Curtain rail or roller blind for summer: what suits a sun-facing window

How each solution actually keeps the sun out

A roller blind fitted close to the glass stops heat before it spreads into the room, because it sits in the gap between window and curtain and traps a layer of air against the pane. A light-coloured or reflective blind fabric bounces a good share of the sun back out rather than letting it heat the room air. This is the more effective option on a window that gets direct afternoon sun for hours at a stretch.

A curtain rail with a light linen or cotton fabric works differently: it diffuses the light rather than blocking it, so the room stays bright but the direct glare and some of the heat are cut. It will not hold back midday sun on a west-facing balcony door the way a blind does, but it moves air, looks softer, and suits a living room where you still want daylight rather than a darkened box.

Some households run both: a blind for the hot hours and curtains for the evening look. That costs more and takes two fittings, but on a genuinely difficult window, such as a south-facing kitchen with no shading trees outside, it is often the only combination that keeps the room comfortable without air conditioning.

Which window needs which

A south- or west-facing window with direct sun for several hours a day, especially one on a top floor of a panel block where the roof heats the flat as well, generally does better with a roller blind. The same goes for a balcony door, where a blind's clean vertical drop suits the frame better than curtains that need width either side to draw back.

A north- or east-facing window, or one shaded by a building or tree opposite, gets less direct heat and can usually manage with curtains alone. A living room where you want to keep the space feeling open in the evening is also better served by curtains, since a blind either sits fully up or fully down, while curtains can be drawn partway.

Wooden houses in Kalamaja or Nõmme with deep window reveals often take a roller blind well inside the reveal, out of sight when raised, and a rail mounted just above for curtains on top. New developments with large glazed walls and no external shading are the cases where a blind earns its keep the most.

The fitting difference: what is simple and what takes more work

A curtain rail is the simpler of the two in most cases: it is a straight bar or track fixed to the wall or ceiling above the window with a handful of brackets, and on a solid wall it is a job of an hour or so. On a panel block wall it needs the right wall plugs for concrete, and getting the bracket spacing right so the rail does not sag in the middle under a heavy fabric takes a steady hand.

A roller blind, if it is the kind fitted inside the window reveal with cassette brackets, needs more precise measurement, because a few millimetres out and the blind either will not clear the frame or leaves gaps that let light through the sides. Blinds fitted outside the reveal, onto the wall or ceiling, are closer to a curtain rail in difficulty.

Fitting a curtain rail through us starts from 35 € per job, which for a standard window is a straightforward call-out rather than an hourly job. A roller blind, especially several across a flat with different window sizes, is usually quoted after a look at the windows or a set of measurements and photos.

• Curtain rail on a solid wall: roughly an hour, minimal tools
• Curtain rail on panel-block concrete: needs the correct wall plugs
• Roller blind in the reveal: precise measurement, tighter tolerances
• Roller blind on the wall or ceiling: closer to rail-fitting difficulty
• Multiple windows, mixed sizes: worth a fixed quote rather than guessing

What you can do yourself and when it is worth calling in help

Putting up a straight curtain rail on a solid wall with a spirit level, a drill and the right wall plugs is a reasonable weekend job for most people, and a false economy only if the wall is concrete and the plugs give way under the weight of a heavy curtain months later. A cassette roller blind measured and cut to size by the supplier is also fittable by hand if the brackets line up with the window frame as sold.

Where it is worth paying for the job is a heavy rail spanning a wide window or a bay, several blinds across a flat where consistent alignment matters, or a wall where you are not sure whether you are dealing with solid concrete, a stud partition, or old plaster over brick, which changes which fixings will actually hold.

If you are putting up shelving or a mirror at the same time as the curtains, for instance in a bedroom being reorganised for summer, that is priced by the hour from 39 €, and doing the rail and the shelf in the same visit usually costs less in total than two separate call-outs.