Does low-iron glass reduce solar heat gain?

Not meaningfully on its own. Low-iron glass is about colour clarity, removing the standard green tint, not about controlling heat. If overheating is the concern, you need a solar control coating, which can be combined with low-iron glass if both are wanted.

Is solar control glass tinted?

Most solar control glass has a very subtle tint or slight reflectivity, though modern coatings are designed to be as neutral as possible. If a completely clear, untinted appearance matters, ask to see a sample panel before specifying.

Which is more expensive, solar control or low-iron glass?

Both add a modest premium over standard clear double glazing, and combining them costs more than either alone. The right spend depends on which problem, heat or colour clarity, actually affects your project.

Do I need low-iron glass on ordinary windows?

Usually not. The green tint of standard glass is barely noticeable on typical window-sized panes. Low-iron glass earns its cost on large sliding doors, glass balustrades and feature glazing where the tint becomes visible along thick edges or large areas.

Product Comparisons

Solar Control Glass vs Low-Iron Glass

Solar control glass and low-iron glass are often asked about as if they solve the same problem. They solve two different ones, and can often be combined.

3 min read

This comparison comes up because both products are pitched around "better glass" and "clarity", and it is easy to assume you are choosing between them. In reality solar control glass manages heat and glare, while low-iron glass improves colour clarity by removing the green tint of standard float glass. Understanding the difference stops you paying for the wrong upgrade.

What each actually does

Solar control glass uses a coating (often a subtle metallic or reflective layer) to reduce the g-value, the fraction of solar energy that passes through the glass as heat. It is chosen to reduce overheating in large south or west-facing glazing, particularly in extensions and conservatories, without needing blinds or external shading.

Low-iron glass simply has a lower iron oxide content than standard float glass, which removes the faint green cast visible through standard glass, especially noticeable on large panes and edges. It is chosen for colour accuracy, for example where glazing sits close to a specific paint colour or where large sliding doors would otherwise show a visible green tinge along the glass edge.

Side by side

	Solar control glass	Low-iron glass
Primary purpose	Reduce solar heat gain and glare	Remove green tint, improve clarity
Best used for	South/west-facing extensions, large glazing prone to overheating	Feature glazing, balustrades, matching precise colours
Effect on U-value	Neutral to slightly improved	No meaningful effect
Visual effect	Can add a very slight tint or reflectivity	Crisper, more neutral colour rendering
Can be combined	Yes, with low-iron as the base glass	Yes, with a solar control coating added

Can you combine them

Yes, and this is common on high-specification projects: a low-iron base glass gives the clearest possible colour rendering, with a solar control coating applied to manage heat gain on exposed elevations. This costs more than either option alone but gives you both benefits where a large, prominent glazed area genuinely needs it.

Which should you choose

Choose solar control glass if a room already overheats, or will clearly face strong, prolonged sun, and you want to avoid relying on blinds. Choose low-iron glass if you have large feature glazing, glass balustrades or a specific colour scheme where the standard green tint would be genuinely noticeable and unwelcome.

Do not buy solar control glass expecting improved clarity, it is not what it is designed for, and do not buy low-iron glass expecting a cooler room in summer, it will not meaningfully reduce solar gain on its own. If you are not sure which problem you actually have, tell us the room, its aspect, and what is bothering you about it, rather than naming a glass type, and we will specify accordingly.