class UsageLibrary:
  def __init__(self):
    self.standard = 1
    self.internal_gains = [4.2]
    self.heating_setpoint = [20.0]
    self.heating_setback = [16.0]
    self.cooling_setpoint = [25.0]
    self.hours_day = [17]
    self.days_year = [365]
    self.min_air_change = [0.34]