Doors Archives - NK Windows – uPVC Windows & Doors

How To Minimise Sunlight Fading

admin — Thu, 20 Mar 2025 00:20:13 +0000

The sun radiates ultraviolet (UV) light, visible light and infrared (IR) light. Visible light is the light humans can see – and also contributes to fading, whilst infrared light is heat energy – and it too contributes to fading. UV does the majority of the damage.

There are 5 options to protect against fade damage:

Laminate glass blocks 99% of UV light whilst still allowing high levels of visible light to enter the room. Clear glass blocks 48% of UV light.
Tinted glass blocks 79% of UV light, however rooms will become a lot darker as visible light transmittance drops by 44%, plus solar heat gain drops by 32%.
Low E coatings (primarily used for heat retention) block 58% of UV light whilst still allowing high levels of visible light to enter the room.
External shutters, louvres or blinds.
Internal blinds.

The post How To Minimise Sunlight Fading appeared first on NK Windows – uPVC Windows & Doors.

Which Is Better: uPVC Windows or Aluminium Windows?

Walden Hudson — Wed, 12 Mar 2025 02:23:52 +0000

Choosing the right windows for your home is a significant decision, especially in New Zealand’s unique climate. uPVC and aluminium windows are two of the most popular options. This article explores their differences to help you make an informed decision.

Thermal performance comparison: Which is warmer, aluminium vs uPVC windows?

Thermal performance is a key consideration when choosing windows, and uPVC is considered warmer than standard aluminium windows. They are known for their excellent thermal insulation properties, offering up to 2.5 times better insulation than traditional double-glazed aluminium windows. This means homes with uPVC windows stay warmer in winter and cooler in summer, helping to reduce energy bills.

Aluminium windows, while strong and durable, are less insulating unless they feature thermal breaks. Thermally broken aluminium windows significantly improve insulation but often come at a higher cost.

Key Takeaway:

If energy efficiency is your priority, uPVC is the best choice for insulation.

Energy consumption: Which is better for my energy bill, aluminium windows or uPVC?

One of the most significant benefits of uPVC windows is their superior thermal performance over standard aluminium windows, saving homeowners up to 50% on energy costs.

New Zealand energy costs have risen faster than inflation over the past decade, so it’s no surprise that homeowners are looking at ways to reduce their energy bill. Windows are one of the fastest ways heat can seep out of a home, so improving thermal insulation can drastically decrease energy use.

Key Takeaway:

For NZ homes looking to reduce their energy bill, uPVC windows reduce heat transfer and retain more warmth than other options, making them a preferred choice.

Cost analysis: Are uPVC windows more expensive than aluminium?

Standard aluminium windows are typically less expensive upfront; however, thermally broken aluminium frames (offering improved insulation) are priced similarly to uPVC windows.

Initial costs and long-term savings are important considerations. Over time, the energy savings from the superior insulation of uPVC windows can offset their higher initial cost. This makes uPVC a cost-effective option in the long run.

Key Takeaway:

When it comes to cost, aluminium may be cheaper upfront, but uPVC provides better long-term value due to energy efficiency savings.

Durability considerations: Are aluminium or uPVC windows easier to maintain?

uPVC windows are highly resistant to corrosion, making them an excellent choice for homes in coastal areas. They can last over 40 years with minimal maintenance, requiring only occasional cleaning.

Durability is crucial, especially in areas prone to harsh weather. This is especially important for New Zealand homes, with a significant proportion of our population living close to the ocean.

Aluminium windows are also durable but may corrode over time if exposed to salt air. These windows require regular maintenance, such as cleaning and anodising, to keep them in top condition.

Key Takeaway:

For low maintenance and corrosion resistance, uPVC windows are an excellent choice, especially in coastal regions.

Noise reduction: What is quieter for my home, uPVC or aluminium windows?

uPVC windows are generally quieter for a home compared to aluminium windows due to their superior insulation and sealing properties. The multi-chambered frames in uPVC windows help block out external noise more effectively, creating a quieter indoor environment.

Aluminium windows, while durable, tend to transmit sound more readily, especially if they lack thermal or acoustic breaks. Noise reduction can be further improved with different glass options, which NK Windows can advise you on.

Key Takeaway:

uPVC is an ideal choice for homes in noisy areas, such as near busy roads or urban centres.

Aesthetic options: Which looks better, aluminium or uPVC windows?

When it comes to aesthetics, both materials have their advantages. Aluminium windows feature slim profiles, and aluminium frames can be powder-coated, coming in a wide range of colours. This makes them ideal for modern architectural designs.

uPVC windows are typically available in white and neutral colours, though other colours can be ordered at an additional cost. While not as slim as aluminium, uPVC frames offer clean lines and versatility for various home styles. Additionally, uPVC can be finished in a variety of different shells from coloured aluminium to coloured wood) for a tailored look.

Key Takeaway:

Whether you choose aluminium or uPVC windows, either option can look good on your home. It comes down to style preference.

Environmental impact: Which material has a lower carbon footprint?

Looking at the whole life-cycle of uPVC vs aluminium, assessments show uPVC stands out as an environmentally competitive option. uPVC windows and doors are more durable, require lower maintenance, have better energy consumption and lower CO2 emissions than alternative materials, like aluminium.

Aluminium is a highly recyclable material, making it an eco-friendly option. However, its production involves significant energy consumption. uPVC is less energy-intensive to produce but is not as easily recyclable as aluminium.

Key Takeaway:

Environmental sustainability is a growing concern for homeowners. If recyclability is a priority, aluminium is the best option. However, if a full life-cycle footprint is considered, uPVC is more sustainable than alternative materials, like aluminium.

Conclusion

When choosing between uPVC vs aluminium windows in New Zealand, consider your priorities:

Choose uPVC for superior insulation, energy savings, long-term cost savings, low maintenance, and improved noise reduction
Opt for aluminium for a modern aesthetic and higher environmental sustainability

Both materials have their strengths, so your decision should align with your home’s needs and personal preferences. Whichever you choose, investing in high-quality windows will enhance your home’s comfort and value.

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Our passion for creating homes filled with warmth and comfort extends to getting every detail right. We keep it real and practical, offering you a variety of choices without overwhelming you with unnecessary options. We welcome you to visit our showroom, where you can see samples that will give you a sense of the finishes and features that will enhance your living spaces.

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The post Which Is Better: uPVC Windows or Aluminium Windows? appeared first on NK Windows – uPVC Windows & Doors.

What are the most energy efficient windows and doors?

Walden Hudson — Wed, 12 Mar 2025 01:55:45 +0000

As energy costs continue to rise, more homeowners in New Zealand are looking for ways to improve their home’s energy efficiency.Windows play a vital role in maintaining indoor comfort and reducing energy consumption.

The right windows can minimise heat loss, lower utility bills, and make your home more environmentally friendly. In this blog, we’ll explore the most energy efficient window options, materials, and technologies available to help you make an informed decision.

Why Energy Efficient Windows and Doors Matter

Windows are often the weakest link when it comes to a home’s insulation. Poor-quality or outdated windows can allow heat to escape during winter and overheat your home in summer.

Energy efficient windows will combat these issues by regulating indoor temperatures more effectively. This will help reduce reliance on heating and cooling systems, lower energy bills, and create a more comfortable and draught-free home.

By upgrading to energy efficient windows, you’re also contributing to a greener future by reducing your carbon footprint.

Types of Energy Efficient Window and Door Glass

Choosing the right type of glass for your windows and doors is crucial for maximising energy efficiency. Here are some of the most effective options:

Double-Glazed Windows and Doors

Double-glazed windows are well known for their excellent insulation properties. In New Zealand, most new houses and additions will require double glazing to comply with the New Zealand Building Code. For renovation, if you don’t require consent, double-glazing isn’t mandatory, but is worth considering for improved warmth and energy efficiency.

These windows consist of two glass panes separated by a sealed space filled with air or inert gas. This design offers several attractive benefits:

Reduces heat transfer
Minimises condensation
Improves sound insulation

Double-glazing is especially effective in moderate climates, making it a great option for many New Zealand homes.

Triple-Glazed Windows and Doors

For those living in colder regions, triple-glazed windows offer even better thermal performance. These windows feature three glass panes with an insulating gas between each layer, providing:

Superior insulation
Enhanced soundproofing
Better resistance to condensation

While triple glazing is more expensive than double glazing, its energy-saving benefits can make it a worthwhile investment in the long run.

Low-E Coated Windows

Low-emissivity (Low-E) windows are another excellent option for energy efficiency. For new builds or consented renovations in New Zealand, these windows are a building code requirement. Low-E windows have a special coating that reflects heat while allowing natural light to pass through, meaning that:

More heat is retained inside during winter
Excessive heat is blocked during summer
High levels of natural light are maintained

This makes them a versatile choice for year-round energy efficiency.

Best Frame Materials for Energy Efficiency

The frame material you choose can significantly impact the energy efficiency of your windows and doors. Here are the top contenders:

uPVC Frames

uPVC (unplasticised polyvinyl chloride) frames are a leading choice for energy efficiency. uPVC frames are also cost-effective and widely available, making them a practical choice for many homeowners. They offer superior benefits over other materials:

Excellent thermal insulation
Durability and low maintenance
Resistance to moisture and corrosion

Wooden Frames

Wooden frames are naturally insulating and add a classic aesthetic to your home. Their main characteristics:

Provide high levels of insulation
Are environmentally friendly when sourced sustainably
Regular maintenance is required to prevent decay and rot

Aluminum Frames with Thermal Breaks

Standard aluminium frames are strong and lightweight, but their energy efficiency is poor without thermal breaks. Aluminium frames with thermal breaks will:

Reduce heat transfer through the frame
Enhance energy performance
Work well for modern designs and large windows

Key Factors to Consider when Choosing Windows and Doors

When selecting energy efficient windows for your home, consider these important factors:

R-Value

R-Value: Measures resistance to heat flow. Higher values signify better insulating properties. Typical R-values are:

R0.17 – 0.26 m2K/W for a single-glazed aluminium window
R0.17 – 0.22 m2K/W for a single-glazed uPVC window
R0.25 to 0.4 m2K/W for a double-glazed standard aluminium window
R0.4 to 0.45 m2/W for a double-glazed uPVC window with standard double glazing
R0.7 to 1.00 m2K/W for a double-glazed uPVC window with Low E and Argon glazing
R1.10 to 2.0 m2K/W for a triple-glazed uPVC window

Solar Heat Gain Coefficient (SHGC)

The SHGC measures how much solar radiation passes through the window. A lower SHGC is ideal for homes in warmer regions, while a higher SHGC suits cooler climates.

Window Placement and Orientation

Strategic window placement can maximise energy efficiency. For example:

North-facing windows capture sunlight in winter
Overhangs or shading devices can prevent overheating in summer

Benefits of Installing Energy Efficient Windows

Investing in energy efficient windows provides numerous advantages:

Cost Savings: Lower energy bills thanks to reduced heating and cooling needs
Improved Comfort: Enjoy a draught-free home with consistent indoor temperatures
Environmental Impact: Reduced energy consumption means a smaller carbon footprint

These benefits make energy-efficient windows a smart choice for both your wallet and the planet.

Frequently Asked Questions

How Can I Tell If My Windows Are Energy-Efficient?

Look for:

ENERGY STAR® certification
Low U-Value and high R-Value ratings
Features like double glazing and Low-E coatings

What Is the Most Energy Efficient Window Frame Material?

uPVC frames are among the best for energy efficiency due to their excellent insulation and low maintenance requirements.

How Long Do uPVC Windows Last?

With proper care, uPVC windows can last 20-30 years or more. They are resistant to warping, moisture damage, and corrosion.

What Are the Best Windows for Keeping Cold Out?

Triple-glazed windows with Low-E coatings in uPVC frames are the most effective for insulating against the cold.

Conclusion

Energy efficient windows are a valuable investment for New Zealand homeowners. They reduce energy bills, improve indoor comfort, and contribute to a sustainable future.

Whether you choose double glazing, triple glazing, or Low-E coatings, ensure that the frame material and window placement align with your home’s specific needs.

Upgrading your windows is a step toward a more comfortable, cost-effective, and eco-friendly home. Consult a local expert for personalised advice and installation to maximise the benefits of energy-efficient windows.

Let's talk about your project

Get a FREE quote

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