It rains. A lot.
Over 1,100 mm of rainfall a year on average, and a maritime climate that keeps the air damp even when it's not actually raining. Humidity outdoors stays high - and that affects indoors too.
From the root cause of Britain's damp crisis to the technology we use to tackle it - everything you need to know about the Dryzen system.
It's not just bad luck. There are a few things about UK homes - old and new - that make condensation almost inevitable. Once you understand what's causing it, the fix makes a lot more sense.
Over 1,100 mm of rainfall a year on average, and a maritime climate that keeps the air damp even when it's not actually raining. Humidity outdoors stays high - and that affects indoors too.
Around 38% of UK homes predate 1945. Solid walls, minimal insulation, and ventilation designed for draughty rooms - not for sealed double-glazed living. It depends on your property, but older homes struggle most.
Cooking, showering, drying clothes, even breathing - a typical family generates up to 15 litres of water vapour a day. Without somewhere for it to go, it ends up on your walls and windows.
The push for energy efficiency - double glazing, draught-proofing, cavity wall insulation - was a good thing. But it also meant homes became much more airtight. Moisture that used to escape through gaps now stays inside.
Warm, moist air hits a cold surface - a window, a north-facing wall - and the moisture drops out as liquid water. That's your condensation. Simple physics, really. Just very annoying physics.
Mould spores are always present in the air. But they only grow when humidity stays above 60%. Most UK homes hit that - especially bedrooms and north-facing rooms - which is why the mould keeps coming back.
Two things working together: dehumidification removes excess moisture, and fresh air ventilation replaces stale air from outside. Here's how each part works.
The main unit is mounted in your loft. From there, insulated ducting runs to the central area or stairway only, and the unit works through the home from there. It pulls humid air in, strips out the moisture, and sends dry air back out - quietly, continuously, without you having to think about it.
Warm, humid air passes over cold refrigerant coils. Water vapour condenses on the coils and drains automatically - no emptying required.
Smart sensors monitor humidity levels. The system runs harder when needed and backs off when the home is dry - using only as much energy as required. The smart app, with temperature and humidity monitoring, is included (needs 2.4GHz Wi-Fi and internet access).
Treated dry air is returned from the central area or stairway via low-velocity vents - as quiet as a gentle breeze. Most homeowners forget it's even running.
Ducting draws warm, moist air from the central area or stairway
Water vapour condenses and drains automatically
Dehumidified air is gently rewarmed by the process
Returned from the central area or stairway via quiet vents
Dehumidification sorts the moisture. But the fresh air side does something different - it replaces stale indoor air with filtered air from outside, so the home feels less stuffy.
Incoming air passes through an activated carbon filter, helping to clean the air and reduce odours.
The system runs quietly in the background 24/7, with automatic boost for high-moisture events like showers and cooking.
Fresh air enters via a discreet external grille
The system allows for an adjustable ratio of fresh and recycled air. This lets you set the right balance of humidity removal and outside air. Both are dehumidified and filtered before entering the house.
Air filtered and odours reduced
Clean fresh air distributed through the home
Here's exactly what happens when you choose Dryzen - every step, clearly explained.
A Dryzen specialist visits your home at a time that suits you. We use professional equipment to measure humidity levels throughout, inspect problem areas, assess your loft and roof space, and listen to your concerns. We'll be honest about what we find.
Our engineers design a system specifically for your home - sizing the dehumidifier unit, planning ductwork routes, positioning vents for maximum effectiveness, and specifying the correct fresh air solution. You receive a clear, itemised quote with no hidden extras.
Our own installation engineers arrive with everything needed. Ductwork typically runs through the loft - keeping disruption to your living spaces minimal. We protect floors and furniture, work efficiently, and leave your home clean and tidy.
We test and calibrate your system before we leave - checking airflow, humidity sensors, and controls. We'll walk you through everything: how to adjust settings, what to expect in the first weeks, and how to contact us if you have any questions.
10 years of filters are included with your system, and they're a straightforward DIY change. Prefer we do it? Our £99 annual service covers the filter change plus a full system health check. Gold Pack members go further still, with the unit's performance guaranteed, including refrigerant re-gas or full replacement. Optional free remote monitoring of your home and your Dryzen unit, included with yearly Gold membership: we manage the humidity, monitor the unit’s performance and alert you if there are any issues.
Most customers notice improvements within the first few weeks. Here's a typical timeline.
Your system begins working immediately. The unit runs frequently in the initial period as it reduces existing high humidity levels throughout your home.
Condensation on windows and walls begins to reduce noticeably. Indoor air feels fresher and any musty smell starts to diminish. Humidity levels stabilise.
With humidity held consistently below 60%, mould has far less to grow on. It will not remove mould that is already there, so clean that off first.
Our free Healthy Home Humidity Guide explains the 40-60% healthy range, what humidity control can and cannot do, and how to monitor your own home. Fully referenced, with a calculator and printable cheat sheet.