Clear 3M Thinsulate™ low-E film, professionally fitted to your existing windows. Warmer rooms in winter, cooler in summer, with no building work.
Windows are one of the biggest sources of heat loss in any building, and with heating bills where they are, more people are looking for a way to stop paying to heat the street. Insulating window film is a clear, permanent film fitted to the inside of your glass that reflects warmth back into the room. We fit 3M Thinsulate™ Climate Control window film, alongside other quality films to suit every budget.
A low-E coating reflects radiator heat back into the room instead of losing it through the glass.
3M's lab tests showed the U-value of single glazing cut by around 40%, and double glazing by over 20%.*
Lets through around 74% of visible light on single glazing, so rooms stay bright.*
Rejects up to 49% of the sun's total heat energy, so it earns its keep all year.*
Helps protect floors, furniture and curtains from sun damage.
Fitted to your existing windows, usually in a single visit, and the windows open as normal.
*Figures from 3M’s product bulletin for Thinsulate™ Window Film Climate Control 75, measured to EN 410 on clear glass in laboratory conditions. 3M gives them as illustrative values. Results on your windows will depend on the glass, frames and building.
In winter, most of the heat you lose through a window is radiant heat from your radiators and the warm room passing out through the glass. 3M Thinsulate has a microscopically thin, multi-layer low-emissivity (low-E) coating that reflects that heat back into the room, much like the coating on modern energy-efficient double glazing. In summer it works the other way, rejecting a large share of the sun’s heat before it builds up indoors.
Because it’s bonded to the inside of the glass, it doesn’t need edge sealing, doesn’t change how your windows look from outside, and can be fitted in the middle of winter at normal room temperatures.
| DIY shrink kit | 3M Thinsulate film | New windows | |
|---|---|---|---|
| How long it lasts | One winter | Many years | Decades |
| Can you open the window? | No | Yes | Yes |
| Looks | Plastic sheet over the frame | Virtually invisible | New |
| Helps in summer? | No | Yes | Depends on the glass |
| Disruption | DIY | Usually one visit, no mess | Building work |
| Listed or period homes | Yes | Yes | Often not allowed |
Insulating film isn’t right for every window, and we’d rather tell you than fit the wrong thing. 3M doesn’t recommend it for very humid rooms such as bathrooms, and seafront properties and opening windows in full sun need checking. We look at the glass type, condition and position of every pane before recommending a film, and if a different film suits better, we’ll say so. Every installation comes with our 12-month workmanship guarantee.
We fit insulating window film across Sussex, Kent, Surrey and London, from our base in Bexhill-on-Sea.
Yes, if it's the right kind. A professional low-E film such as 3M Thinsulate has a microscopically thin metal coating that reflects heat from your radiators back into the room instead of letting it escape through the glass. In 3M's own laboratory tests it reduced the U-value (heat loss) of single glazing by around 40% and of double glazing by over 20%. Real-world results depend on your windows, frames and draughts, which we look at during the survey.
DIY kits are plastic sheets taped to the frame and shrunk tight with a hairdryer to trap a pocket of air. They're cheap, but they're temporary, you can't open the window, and they usually come down in spring. 3M Thinsulate is a permanent, optically clear film bonded directly to the glass. You won't notice it's there, the windows open as normal, and it works all year round.
Hardly. In 3M's tests Thinsulate CC75 lets through around 74% of visible light on single glazing and around 66% on double glazing, so it looks virtually clear. A slightly tinted version is also available if you'd like some glare control too.
Yes. As well as keeping heat in during winter, 3M's figures show it rejects up to 49% of the sun's total heat energy, so rooms stay cooler in summer. It also blocks fading UV.
Yes, it's designed for single and double glazing. We check the type of glass and the size and position of each pane first, because some sealed units and glass types need a different film to avoid thermal stress.
It's a fraction of the cost of replacement windows, there's no building work or mess, and it's often the only practical option for period properties, listed buildings or conservation areas where you can't change the windows. If your frames are rotten or the seals have failed, new windows may be the better answer, and we'll tell you honestly.
3M doesn't recommend it for very humid rooms such as bathrooms, where it can increase condensation, or for opening windows that face full sun when they're open. Seafront properties need extra care because of salt air. That's why we always survey before we quote, and if another film suits better we'll say so.
Yes. It can be fitted at room temperatures from 4°C upwards, so winter fitting is no problem. It takes up to around 30 days to cure fully, but it starts working straight away.
Call us on 01424 559026, send a few photos on WhatsApp, or request a quote online. Friendly, no-obligation advice from a specialist with 30+ years' experience.