When reviewing a in the dialog, this graph displays the number of hours per year that and temperatures fall within a certain temperature range. This range is sometimes referred to as a temperature bin.
Use outdoor dry-bulb temperatures (Tdb) and wet-bulb temperatures (Twb) to analyze whether the project may be a candidate for different low-energy cooling strategies, such as natural ventilation, economizers, or evaporative cooling systems.
Economizers save on cooling energy costs. If the thermostat calls for cooling and the outdoor air is cool and dry, the economizer circulates outdoor air through the building without requiring the air conditioning compressors to be used.