology**

The methodology in both case studies was broadly similar. Quantitative data on tempera‐ ture, humidity and CO2 levels was collected using Eltek GD-47 Transmitters linked to Eltek RX250AL1000 Series Squirrel Data Loggers. This was supplemented by Gemini TinytagPlus Data Loggers for temperature and humidity some rooms without a power supply (bath‐ rooms and toilets).

The Glasgow House was unusual in that as demonstration houses they did not have occu‐ pants. MEARU in conjunction with GHA developed a methodology for scenario testing whereby volunteers occupied the houses for two-week periods during which they were asked to follow set occupancy 'scripts' for behaviour. Heating and environmental controls were fixed in the script and users were asked not to change these. Thus occupancy and be‐ haviour could be tightly controlled, allowing an examination of the environmental perform‐ ance under known conditions

In the Glasgow House, additional qualitative information was gathered using occupant dia‐ ries, record sheets for key activities such as fan operation and boost switch use, cooking, and window opening. The inhabitants of the house were each given diaries to record their dayto-day activities. This included the documentation of house occupancy periods, personal sanitary routines, and the use of individual electrical equipment. Cooking periods and kettle use were recorded separately, as well as instances when the boost switch was used on the extract for the MVHR system, usually in association with showering or food preparation. Room occupancy levels and window opening was also documented. Participation in post occupancy evaluation (POE) questionnaires allowed for the occupants qualitative and func‐ tional responses towards the houses to be gathered.

In Gilmores Close, due to the more vulnerable nature of the occupants (a high proportion of which have special needs), a semi-structured interview was conducted with residents and office users to query patterns of occupancy, user behaviour and comfort. This was supple‐ mented by surveyors observations, photographs and thermographic imaging
