Why You Really Get Window Condensation
And Why It’s Not Your Blinds or Shutters
Every winter, we receive worried messages like:
“My blinds are making my windows wet in the mornings” or
“I’ve had shutters fitted and now I’ve got condensation — what’s gone wrong?”
The truth is simple: window condensation isn’t caused by window coverings. It’s caused by humidity, temperature differences and everyday life. This post will walk you through what’s normal, what’s not and how to reduce moisture inside your home.
What Actually Causes Condensation?
Condensation occurs when warm, moist air meets a cold surface like your window glass. This is a natural process and doesn’t mean your windows are faulty or that your blinds/shutters are blocking airflow.
Your home can handle humidity up to a point. Once levels climb above 60–65%, moisture will settle on the coldest surfaces, usually the windows.
Moisture is created by everyday activities
- Drying washing inside
- Shower steam
- Cooking
- Pets
- Even breathing
- Tight-sealed homes with low ventilation
- Lack of trickle vents or blocked vents
Why Homes in Poole & Dorset Get More Condensation
As a coastal area, our outdoor humidity is naturally higher, which pushes indoor humidity up too. This makes condensation more common and more noticeable.
- Ideal indoor humidity: 50–55%
- Borderline: 60%
- Too high: 65%+
With a good dehumidifier, most homes sit in the ideal range and the problem disappears.
Simple Ways to Reduce Condensation
1. Use Your Trickle Vents (All Year Round)
If your windows have trickle vents, they should stay open. They allow moist air to escape without losing heat. Many people close them thinking they save energy, but they actually make the home feel colder and damper.
2. Ventilate Moisture Hotspots
- Open a bathroom window after showers
- Use extractor fans when cooking
- Don’t block vents
- Don’t permanently seal bathroom or kitchen airflow
3. Dry Clothes with a Dehumidifier Running
Drying on radiators releases litres of water into the air. A compact dehumidifier in the same room solves the problem.
4. Understand the Difference Between Condensation & Blown Seals
Wipe-off moisture = Internal condensation: normal humidity
Moisture between the panes = Blown glazing units: need repair or replacement
Blown units are a job for a window company, not blinds or shutters – we have used Precision Repairs for not only our home but suggested them to many of our customers.
A Note on Our Honest Approach
At Ashley Blinds, we believe in being upfront and educating our customers. Blinds and shutters do not cause window condensation; they simply sit in front of a surface that’s reacting to humidity.
We also work closely with trusted local window repair and installation specialists. If you ever suspect blown seals or genuine glazing issues, we’re happy to point you to someone reliable.
If You’re Unsure, We’re Always Happy to Check
During your measuring appointment or installation, we can give you honest, friendly advice about what’s happening on your windows and whether it’s normal or something that needs a glazing expert. Sometimes the simplest changes make the biggest difference.
Got a question? We have the answer
Why Choose Ashley Blinds?
We’re a second-generation family business based in Poole, working across Dorset and Hampshire. With over 25 years’ experience, we pride ourselves on honest advice, quality products and personal service.
We don’t just sell blinds, we help you find the right solution for your home and lifestyle, so it looks good and works beautifully all year round.


