The System

Climain-PartsThe System

The Climawin system consists of a window with two integrated frames of glass, an intelligent (electronically regulated) valve, room and zone sensors, optional integrated blinds and an inbuilt photovoltaic power system (optional from 2017 on).

Air is drawn through the valve at the bottom of the frames through the cavity between the frames where it is pre-warmed by heat escaping through the glass. The air flow is modulated in response to room and outside conditions detected by Climawins sensors on the window (inside, centre  and outside) and ceilings. These signal the windows and extraction system  (wirelessly) reacting to pre-set and user-specific programmes.

A bypass valve that allows air in directly from outside during hot months complete the system for cool and temperate climates.

Heat Recovery Ventilation – the natural healthy way

Climawin is a combination of a window and a fresh air ventilation system and so can be thought of as a natural or passive heat recovery ventilation system. It works in a different way to mechanical heat recovery ventilation in that the heat recovered originates in heat being lost through conduction through the glass (not convection), in that ducts and fans are avoided and the air is brought in directly from outside (but pre-warmed) so is more comfortable.

Climawin relies on a constant steady air flow (the slower, the more heat is recovered) through it to both provide a building regulation mandated level of fresh air, and in turn to pre-heat that air. 2.5 to 4 litres per second (4 Pascals +) is assumed. Many buildings already have a constant low level extraction system removing air from wet rooms and this can be enough to draw the air in. On buildings that do not have active ventilation of kitchen and bathrooms, a simple off-the-shelf ultra low energy (or PV powered) extraction system may have to be fitted. Climawin controls can actually signal the extractor to come on when air is needed (in and thus must be extracted form the room. A passive stack system may in some circumstances work also – for even more energy improvements.



“How many Climawin windows do I need in my home or building?” is a common question. The answer is that it depends on the local building regulations, use of the rooms, width and height of your windows (wider windows fit more valves) and to some extent, wind patterns and air-tightness of the building. Climawin uses a bespoke computer tool to estimate the number of windows you need and the benefits you could expect to get. Email us to have us do this for you.

Self Cooling- Daylight Without Heat

For warm climates the Climawin system with integrated blinds can ensure that daylight reaches inside the building but without bringing unwanted heat with it. A outward facing vent at the window head directs warm air out rather than so preventing the windows heating up. If blinds are deployed daylight can reflect into the room but with far less heat gain then in traditional windows. Building users in warmer climates who are generally faced with the false choice of either opting for daylighting but needing electricity to remove the heat, or deploying shutters to keep light (and heat) out but then needing electricity to light the space will have another option with Climawin. Significant energy normally spent on artificial light in these circumstances can thus be saved.



Installation – Simplicity Itself

Climawin can be installed without rewiring so is ideally suited to retrofit of existing buildings.

The window valves and blinds are powered by solar photovoltaic cells on the frames while the zone sensors (detecting heat and co2 in the room), which are installed on the ceiling of the room, communicate to the windows wirelessly. This means that in a project where the client only intends to replace the windows, other trades do not need to be involved and construction is far cleaner and quicker.

The system is also highly effective on new build projects.

Climawin sensors and controllers are capable of integrating to more sophisticated building management systems if required.


The system comes with full user control. A small dashboard panel with buttons to control blind position and rotation and to shut off the window processes for maintenance or at a time when the user wishes to open the windows. The clients preferences regarding desired indoor temperature, humidity etc will be set by the installer etc system.  An IT interface usable on PC or smart phone is also available.


Climawin SmartPhone Control