Table 1. Selected contributors to energy use in hotels and their frequency in sampled studies.

Dimension	Variable	Description	Frequency
Building characteristics	Floor area	Hotel gross floor area (m2)	30
	Guestrooms	Hotel number of guestrooms	21
	Star level	Hotel category level (1 to 5)	5
	Construction year	Hotel construction year (year)	5
	Building age	Hotel building age (years)	4
	Number of floors	Hotel number of floors (stories)	4
	Guestrooms area	Hotel total guestrooms area (m2)	3
	Retrofit	Years after the last retrofit (years)	3
Economics	Occupancy	Hotels occupancy rate (%)	21
	Guest-nights	Number of guest-nights sold	8
	Number of guests	Total number of guests received	5
	Food covers	Number of food covers sold	4
	Room revenue	Revenue per available room or room average rate	4
Social	Number of employees	Hotel total number of employees	7
	Employees density	Number of employees per m2	4
Environmental	Carbon emissions	Metric tons of CO2e emissions	3
	Outdoor temperature	Mean outdoor temperature (°C)	3
	Water use	Water used in hotel operation (m3)	3