def _calc_epa_func(thermostat):
    """ Takes an individual thermostat and runs the
    calculate_epa_field_savings_metrics method. This method is necessary for
    the multiprocessing pool as map / imap need a function to run on.

    Parameters
    ----------
    thermostat : thermostat

    Returns
    -------
    results : results from running calculate_epa_field_savings_metrics
    """
    results = thermostat.calculate_epa_field_savings_metrics()
    return results