The useful answerStart with the window that creates the problem and the hours when it happens. Window coverings can affect comfort and energy use, but their benefit depends on the window, climate, installation and how you use them.

Name the problem at the window

A room can be difficult to use because sunlight hits a screen, because privacy is poor, or because it becomes uncomfortable in the afternoon. Those are related concerns, but the best solution may differ. A shade that makes a room darker is not automatically the best choice for reducing energy use.

For two or three ordinary days, note the troublesome window, the time sunlight reaches it, where people sit and what existing coverings are doing. This small observation sheet helps you compare products against a specific need instead of a general promise of a cooler home.

Match the claim to the product

Berkeley Lab’s window research explains that attachment performance depends on factors including climate, orientation, mounting and occupant use. Results from a particular window-and-covering combination should not be assumed to apply unchanged to another apartment.

Ask whether the product information describes glare reduction, insulation, solar control or all three. Check what testing supports the claim and which installation it assumes. If a listing says it can save a percentage of energy, find out whether that means heat through a window, cooling energy or the entire household bill.

Check fit and permission before ordering

Make a short purchase note that can travel with you to the store:

  • The opening measurements and whether mounting is inside or outside the recess.
  • The support or existing hardware the product requires.
  • Space for handles, opening the window and operating existing equipment.
  • The landlord’s requirements for drilling, adhesives or changes to glazing.
  • The full price, including fittings, delivery and any removal work.

Use the chosen product’s instructions for compatibility. Do not cover appliance air paths or required exits. A removable attachment still needs to be suitable for the surface and the way that window is used.

Try an operating routine before replacing everything

Where appropriate, start with the coverings already present. Try a repeatable schedule for the troublesome window and record glare, comfort and whether you needed extra lighting. Keep the change manageable; a solution that depends on constant attention may not suit your day.

A sample log could read: “West window, 3–6 p.m., existing blind closed, less screen glare, desk lamp needed.” That is useful feedback without inventing an energy saving. If you also collect consumption readings, compare similar conditions and acknowledge differences in weather or occupancy.

Review the result after several days. Keep what solves the original problem, and purchase a replacement only when you can explain what it must improve. For a broader room plan, see cooling a rental without renovating.

Choose your next step

Continue with the question that matches your next decision:

Shopping options for this guide

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NICETOWN lined blackout curtains (grey, two 52 x 63 inch panels)

An option for a window where daylight or privacy is the problem. The selected grey set contains two lined polyester panels, each 52 inches wide and 63 inches long, with grommet tops. Measure the window and compare the required overlap before choosing a size.

Before buying: Check rod diameter, support capacity and the selected size before ordering; get permission for new fittings in a rental. Keep ventilation, heaters and required exits clear. Follow the current care label. Darkening the room does not establish a specific temperature drop or electricity saving; these depend on the window, installation and use.

View NICETOWN lined blackout curtains (grey, two 52 x 63 inch panels) at Amazon.com (opens in a new tab)

3M Indoor Window Insulator Kit (five-window pack)

An indoor film-and-tape option for suitable windows where seasonal coverage fits your routine. The selected listing advertises five 3 × 5 ft windows; confirm actual attachment dimensions and a cutting plan.

Before buying: Read the supplied directions and obtain rental permission where required. 3M says not to apply the kit tape to painted walls. Check finish condition and preserve required ventilation and emergency access. It is not a repair for damaged windows or a guarantee of heating savings.

View 3M Indoor Window Insulator Kit (five-window pack) at Amazon.com (opens in a new tab)

These are shopping options, not hands-on test results. Check the retailer for current specifications, price and availability.

Sources & further reading

Numerical examples are illustrative unless explicitly described as measured. This guide does not claim hands-on product testing. Read the methodology and editorial disclosure.