Windows and doors can easily help or hinder your efforts at getting comfortable in your home or office. Air-flow and sunlight are the two biggest elements that furnishings can assist in accessing, while still still providing other benefits like Light & Vision Control.
In the warmer months, air-flow and proper ventilation can help reduce temperatures, while ultraviolet rays from the sun can dramatically increase the mercury. Obviously in winter, the opposite is the case. Additionally, in the cooler months, the right furnishing can also help retain room heat from escaping.
For windows on the east and western side of your home or office, consideration for the warmer months should be given to choosing a furnishing that will block solar heat, while still allowing for air-flow.
During winter, southern windows will need a covering that can help trap the heat within a room as there will be virtually no chance of external heat entering into the building.