Condensation
Condensation on the Inside of Windows: Causes and How to Stop It
Why windows sweat on the inside in cold weather, what the moisture tells you, and the steps that stop it: lower humidity, more air flow, warmer glass.
Independent technical guide
Condensation, damp or mold at home? Find the cause first.
Clear answers about humidity in your home: where the moisture comes from, what humidity is healthy, which ventilation or dehumidifier actually helps and when to call a professional. We don’t sell anything.
For homes with foggy windows, damp walls, musty smells or mold that keeps coming back.
Start here
What is happening in your home?
Most damp problems come down to three questions: where the moisture comes from, why it stays, and what removes it without wasting energy.
Condensation
Wet windows every morning?
Where the water comes from, what indoor humidity is healthy and which changes stop condensation for good.
EPA: keep indoor humidity below 60%, ideally 30–50%
Stop condensation
Mold
Mold keeps coming back?
How to clean small areas safely, find the moisture source behind it and know when the job is too big to do yourself.
Fix the moisture first, or the mold returns
Deal with mold
Dehumidifiers
Do you need a dehumidifier?
When a dehumidifier helps, what capacity to look for, what it costs to run and when ventilation is the better fix.
Compare: capacity, energy use and drainage
Choose a dehumidifier
Guides by topic
Guides to humidity in the home
Each section covers one part of the problem, from spotting the cause to choosing a fix that lasts.
01
Condensation
Wet windows, damp walls and cold corners: why moisture condenses and how to keep surfaces dry.
02
Mold
Cleaning small areas safely, finding the moisture source and knowing when to call a professional.
04
Dehumidifiers
Capacity, running costs, compressor or desiccant, and when a dehumidifier is not the answer.
05
Hard water and limescale
Removing scale from faucets, showers and appliances, and when a water softener makes sense.
Latest guides
Independence and method
Independent information, no sales pressure
Official sources
Every figure links to the public health, environmental or building agency it comes from.
Causes before products
We explain why moisture builds up before suggesting any device, because the cheapest fix is often free.
Rated vs. real performance
We separate manufacturers’ test figures from what you can expect in a real home.
No commercial interests
We don’t sell devices or treatments, we don’t take commissions and we don’t ask for your data.
Our editorial commitment