When a listing or an agent says a house "faces south", they almost always mean the front door. The sun does not care about the front door. It cares about which way the windows face in the rooms you will actually use — the living room, the kitchen, the bedrooms — and in a lot of houses those are at the back. A house that "faces north" often has its best rooms looking south.
So the useful question on a viewing is not which way the house faces. It is which way each room's main windows face, and how much direct sun that means in January and in July.
How much direct sun each side gets
The figures below are computed, not estimated. They come from the same solar-position calculation our sunlight tool runs, which implements the NOAA solar position algorithm and is checked against NOAA's published sunrise, sunset and noon sun-angle values for New York [NOAA]. Each figure is the time direct sunlight reaches an unobstructed vertical window facing that direction, on the shortest and the longest day of 2026. Trees, neighbouring buildings and roof overhangs will cut these numbers in a real house; what they show is the most each side can get.
Chicago means Cook County, Illinois. Phoenix means Maricopa County, Arizona.
| Window faces | Chicago, 21 Dec | Chicago, 21 Jun | Phoenix, 21 Dec | Phoenix, 21 Jun |
|---|---|---|---|---|
| North | 0.0 h | 7.0 h | 0.0 h | 7.8 h |
| East | 4.5 h | 7.6 h | 5.0 h | 7.2 h |
| South | 9.1 h | 8.1 h | 9.9 h | 6.5 h |
| West | 4.5 h | 7.6 h | 5.0 h | 7.2 h |
Two things stand out, and neither is what most people expect.
North gets no direct winter sun at all
On 21 December a north-facing window gets no direct sun in either place — 0.0 hours in Chicago and 0.0 in Phoenix. The winter sun stays in the southern half of the sky all day, so the north wall never sees it.
Summer is different. On 21 June the sun rises north of east and sets north of west, so a north window picks up direct sun early in the morning and again in the evening: 7.0 hours in Chicago, 7.8 in Phoenix. North-facing rooms are not sunless. They are sunless exactly when you would most want the sun.
That steady, indirect light is why north-facing rooms are often favoured for studios and home offices, and it is also why a north-facing living room can feel dim and cold for a third of the year.
South is the winter side, and in hot places the cooler summer side
In Chicago a south-facing window gets 9.1 hours of direct sun on the shortest day, against 4.5 for east or west. The low winter sun, 24.7° above the horizon at its highest, crosses the south side of the sky and reaches deep into south-facing rooms. That is the case for a south-facing house in a cold climate: the most light and the most free solar warmth in the months when both are scarce.
The surprise is summer in the South and Southwest. In Phoenix on 21 June, a south-facing window gets 6.5 hours of direct sun — less than east (7.2), west (7.2) or even north (7.8). At midday the sun is 80.1° up, almost overhead, and it rises and sets well north of east and west. A south wall with a modest roof overhang can be shaded for much of a summer day.
Further north the hours tell a different story, and the angle is what matters. In Chicago a south window still gets the most direct sun on 21 June, 8.1 hours against 7.6 for east or west, but the June sun peaks there at 71.5°, so it meets south-facing glass at a steep angle and less of its heat comes through, and a modest overhang keeps it out of the room altogether. East and west sun arrives low and close to head-on. That is why south is usually the easier side to keep comfortable in summer as well as the warmest in winter, which is exactly the combination a buyer wants.
West is the side that heats the house
A west-facing window gets its direct sun in the afternoon. In Phoenix on 21 June that runs from 12:32 to 19:41, the back half of the day, when outdoor temperatures are usually at their highest. East-facing glass gets the same number of hours (7.2), but in the morning, while the house and the air around it are still cooler.
That makes the west side the one to think about in a hot climate. A living room or bedroom with a large west-facing window can run noticeably warmer in the late afternoon, and the air conditioning carries that load. If the rooms you would use most face west, get the age of the HVAC system in writing before you make an offer. Replacement runs $6,000 – $15,000, and a unit already near the end of its service life will be doing the hardest work of any in the house. Our guide to how long HVAC systems last covers what a system's age tells you.
In a cold climate the same afternoon sun is welcome in winter, though on 21 December a west window in Chicago gets only 4.5 hours of it.
East is morning light
East-facing rooms get direct sun from sunrise until around midday: 7.6 hours on the longest day in Chicago, ending at 12:52. It suits a breakfast room, or a bedroom if you like to wake with the light, and it is the side that stays coolest through the afternoon.
How to check on a viewing
- Find true north, not the front door. Many phone compass apps can show true north instead of magnetic north. Switch that on, because the sun's path is measured from true north.
- Stand in each room you would use most and note which way its main window faces. Write it down room by room, not once for the house.
- Look up and out. Note trees, overhangs and neighbouring buildings on the south and west sides. The figures above assume nothing is in the way.
- Visit at the time of day you would actually use the room. A west-facing living room looks different at 5 p.m. than at an 11 a.m. showing. Our viewing checklist has the other things worth checking while you are there.
Check the rooms in your county
Chicago and Phoenix show the pattern, but the hours shift with latitude. Our sunlight tool runs the same calculation for your county and the exact way a window faces, and shows when direct sun reaches that room through the year, including the mornings you will never see at a midday viewing.