Check out our SUMMER Promo
38 d 15 h 40 m
Tips & Advice

6 min read

Can windows and doors make your home more energy efficient?

Written by

Kacper Szczypek

Reading Time: 6 minutes

Modern architecture is very much focused on energy efficiency and ecology. Our homes should be comfortable as well as eco-friendly, especially since January 2017. New technical requirements for energy efficiency of buildings have changed the way we perceive certain aspects of our homes. On the other hand, current designs are all about large glass units. That makes choosing windows and doors even more difficult.

Making your windows and doors more energy efficient will reduce your energy bills and lower your carbon footprint. It will also make your home a better place to live. How to upgrade your windows and doors?

How do windows and doors make your home more energy efficient?

When thinking about energy efficiency, most of us have heating in mind. The aim is to maintain thermal comfort indoors and, at the same time, lower energy consumption. For this reason, we look for solutions that will help us improve our house insulation. But that is only a half of the issue. Energy efficiency refers to lighting as well. Artificial light uses energy. Being less dependent on it, we can lower our electricity bills. To decrease our dependence on artificial light, we choose bigger windows that let more natural light in. Modern energy efficient windows and doors are the answer.

What window parameters should you pay attention to?

While looking for energy efficient windows and doors, we come across many creative terms, such as best insulating windows, energy rated windows or energy saving windows. Meanwhile, the most effective way to choose good windows and doors is to check their technical parameters. There are five of them:

–        the window’s heat transfer coefficient (Uw),

–        the heat transfer coefficient of the glazing unit (Ug),

–        the heat transfer coefficient in the window frame (Uf),

–        the light transmittance coefficient (Lt),

–        the acoustic insulation coefficient (Rw).

The first four are essential for the energy efficiency of your home. Why? While comparing and contrasting technical parameters of certain products, customers tend to forget that energy efficiency does not refer to the heat only. The amount of natural light flooding in through the glazing unit is also important. It helps us to reduce our electricity bills and, therefore, lower our carbon footprint. What’s more, natural light is well-known as beneficial for our health and mood.

The window’s heat transfer coefficient

The Uw informs you about the level of window thermal insulation. It shows how much heat will penetrate 1 m2 of a window in one hour, with a one-degree difference between the temperatures on both sides of the window. The Uw (U-value) is the first parameter to look at. The lower it is, the better the window’s thermal insulation is.

The Uw refers to the window as a whole (U-value for passive windows starts from 0.9 W/m2K, therefore it is more important than the Ug, which refers to the glazing unit only. It does not mean that the Ug parameter is irrelevant in the selection process. It is not, but can be safely considered as secondary to the Uw.

The heat transfer coefficient of the glazing unit

The Ug

describes the heat transfer coefficient of the glazing unit. The higher it is, the more sun radiation reaches the interior of your home. The lower it is, the smaller the heat losses during the heating period. And here is the problem: Should we try to gain as much thermal energy from the sun radiation as possible or lower the heat losses in winter? Taking an extra advantage of sun radiation in winter could be beneficial, but the truth is, it is very inconvenient during summer months. For this reason, it is better to choose windows with lower Ug coefficient and limit the heat losses rather than maximise the sun radiation. Optimal Value of Ug is 0.5 W/m2K, for triple glazed units and 0.6 for double-glazed units.

The heat transfer coefficient in the window frame

The Uf describes the heat transfer coefficient in the window frame. It is influenced by the width of the applied window profiles as well as the materials used in their production. The most common material is steel. Steel improves the mechanical strength of the plastic and makes the windows more durable. Unfortunately, it “gives off” more heat. To provide better thermal insulation results, window manufacturers started using composite fillings. Composite offers good mechanical strength and very good thermal insulation results. The best, however, is wood. Wood frames keep heat perfectly.

As far as the Uf parameter is concerned, the minimum value you should pay attention to is 1.1 W /(m2K).

The light transmittance coefficient

As we have already mentioned, light transmittance has a positive influence on the energy efficiency of your house. The Lt is a parameter describing the light transmittance coefficient. It informs you how much sunlight enters the room through the glazing unit. The Lt value depends on the thickness of the glass, the composition of the raw materials in the glass mass and the coating system used. If you want to take the most advantage of the sunlight in your home, you should choose windows with high Lt parameter. The parameter is defined as a percentage.

Double-glazed or triple-glazed windows: Which are better for your home?

Are you wondering if the number of panes can affect the energy efficiency of your home? The answer is positive. The number of panes really matters and can make a huge difference. The choice should be based on the location of your home as well as the destination of certain rooms. Double-glazed windows let more heat from the sun in, thus the rooms heat up faster. In colder climates, you will benefit more from better insulation. Triple-glazed windows will lower the thermal losses, which is particularly relevant in the case of the windows that are not exposed to a great deal of sun during the winter months.

When is a double-glazed unit enough?

In moderate climate, double-glazed units are considered enough in rooms which are used less frequently, as well as in the areas which are not usually kept at a higher temperature. They can be safely installed in basements, garages. It is also possible to choose double-glazed windows for rooms located in the more sunny part of the house. Double-glazed windows are also enough for buildings with just a few windows or small windows.

Double-glazed Window schema

When to choose a triple-glazed unit?

Triple-glazed windows are beneficial in moderate and cool climates, especially in the rooms with large glass units. They help to keep the temperature on the desired level and, at the same time, let a lot of natural light in. Triple-glazed windows are highly recommended in living rooms and bedrooms.

Passive windows

High quality triple-glazed units meet requirements for passive windows easily, and thus can be installed in modern passive homes. A passive window is characterised by the heat transfer coefficient Uw that is equal or lower than 0.8 (W / (m²K).

 

Triple-glazed Window schema

Improve energy efficiency of your home with high quality windows and doors

The most effective way to improve the energy efficiency of your home is to choose high quality windows and doors. The choice will result in:

  • lower consumption of heat energy,
  • lower consumption of electricity,
  • better living conditions (thermal comfort and natural light).

While choosing windows, pay close attention to technical parameters, especially the values of the Uw and Lt parameters. They are essential for lowering the dependence on heating and artificial light during the day, and thus, improving energy efficiency of your home.

You can achieve the best thermal insulation parameters by choosing triple-glazed windows equipped with a low-emission glazing unit with a warm edge spacer and inter-glazing space filled with a noble gas (such as argon). Do not forget about the frames. Energy efficiency depends on the material window frames are made from. The best results are offered by wooden frames, which keep heat in a perfect way. The whole construction should be complemented by a third gasket inside the frame which improves insulation as well.

Read more

Tips & Advice

6 min read

Importing windows and doors from Poland to the US — tips worth knowing
Products Guide

7 min read

How to choose the right bathroom window
Products Guide

7 min read

Fully fitted composite doors from reliable suppliers
Tips & Advice

5 min read

Replacing windows in your home — Fenbro’s expert advice
Tips & Advice

5 min read

Replacing doors — everything you need to know in the UK and Ireland
Tips & Advice

8 min read

How to install a window – step by step DIY guide
Tips & Advice

7 min read

Thermal insulation and sealing — how does it affect energy efficiency?
Tips & Advice

8 min read

Importing building materials from Poland — everything you need to know about the process
Industry News

4 min read

Breaking news: Fenbro fitting services now available in the UK!
Our Services

8 min read

How much does window installation cost? Understanding the costs of professional window fitting
Tips & Advice

8 min read

Replace standard old windows with sliding patio windows — transform the look of your home!
Tips & Advice

6 min read

At what height should windows be installed — a guide to optimal window placement
Industry News

8 min read

How much do new windows cost? Check what factors influence window prices
Tips & Advice

6 min read

Modern front door styles – design inspirations from the Experts
Tips & Advice

7 min read

Replacing sliding doors in your house — a step-by-step guide introduction
Tips & Advice

5 min read

Setting windows to winter mode: how and when to do it
Industry News

8 min read

Best selling windows and doors in 2024 – new trends and our customers’ most loved products
Industry News

8 min read

Grants for replacing windows and doors – how can you benefit in 2024?
Industry News

3 min read

Popular construction summits in Ireland and the UK: Where to go?
Industry News

7 min read

Get to know our window fitter better! Interview with Marcin Wojtyczko
Our Services

9 min read

Selecting windows and doors for secure and modern office buildings
Tips & Advice

11 min read

12 questions to ask before buying sliding doors
Tips & Advice

8 min read

Does EU joinery comply with the UK safety standard PAS24?
Tips & Advice

10 min read

Which side and direction should a door open? Decide before you buy!
Products Guide

9 min read

Joinery glossary explained – everything you need to know about window and door parameters
Tips & Advice

7 min read

Choosing the right colour for your new windows
Products Guide

9 min read

8 different types of window panes for your home
Tips & Advice

8 min read

How to properly measure for a front door – Our Expert has the answer!
Tips & Advice

10 min read

Building regulations for windows and doors in UK and Ireland
Tips & Advice

4 min read

Is it worth replacing house windows and doors during a major renovation?
Tips & Advice

5 min read

Protection against external noise – the benefits of acoustic doors
Tips & Advice

5 min read

What is the FENSA certificate and what is it required for?
Products Guide

8 min read

Wikęd front doors – what distinguishes this manufacturer’s door models?
Tips & Advice

8 min read

How can the front door improve the BER rating of your house?
Tips & Advice

4 min read

What is the difference between HST and PSK sliding doors?
Tips & Advice

5 min read

Modern smart-slide doors – an alternative to traditional door solutions
Our Services

6 min read

Benefits of choosing Fenbro over your local window and door suppliers
Tips & Advice

5 min read

Following the trend of frameless windows – freedom and elegance
Tips & Advice

6 min read

Standard window sizes – which are used?
Tips & Advice

8 min read

How does Fenbro prepare a quote for a window and door order?
Products Guide

6 min read

Aluminium or uPVC? How to choose the best material for your windows and sliding doors?
Tips & Advice

6 min read

Looking for the cheapest windows? Here’s how to save on importing Polish windows!
Our Services

7 min read

10 reasons why Fenbro customer service gets 5-star ratings!
Products Guide

6 min read

Main differences between casement and tilt and turn windows – pros and cons
Products Guide

6 min read

Window glazing explained – types and functions
Our Services

5 min read

How much does the warranty on doors and windows from Poland cost?
Tips & Advice

7 min read

How to choose the best replacement windows for your house
Products Guide

7 min read

5 points to consider when buying garage doors
Our Services

8 min read

Buying windows online – how to protect yourself from window company scams?
Industry News

5 min read

Poland is one of the world leaders in window and door joinery – here are the reasons and causes
Tips & Advice

6 min read

Most common window types – how do they actually differ?
Products Guide

5 min read

Everything you need to know about bifold doors – pros and cons
Tips & Advice

8 min read

When is it time to replace windows at home? 10 useful tips
Products Guide

5 min read

Simplicity and minimalism in the interior design – new steel-look window and door systems
Our Services

6 min read

Why is professional window replacement better than DIY?
Tips & Advice

7 min read

Everything you need to know about building a house and choosing windows and doors for it
Products Guide

5 min read

Anthracite grey RAL7016 windows: Why are they so popular?
Tips & Advice

6 min read

Features of good windows – what to look for when choosing them
Tips & Advice

6 min read

Guide to Velux window sizes: Choosing the right size for Your home
Products Guide

6 min read

A guide to Passive House Windows
Tips & Advice

6 min read

What makes French doors special? Why are they so popular?
Tips & Advice

6 min read

Double glazing vs Triple glazing: Which is better?
Tips & Advice

6 min read

How to ensure that there is plenty of natural light in the house?
Tips & Advice

6 min read

Foggy windows? 12 ways to get rid of window condensation
Tips & Advice

5 min read

How to choose the right door colour to match the style of your home? – Advice from the experts
Products Guide

5 min read

The comparison of uPVC, aluminium and wooden windows – facts and myths
Products Guide

7 min read

How to choose the best windows and doors for the UK weather – useful tips to know before you buy!
Tips & Advice

4 min read

Comparison of inward and outward opening windows: advantages and disadvantages
Our Services

7 min read

9 Questions you wanted to ask Fenbro Joinery Experts – Q&A
Tips & Advice

6 min read

How to save on heating costs? Window replacement as a way to lower your energy bills in winter
Products Guide

4 min read

What defines premium uPVC sliding systems?
Products Guide

4 min read

Protect your home against all weather conditions with stylish looking alu clad windows!
Products Guide

5 min read

Prolong summer and let more sunlight into your home! Get to know new aluminium sliding doors from Fenbro
Tips & Advice

5 min read

How to effectively reduce outside noise in the comfort of your own home?
Industry News

4 min read

Every satisfied customer is the best reward – Interview with Paweł Brodzik, CEO of Fenbro
Products Guide

4 min read

A great idea for a chill zone in your garden – Aluminium pergolas in the Fenbro offer
Our Services

5 min read

How to transport windows from Poland
Products Guide

5 min read

Why is it worth investing in WIKĘD front doors?
Tips & Advice

5 min read

What are the differences between PVC and uPVC?
Tips & Advice

6 min read

Window maintenance: what you can do to extend the life of your windows
Industry News

5 min read

Why should you buy windows and doors from Poland? We explain the Polish joinery phenomenon!
Tips & Advice

5 min read

How to measure windows correctly? Use these useful tips from our Expert!
Tips & Advice

7 min read

Choosing the right windows – basic parameters and cost-optimisation
Tips & Advice

6 min read

How to assess the quality of insulated glass? A mini guide for window buyers
Our Services

4 min read

Window replacement and installation – Fenbro services in Ireland

Ask our sales Team!

Have any questions?

Follow us on social media

facebook instagram youtube linkedn pinterest twitter Hover
Remove all
Compare products