M.J. Blinds — home 01942 882 181 Book a free visit

Energy-saving blind fabrics

A coating on the back of the fabric reflects summer heat out and slows winter heat escaping. Here is what that does, and what it does not.

Can a blind really save you money?

Some of it, yes, and we will be straight with you about how much.

Many of the fabrics we make blinds from carry a coating on the reverse side, the side facing out towards the glass. That one coating does two jobs. In summer it reflects sunlight and heat back outwards before the room ever gets it. In winter it works the other way round, holding warmth in so the glass is not steadily pulling it out of the room.

Glass is the coldest surface in most rooms, so anything that slows heat crossing it is doing useful work. This is not loft insulation and it is not a new boiler. It is a real, noticeable difference in the room you are actually sitting in.

Blinds fitted across a conservatory window
A conservatory is where you notice it most, in both directions.

One coating, two jobs

The performance is on the back of the fabric, not the front. You never see it. You only notice the room.

In summer

The coating faces the glass, so the sun's heat meets it before it gets far into the room and a good part of it is reflected straight back out. That is the difference between a conservatory you can use through a July afternoon and one that feels like a sauna by lunchtime.

In winter

The same coating slows the heat leaving the room through the glass, so the room holds its warmth a while longer after the heating goes off. It takes the edge off that fridge feeling you get in a glazed room on a cold morning.

Where it works hardest

Behind a Perfect Fit frame. Perfect Fit holds the fabric tight against the pane rather than leaving a gap for air to circulate through, so the coated fabric acts as a proper extra barrier instead of a curtain hanging nearby.

Pleated blinds in a conservatory roof are the other big one, because the roof is where most of the heat arrives and leaves.

Will it cut my heating bill?

You will not find a percentage on this page, and here is the reason.

Blind firms quote a specific percentage off your heating bill. Those figures come from suppliers' own studies, and we are not willing to repeat a number we cannot show you the source for. If a supplier ever puts the working in front of us, the figure will go on this page with the source printed next to it. Until then, no number.

What we will tell you is this. A thermal-backed blind will make a cold front room noticeably less cold in January, and a conservatory bearable in July. You will feel it in the room, which is the part that matters day to day.

Whether it shows up as pounds on a bill depends on your house, your glazing and how you heat it. Nobody selling you a blind can honestly tell you otherwise.

SPF, SPC, ESP and ASC

Four performance ranges, all with backings that do the reflecting. There is plenty of colour to pick from and a proper spread of styles, so a fabric that works does not have to be a fabric you settle for.

We are not going to print definitions of the four here that we cannot stand behind. Simon will hold them side by side at your window and tell you which one suits it. A south-facing conservatory roof and a north-facing bedroom want different things from a fabric.

Worth knowing

One of our principal suppliers grades its fabrics on three levels of energy efficiency, ER1 through to ER3, with ER3 at the top of that scale.

It is a useful shorthand when you are comparing two fabrics you like equally. Ask for the grading when you choose, and ask what it is being compared against. A grade only means something next to the thing it is measured from.

Ask Simon which range is which. The difference between them matters more than the letters do. You can also see the fabric ranges.

Questions about energy-saving blinds

If yours is not here, ring and ask. Two minutes on the phone beats guessing.

Do blinds actually help with heat loss?

Yes, to a point. Glass is the coldest surface in most rooms, and a thermal-backed blind slows the heat crossing it. It is a genuine improvement you can feel in the room. It is not a substitute for insulation or for double glazing, and we would not pretend it is.

Which blinds work best for this?

Perfect Fit, because the frame holds the fabric tight against the pane rather than leaving a gap for air to circulate through. Pleated blinds in a conservatory roof are the other big one, because the roof is where most of the heat arrives and leaves.

Do energy-saving fabrics come in normal colours?

Yes. The SPF, SPC, ESP and ASC ranges come in a large colour palette with a proper choice of styles, so you are not picking between a fabric that performs and a fabric you actually like.

Will it stop my conservatory overheating in summer?

It will take the worst off it and make the room usable for more of the day. It will not make a south-facing conservatory cool in August. A blind is not air conditioning, and we would rather tell you that before you buy than after.

Rather just talk to someone?

Give us a ring and we will come to you with the samples, measure up and write the price down while we are there. Evenings and weekends are no bother.