Before discussing the results, it is important to mention that the survey response rate was low (15.5%: 27 respondents) and the top three ranked buildings accounted for 56% of total responses. This incurs potential participation and non-response biases. The main challenges reported in the interviews of this study by lower ranked buildings, such as a lack of information and of involvement, were not as clearly shown in the survey responses or comments. Therefore, it is of importance to consider both the interviews and surveys of this study when discussing possible indications. Considering the variation of performance during the competition, indications of occupant behavior determinants that influenced this variation are discussed as follows. These determinants may thereafter be of interest to be explored further in future research.
5.1. Key Success Factors
The most frequently reported success factors during the interviews, among both higher and lower ranked buildings, involved communication among co-workers, and project champions, or advocates. A project champion was interestingly not emphasized by interviewees in the winning building, Building A. Interviewees in Building A rather highlighted the importance of collective leadership and a group effort for energy conservation. This indicates that the need of a leader among the occupants is uncertain. In the survey results, a significant majority ranked communication, collective effort, as well as leadership as, important or very important. Staddon et al. [
21] similarly emphasized the role of group dynamics, social interaction, and middle management in influencing behavioral change in the office context. Numerous authors also discussed the importance of social influence, or public perception, as an important psychosocial motivator in feedback systems [
24,
29]. Similarly, it can be suggested that the collective effort and engagement expressed to have taken place in higher ranked buildings strengthened the occupants’ reduction in energy consumption. This may be related to the development of social settings for occupant behavior change, linkable to the element of subjective norms or public perception in the TPB. Konis et al. [
4] also found strong group identification and public perception to be linked to higher energy conservation in student dormitory competitions.
Interviewees also discussed competitiveness among peers as a success factor, and real-time progress visualization as a driver of this competitiveness, as well as of awareness of impacts on energy consumption. This feedback increased awareness of energy data as well as direct capabilities to affect it. However, it is important to note that it was interviewees in the top three ranked buildings that emphasized these points during the interviews. Moreover, Building B interviewees noted that occupants were competitive because their field of work and activities are related to the competition in terms of building technology and energy. However, other high-ranked buildings conduct a variety of activities, such as legal or retirement services. It is uncertain if the activities carried out in a building affects occupant engagement in energy conservation programs—potentially an area of interest for further research. The remaining interviewees in Buildings E and G noted that there was a lack of engagement and attention to energy visualization in their respective buildings. This indicates that approaches for engagement, including visualization, may be of interest for further exploration. It is suggested that the feedback obtainable from energy consumption visualization may influence the perceptions of consequences (attitude) and perceived control of energy consumption, under the TPB. Inyim et al. [
6] also emphasized the potential of comparative feedback in relation to peers to stimulate individual energy use reduction. Real-time targeted feedback has indeed been found useful in promoting energy conservation through information and comparison-based strategies in numerous previous studies [
10,
14].
As seen in survey results, there are no clear indications that the motivation of a prize or internally created incentives, are widely considered as an important success factor. In addition, the influence of a prize, as well as motivation to lead a sustainable lifestyle, yielded non-significant results. This may not mean that these factors are to be ruled out, but rather suggests that other factors may have been more influential for energy conservation during the competition. Furthermore, energy-saving tips and increased awareness were ranked as important success factors. Inyim et al. [
6] highlighted the potential of personalized feedback and tips consistent with occupants’ behavior based on real-time data in building energy-saving interventions. Staats et al. [
22] found that personalized as well as collective feedback contributed to gas consumption reduction in an office building.
New habit development was reported as a success factor in the interviews, and strategy and routines, in the surveys. The top three ranked buildings noted habit development in the interviews. The competition as a reminder to conserve energy, was also seen in the surveys as a significant success factor. It can be suggested that awareness, routines, and habits were potential success factors for energy conservation. The multidimensionality of long-term change, as explained by Frank [
34], involves behavioral change as a systemic undertaking which may lead to the replacement of old standpoints and habits. This paper can demonstrate short-term behavioral change that attempts to offer useful insights on drivers that may begin to stimulate such change. It is essential, however, to differentiate between short- and long-term behavioral change.
In terms of the TPB, the short-term behavioral change explored in this study may be linked to intention driven by self-efficacy and temporary attitude changes rather than habituation. Knussen & Yule [
33] and Konis et al. [
4] discussed similar prospects. The long-term effect of the competition is questionable, also considering the convergence of energy consumption levels following the BoB. In terms of the five-domain experiential system [
34], this indicates that the emotional and worldview-related domains were not influenced for long-term change, but rather rationality in the short-term. In regards to the rebound effects and convergence of post-competition energy conservation levels seen among the participating buildings, it would be of interest to further explore long-term occupant behavior change. Furthermore, it may be important to consider that these post-competition trends may be linkable, not only to occupant behavior, but also other factors, such as varying occupancy. In order to understand the transformation of short-term behavioral change to long-term impact through habit modification, further research on the dynamics of this transformation and how to sustain it is needed.
5.2. Key Challenges
There are also a series of reported challenges in the interviews. All interviewees noted decreased thermal comfort as well as contingencies as key challenges for energy conservation. Thermal comfort can pertain to levels of illuminance, indoor air temperatures, and air quality such as humidity [
13]. In the current study, interviewees described decreased comfort with regard to an increase in indoor temperature and humidity levels. Contingencies pertain to factors out of the participants’ control, such as certain office appliances and automated systems. Lack of control was also noted as a challenge during the interviewees, among both higher and lower ranked buildings. In the surveys, it was also commented that an increased control of office devices, such as accessible outlets and sensors, can further contribute to energy conservation activity.
Interviewees in lower ranked buildings also reported a higher number of challenges, including lacking involvement in competition-planning, information, coordination, and control of appliances. Such challenges may have inhibited the attitude, social group dynamics, and perceived control needed for behavioral change as advocated by the TPB [
30]. As highlighted by McKenzie-Mohr [
28], it is imperative to find and address barriers of change in specific groups, corresponding to community-based social marketing. This may indicate that information-sharing and inclusive management would need to be improved at the onset and throughout the competition, for enhanced coordination and engagement. With improved participant involvement and coordination, for example via competition co-planning, it can be suggested that prospects to find and address barriers may be managed.
The survey results related to perceived challenges at large show non-significant findings with the exception of, a lack of time, to carry out energy conserving-activities. This was ranked by a majority as an unimportant or somewhat important challenge of energy conservation during the competition. A challenge noted by all interviewees, comfort, was ranked by 12/27 respondents as important or very important. This significance is uncertain as nearly the same quantity (11/27) rated this as unimportant or somewhat important. Experiences of challenges seemed to vary more than of success factors. The statistically stronger indications for success factors as opposed to perceived challenges may suggest, (1) a need for further studies on potential challenges of occupant behavior change for energy conservation, and (2) further exploration on how to leverage identified success factors.
When contrasting the challenges and success factors reported by lower and higher ranked buildings, it can be suggested that there is a need for improved communication internally within buildings, as well as among participants and competition coordinators. The main challenges reported distinctively by interviewees in lower ranked buildings included lacking involvement and information. This could potentially be tackled with strategies leveraging the success factors reported by higher ranked buildings, such as collective team work, communication, and engagement. This is considering the positive impacts of co-worker engagement on memory to conduct energy-conserving measures, as reported by interviewees in higher ranked buildings. Adopting both top-down managerial policies and bottom-up engagement strategies may be important in successfully influencing occupant behavior, similarly highlighted by Elsharkawy and Rutherford [
29]. It would be important to support communication among occupants to leverage elements of social influence in energy conservation interventions [
6]. In this context, it is suggested that relationship management would be important for improved coordination among all relevant players, and control and involvement among participants. Increased communication channels, such as between facility managers and occupants, may for example contribute to overcoming to the challenge of a lack of device control and abilities to influence office power consumption among occupants.
5.3. Multi-Dimensionality of Behavioral Change
The reported success factors and challenges concern both the individual experiences of participants, such as awareness and memory, and group dynamics such as social learning and team efforts. It can be suggested that behavioral change in commercial building energy competitions is linkable to both individual and organizational dimensions, similarly highlighted by Staddon et al. [
21]. These two dimensions can be analyzed in terms of price, psychology, physical elements, personal factors, public perception, and policy, as seen in the 6-P framework [
26]. Price is omitted for this study, as electricity costs were not relevant to occupants in the BoB. In terms of individual psychology, the competition and progress visualization were expressed as reminders to conserve energy, and facilitators of awareness of energy consumption. Physical elements involve building and technology features, such as of thermostat adjustability. In terms of personal factors, findings indicated that occupants perceived the creation of new habits, strategy and routines as success factors. In terms of public perception, emphasis by occupants on collective engagement, communication among co-workers, and a team effort, indicates the importance of subjective norms and conducive social settings. As for the policy element of the 6-P framework, the BoB can be seen as a top-down initiative for change. However, the importance of bottom-up involvement for occupant engagement and coordination, in addition to building awareness about energy conservation, is highlighted by several authors [
25,
26,
27] as well as by BoB participants.
This multidimensionality of behavioral change can also be discussed based on the TPB [
30], which states that an action can be managed through creating a positive affiliation with perception of consequences (attitude), instilling confidence in an ability to carry out the behavior (control), and leveraging social influence (subjective norms). These three constructs are arguably influential for the success of the top three contestants of the BoB. At large, the surveys show significant results that suggest a general increase in confidence and activity related to energy conservation among the participants following the BoB. This might suggest that the competition facilitated an increase in perceived control and attitudes towards energy conservation. Moreover, several respondents who reported no change nonetheless also reported higher levels of confidence and activity already before the BoB.
Through the real-time visualization of building performance, it is suggested that potential positive consequences (attitude), as well as abilities to conserve energy (control) were clarified. Keskin and Menguc [
7] similarly discussed mobile platforms as a facilitating condition under the TIB for visualization of thermostat energy savings, to demonstrate ease of use, and to provide direct feedback. In addition, the importance of public perception as discussed earlier, involving factors such as, team effort and collective thinking, indicates the importance of subjective norms and social influence among peers. Interviewees in top-ranked buildings also highlighted the importance of competitiveness for energy conservation during the competition. Mobile platforms, such as smart phone applications, may also be leveraged in social sharing, learning [
7], as well as for competition and peer-comparison purposes.
The findings indicate that both technical and social aspects would be important considerations when developing approaches for occupant behavior for energy conservation. Following this, Roberti et al. [
20] demonstrated in simulations that technical measures for building energy conservation can be strengthened by incorporating occupant behavior, especially pertaining to the management of heating, ventilation, and air-conditioning. The authors found that behavior, such as opting for natural ventilation, can add to energy conservation coupled with technical measures, such as improved insulation [
20]. In future developments and research, it would be important to explore and discuss the integration of social and technological approaches to occupant behavior for energy conservation.
Considering the complex and interdisciplinary nature of occupant behavior [
13], intervention and conservation approach development would benefit from multi-disciplinary teams [
20]. It can be suggested that by incorporating various fields, such as engineering as well as social sciences, developments for energy conservation in commercial buildings can be expanded. With the single case study explored in this paper, findings are not generalizable to populations but may be useful in developing initial propositions related to occupant behavior and implications for future research and development. Based on the findings of this study, and on ensuing discussion, the following measures and their influence on occupant behavior in commercial building energy conservation competitions are suggested for further exploration:
Bottom-up involvement: For example, via (a) an introductory meeting and co-planning with all occupants and relevant facility managers, (b) kickoff/brainstorming meetings in each building, including facility managers, to discuss competition strategies and internal planning. This may contribute to several success factors, including involvement, coordination, leadership, team effort, strategy and routine creation, engagement, and communication among occupants.
Stakeholder relationship management: For example, pertaining to (a) improved relations among occupants and facility managers able to carry out adjustments, upgrades, or repairs of building equipment. It is suggested that the challenge of lacking (appliance) control can be tackled.
Targeted information: For example, (a) regular performance reports collectively for each building and for each individual coupled with targeted, actionable feedback on how to further improve energy conservation efforts. This may contribute further to success factors including energy saving tips, awareness, engagement, and the competition as a reminder to conserve energy.
Real-time visualization: For example, with (a) clearly shown progress demonstrating abilities to impact energy consumption, (b) peer comparison. This may contribute to success factors of the competition as a reminder to conserve energy, increased awareness, progress visualization, and competitiveness.
Mobile social platform: For example, (a) as a facilitating technology to support social interaction, information-sharing (feedback, tips), progress visualization, communication, and engagement in an integrated manner.