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Thermal variations across space affect the use of space within a dwelling. Older people show interest in and understanding of thermal behavior of dwellings. Older people pursue the thermal conditions they desire. Older people take actions to modify the quality of the thermal environment in their house. Changes made to the house may not be solely motivated by thermal comfort concerns. a b s t r a c tThe UK's carbon dioxide reduction policy initiatives often treat environmental conditions in buildings as averaged values of air temperature that flatten spatial variations. This discounts the influence of varying thermal conditions on how people use buildings and the impact this may have on energy consumption. This paper explores the intersection between older people's thermal experience, spatial and temporal variations in thermal conditions in a dwelling and the influence this has on occupants' use of space. The paper reports on qualitative studies in homes with both conventional and newly installed low carbon heating systems. The results suggest that older people are sensitive to and adept at exploiting variations in the dynamic 'landscape' of warmth to achieve desired thermal preferences and that they modify their dwellings to improve the quality of the thermal environment. There is also some evidence of a 'spatial rebound' effect after energy upgrades, when occupants inhabit rooms they previously could not afford to heat. The nature of qualitative research precludes robust recommendations for policy. However, one important avenue to explore further appears to be that householders may be more strongly motivated by interventions offering improvements across a range of aspects rather than on energy savings alone.

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Building designers face increased pressure to design low-energy buildings. Consequently, there is a growing interest in providing computational support for low-energy design via building performance simulation. This article presents an ethnographic study that investigated the design process of five low-energy buildings in England and Wales. The study was informed by design science literature and phenomenology of technology. The investigation analysed the methods deployed by designers to embed low-energy performance during design problemsolving. The findings illustrate how experience-based methods and simulation tools were used to inform low-energy building design. The work identified some of the challenges faced by designers to incorporate simulation methodologies during a routine design process. It illustrates the status of simulation tools as boundary objects that mediate the communication and negotiation between design team members. The work advocates considering the design problem-solving patterns and preferences in the development and improvement of support methods for low-energy design.ARTICLE HISTORY

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