How To Stop Your Home Turning Into A Greenhouse This Summer

The first really warm day of the year tends to expose every weakness in a home. Rooms that felt bright and welcoming in spring suddenly become uncomfortably hot by mid-afternoon. Conservatories become saunas. South-facing bedrooms feel impossible to cool down.

Skylights that seemed like a brilliant idea in January start making you question every design decision you've ever made.

The problem is that glass is wonderful at letting sunlight in, but not particularly good at stopping heat from following along. Once that solar heat enters your home, it has a habit of hanging around.

While air conditioning can help, it often makes more sense to stop the heat from entering in the first place. That is where window treatments become less about decoration and more about comfort.

Not All Window Treatments Are Created Equal

A surprising number of window treatments are chosen almost entirely for their appearance. There is nothing wrong with that, of course. Curtains, blinds and shutters all contribute to the overall look of a room. The trouble starts when people assume every window treatment performs the same function.

A beautiful sheer curtain can soften daylight and provide privacy while doing very little to reduce heat. Likewise, a lightweight decorative blind may look great but have a limited impact during a heatwave. If keeping a room cool is a priority, it is worth paying attention to performance rather than appearance alone.

Skylights Can Be The Biggest Culprit

Large windows tend to get all the blame, but skylights are often responsible for a surprising amount of unwanted heat gain. Because they sit overhead, they can be exposed to direct sunlight for long periods throughout the day. The result is a constant stream of warmth entering the room below.

I discovered this in my own home. The skylight brings in fantastic natural light for most of the year, and I would not want to lose it. During summer, however, it had the potential to turn part of the house into a greenhouse.

Installing a plissé blind made a significant difference. The room still receives daylight, but without feeling as though someone has left a giant magnifying glass pointing at the ceiling.

Skylight in my kitchen

It remains one of those practical upgrades that does not receive much attention on social media but earns its keep every single summer.

Why Plissé Blinds Work So Well

Plissé blinds are particularly useful for roof windows and skylights because they can be fitted neatly within the frame and remain in place at different angles. Unlike some other blind styles, they are designed to work well on windows that are not vertical.

Depending on the fabric chosen, they can filter light, reduce glare and help limit the amount of solar heat entering the room. They also tend to have a clean, unobtrusive appearance, which suits both traditional and contemporary interiors.

Plissé blinds on my folding doors.

If I were doing it again, I would probably connect mine to a wall switch rather than relying on a remote control. The blind itself has been brilliant. Hunting for the remote when the sun suddenly appears is slightly less brilliant.

Cellular Blinds Add An Extra Layer Of Insulation

If heat control is your main concern, cellular blinds are worth considering. Sometimes called honeycomb blinds, these designs contain air pockets within their structure. Those pockets create an insulating barrier between the glass and the room.

During summer, this helps reduce heat transfer from the window into the interior. During winter, it can also help retain warmth. It is one of the few window treatments that actively contributes to comfort throughout the year rather than only solving a seasonal problem.

External Shading Often Performs Best

There is one important fact that many people do not realise. Once sunlight has passed through the glass, some heat has already entered the home. This means external shading solutions often outperform internal ones.

Awnings, pergolas, shutters and external blinds stop a portion of the sun's energy before it reaches the window itself. They are not always practical or suitable for every property, but where possible, they can be extremely effective.

That does not mean internal blinds are pointless. Far from it. Internal window treatments still play a valuable role, especially when external options are not possible. It simply helps to understand where each solution sits on the scale of effectiveness.

Sheers Are Beautiful But They Are Not A Cooling Strategy

There seems to be a persistent belief that adding sheer curtains automatically makes a room cooler. Unfortunately, physics remains stubbornly unimpressed by interior design trends.

Sheers are fantastic for diffusing harsh sunlight, improving privacy and creating a softer atmosphere. They can make a room feel visually cooler because the light becomes less intense. What they generally do not do is stop significant amounts of heat from entering the space.

That is not a criticism. It simply means they should be viewed as part of a window treatment strategy rather than the entire solution.

My living room.

I have sheer curtains in my own living room and wouldn't be without them. They soften the daylight beautifully and make the room feel much less stark. As lovely as they are, though, they do very little to stop summer heat. The original wooden shutters in our house are far more effective. When the sun is really beating down, it's the shutters doing the heavy lifting, not the sheers.

The Goal Is Comfort, Not Darkness

Many people approach summer heat control as though they must choose between a bright room and a cool room. In reality, the best solutions strike a balance between the two.

A well-chosen blind, shutter or shade allows you to enjoy natural daylight without spending the entire afternoon melting into the sofa. The aim is not to turn your home into a cave. It is to prevent it from becoming a greenhouse.

In my case, that meant adding a plissé blind to a skylight that was doing a little too good a job of bringing the outdoors in.