Home Efficiency – Why Windows & Doors Matter

In the UK, 15% to 30% of a home’s heat is typically lost through inefficient or poorly fitted windows and doors. In older properties with single glazing or noticeable draughts, that figure can climb even higher, reaching 20% to 25%. With energy prices still a concern for many households, ensuring your home is performing at its best is more important than ever.

Fortunately, there are several effective steps homeowners can take to improve energy efficiency and reduce heat loss:

• Insulate your loft and walls – Loft insulation should ideally be around 270mm thick to prevent warm air escaping through the roof.
• Draught-proof your property – Sealing gaps around doors, windows, and letterboxes can make a significant difference to comfort and heating costs.
• Use thick, lined curtains – These not only enhance the look of a room but also help retain heat during colder months.

How CN Glass Can Help

Based in Banbury, Oxfordshire, CN Glass specialises in upgrading windows and doors to improve home efficiency. As a general guide, windows typically need replacing every 15–25 years, and doors every 30–35 years, or sooner if the glass units have failed. If you’re unsure about the condition of your glazing, take a look at our helpful guide: CN Glass Winter Home Check-List | CN Glass Ltd.

While failed sealed units may seem like a minor issue during summer, they become a major source of heat loss in winter. Broken or misted double glazing allows valuable energy to escape, forcing your heating system to work harder and increasing your bills.

At CN Glass, we manufacture our Krypton or Argon-filled double and triple glazed units in-house at our Oxfordshire facility. With low U-values and high-performance thermal properties, our units are designed to keep your home warmer for longer. Every installation is carried out by our own experienced glaziers, and all units come with a 10-year guarantee.

Choosing the right manufacturer for your residential or commercial glazing ensures better performance, improved cost-efficiency, and a longer lifespan for your investment.

Why Choose CN Glass?

When you purchase windows and doors from CN Glass, you benefit from:

1. In-house manufacturing of double and triple glazed units to BS EN1279 (Parts 2 & 3), ensuring excellent moisture resistance, gas retention, and durability.
2. A complete installation service carried out by our own trained fitters and glaziers.
3. A 10-year warranty on all residential windows and doors.
4. Nationwide coverage from our central Oxfordshire location.
5. High-performance sealed units designed to reduce heat loss, minimise condensation, and block out unwanted noise.

Improving your home’s energy efficiency isn’t just about comfort—it’s an investment in long-term savings, sustainability, and the overall value of your property. By upgrading your windows and doors with high-quality, expertly installed glazing, you can enjoy a warmer, quieter, and more efficient home all year round. CN Glass is here to help you make that upgrade with confidence.