The Complete Guide to Saving Energy with Window Treatments

The Problem: Your Windows Are Energy Leaks

Windows are the weak point in your home's insulation. Even modern double-pane windows let heat escape in winter and enter in summer. The Department of Energy estimates that 25-30% of home heating and cooling energy use is due to heat transfer through windows.

The good news: the right window treatments can significantly reduce this energy loss.

How Window Treatments Save Energy

In Winter: Reducing Heat Loss

When it's cold outside, heat escapes through your windows in three ways:

• Conduction (heat transfers through the glass)
• Radiation (warm surfaces radiate heat toward cold surfaces)
• Air leakage (gaps around the window)

Window treatments create an insulating barrier that slows all three types of heat loss.

In Summer: Blocking Solar Heat Gain

When the sun shines through your windows, it heats up everything inside—furniture, floors, and the air itself. This forces your AC to work harder.

Window treatments that block or reflect sunlight can reduce this solar heat gain dramatically.

The Best Window Treatments for Energy Efficiency

1. Honeycomb/Cellular Shades: The Energy Champions

Honeycomb shades trap air in their cellular pockets, creating an insulating barrier. They're one of the most effective options for energy efficiency—see our honeycomb shades page for more detail.

The numbers:

• Single cell: R-value around 2
• Double cell: R-value around 3-4
• The extra trapped-air layer can meaningfully reduce heat loss versus a bare window

Best for: Any room where you want maximum energy efficiency, especially rooms with multiple windows or poor insulation.

2. Insulated Drapes: Old School but Effective

Heavy, lined drapes provide excellent insulation when closed. The key is the lining—thermal or blackout lining makes a significant difference.

Tips for maximum efficiency:

• Drapes should touch the floor or windowsill
• Mount them close to the window
• Use a cornice or valance to block air from escaping at the top
• Keep them closed during the hottest/coldest parts of the day

Best for: Living rooms, bedrooms, and formal spaces where you want both energy efficiency and style.

3. Solar Shades: Heat Blockers for Sunny Rooms

Solar shades are specifically designed to block UV rays and reduce heat gain while maintaining your view. They come in different openness factors (1% to 14%)—lower numbers block more light and heat.

General ranges (vary by product and openness factor):

• Block most UV rays
• Reduce glare significantly
• Can block a substantial portion of solar heat

Best for: South and west-facing windows, home offices, any room where you want to preserve the view while reducing heat.

4. Plantation Shutters: Solid and Durable

Well-fitted shutters provide decent insulation and excellent control over light and airflow. The solid construction blocks drafts better than fabric options.

Best for: Homeowners who want a permanent, architectural solution that also adds home value.

Room-by-Room Strategy

South-Facing Windows

These get the most sun. Prioritize solar-blocking options or exterior solutions like awnings.

East and West-Facing Windows

Morning sun (east) and afternoon sun (west) can be intense. Adjustable options like zebra blinds let you control light throughout the day.

North-Facing Windows

These lose heat in winter but don't gain much in summer. Focus on insulation (honeycomb shades) rather than solar blocking.

Maximizing Your Savings

1. Close blinds when the sun hits them directly – This alone can cut cooling costs significantly

2. Open them on sunny winter days – Let free solar heat in

3. Close everything at night – Windows lose the most heat after dark

4. Ensure a tight fit – Gaps around the edges reduce effectiveness

5. Layer treatments – Combine sheer curtains with blinds for flexibility

The ROI of Energy-Efficient Window Treatments

How long until window treatments pay for themselves?

It depends on:

• Your current energy costs
• How many windows you're treating
• Your climate
• The efficiency of the products you choose

The payback period varies too much by home, climate, and energy costs to give a single number—ask us for a personalized estimate based on your windows and current bills.

Get a Professional Assessment

We can look at your specific windows, their orientation, and your energy bills to recommend the most cost-effective solutions. Sometimes one high-performance treatment on a south-facing window will save you more than covering every window with budget options.