How to assess sun exposure before renting an apartment

Sun exposure influences the brightness, temperature, humidity and even the energy use of a home. Even so, it is often set aside when choosing a property. This analysis shows how to assess sunlight before renting, with scenarios, criteria and a comparison matrix.

Scenarios

• Morning sun. It tends to be gentler, and helps light and warm the space pleasantly early in the day.
• Afternoon sun. It can be hotter and overheat rooms in warm climates, but is welcome in cold ones.
• Little direct sun. Cooler, shadier rooms, which can become dark or damp.
• Sun all day. A lot of light, with possible excess heat and a need for protection.

Criteria

1. Window orientation. It depends on the hemisphere. In the southern hemisphere, north-facing facades tend to get the most sun through the day; in the northern hemisphere, south-facing ones. Use a compass on your phone.
2. Time of visit. Visit at more than one time, if you can.
3. Season. The angle of the sun changes, and what you see in summer may differ in winter.
4. Obstacles. Neighboring buildings, trees and awnings can block the sun.
5. Floor and view. Higher floors tend to get more light.
6. Important rooms. Bedroom, living room and the area where you spend most time.
7. Ventilation. Sun and ventilation together help control damp.
8. Plants, drying racks and clothes drying. They depend on light.

Strengths and limits

Good sun exposure can improve comfort, reduce the use of artificial lighting and help keep the space dry. In warm climates, though, too much sun can call for air conditioning. A single visit gives only a sample, and future construction on neighboring plots can change the situation.

A simple comparison matrix

Give each property a score from 1 to 5 for orientation, light in the main rooms, excess heat, ventilation and obstacles. Add up and compare, together with price and location. Ask current residents what the sun is like in each season.