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Shade sunny windows before the room heats up

Blocking unwanted sunlight can reduce heat entering through windows and the cooling needed to maintain comfort.

I commit
Miniature scene: Letting direct summer sun into the room.
Letting direct summer sun into the room
Miniature scene: Using existing shades before heat builds up.
Using existing shades before heat builds up
01 / Why this can help

Your scenario, drawn

Shade and the same cooling task

Shade and the same cooling taskWithout using the existing shades: 360 kWh; Using the existing shades: 300 kWh; Annual difference: -60 kilowatt-hours of electricityIN ONE YEARWithout using the existing shades360 kWhUsing the existing shades300 kWh0360 kWh

Same scale, starting at zero. Change the assumptions to compare the two annual totals.

Sources and scope →
Read the values
Without using the existing shades360 kWh
Using the existing shades300 kWh
Annual difference-60 kilowatt-hours of electricity
02 / One possible next step

On a warm sunny day, adjust an existing shutter or shade before direct sun heats the room, keeping useful daylight and necessary cooling.

03 / Sources and scope

Context-dependent outcome

What the evidence supports

Blocking unwanted sunlight can reduce heat entering through windows and the cooling needed to maintain comfort. The effect depends on the window, shading, weather and how cooling is operated.

Boundary of the claim

No fixed saving applies to every home. Compare cooling electricity under comparable weather, occupancy and comfort; include any extra lighting. In cold weather, blocking useful sun can increase heating demand.

What this simulation calculates

6 kWh before, 5 kWh after and 60 suitable days are hypothetical example inputs, not study results or a typical shading saving. Enter a locally assessed or appropriately measured comparison; no fixed percentage is applied.

Published coefficients and calculation references

  • Official guidance supports seasonal operation of existing shading. Its effect depends on orientation and climate; no heat-gain percentage is converted into a household electricity factor.

    Office Energy Checklist ↗

  1. Institutional guidance · U.S. Department of Energy, Federal Energy Management Program

    Office Energy Checklist

    Consulted section (original language): Office Energy Checklist, window-blind guidance for warm and winter months

    Consultation: Webpage / full text

  2. Institutional guidance · Australian Government, Department of Climate Change, Energy, the Environment and Water

    Windows

    Consulted section (original language): Window coverings; External shadings

    Consultation: Webpage / full text

  3. Institutional guidance · Australian Government, Your Home; Caitlin McGee, updated by Chris Reardon · 2013

    Shading

    Consulted section (original language): Understanding shading; Adjustable shading; Eastern and western elevations

    Consultation: Webpage / full text

Avoid counting the same change twice

Sources reviewed:

Report a data issue

Other possibilities in this area

At home
Miniature scene: Hang the same laundry in a ventilated room.Let a load of laundry air-dryMiniature scene: Cooling set to 26°C in this example.Find a comfortable, moderate cooling settingMiniature scene: A suitable 30°C wash in this example.Choose a cooler suitable wash
universalizable.At home / 01

Shade sunny windows before the room heats up

Miniature scene: Letting direct summer sun into the room. Miniature scene: Using existing shades before heat builds up.
Letting direct summer sun into the roomUsing existing shades before heat builds up

Why this can help

Blocking unwanted sunlight can reduce heat entering through windows and the cooling needed to maintain comfort. The effect depends on the window, shading, weather and how cooling is operated.

One possible next step

On a warm sunny day, adjust an existing shutter or shade before direct sun heats the room, keeping useful daylight and necessary cooling.

What changes the outcome

No fixed saving applies to every home. Compare cooling electricity under comparable weather, occupancy and comfort; include any extra lighting. In cold weather, blocking useful sun can increase heating demand.

universalizable.The action / 02

Your illustrative scenario

Over one year · with the assumptions below

You

60 kilowatt-hours of electricity less

You + 10 friends

660 kilowatt-hours of electricity less

1,000 participants

60,000 kilowatt-hours of electricity less

These are scenarios, not measured personal or collective savings. One separate household per participant. People sharing a home count it once, not once each.

Your inputs

Cooling electricity per comparable day before
6 kWh
Cooling electricity per comparable day after
5 kWh
Suitable comparable days per year
60

Calculation of the difference: (6 − 5) kWh × 60 = 60 kilowatt-hours of electricity

Calculation boundaries

Cooling electricity for the same home over complete comparable days: match weather, temperature setpoint, occupancy and comfort. Include extra lighting or ventilation fans. Unmatched meter readings do not establish an effect of this action; maintain necessary cooling.

6 kWh before, 5 kWh after and 60 suitable days are hypothetical example inputs, not study results or a typical shading saving. Enter a locally assessed or appropriately measured comparison; no fixed percentage is applied.

Sources and calculation references

  1. Office Energy ChecklistU.S. Department of Energy, Federal Energy Management Program
  2. WindowsAustralian Government, Department of Climate Change, Energy, the Environment and Water
  3. ShadingAustralian Government, Your Home; Caitlin McGee, updated by Chris Reardon · 2013

Read the method: universalizable.com/en/method/ · One sheet · print double-sided, long-edge binding

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