Table 1 Indoor and outdoor temperatures at night and during the day

Night—1st part

Bare metal

31.49 (31.19–31.79)

3.37 (2.13–3.60)

–

–

 (21.00–00.00 h)

Red

30.26 (29.96–30.57)

3.08 (2.80–3.36)

− 1.23 (− 1.22 to − 1.23)

< 0.001

White

29.75 (29.40–30.09)

2.51 (2.25–2.76)

− 1.74 (− 1.70 to − 1.79)

< 0.001

Night—2nd part

Bare metal

29.43 (29.13–29.73)

3.41 (3.12–3.70)

–

–

 (00.30–07.00 h)

Red

28.42 (28.05–28.79)

2.78 (2.63–2.93)

− 1.01 (− 0.94 to − 1.08)

< 0.001

White

27.84 (27.43–28.25)

2.49 (2.26–2.72)

− 1.59 (− 1.48 to − 1.70)

< 0.001

Day

Bare metal

33.98 (33.52–34.44)

− 1.41 (− 1.71 to – 1.12)

–

–

 (07:30–20.30 h)

Red

34.42 (33.95–34.89)

− 2.47 (− 3.13 to − 1.82)

0.44 (0.43–0.45)

0.081

White

33.05 (32.70–33.40)

− 3.93 (− 4.75 to 3.11)

− 0.93 (− 0.82 to − 1.04)

< 0.001

Daily

Bare metal

30.69 (30.31–31.06)

2.10 (1.63–2.58)

–

–

 (00:00–23:30 h)

Red

29.91 (29.48–30.33)

1.37 (0.97–1.77)

− 0.63 (− 0.44 to − 0.82)

0.001

White

29.15 (28.71–29.58)

0.82 (0.21–1.43)

− 1.44 (− 1.41 to − 1.46)

< 0.001