Homeowners need ways to keep their homes cool without driving up energy costs during the summer. One effective solution is installing energy-efficient windows. New windows help you keep a consistent and comfortable indoor temperature and can significantly reduce air conditioning expenses.
In this blog, we’ll explore the benefits of energy-efficient windows, the types of windows and materials best suited for the summer heat, and the certifications and ratings that can guide you in choosing energy-efficient windows for your home.
The challenge of staying cool in the summer
Relentless summer heat often forces air conditioning systems to work overtime, which means high energy bills. Older, traditional windows are poorly insulated, allowing cool air to escape and warm air to enter your home making your HVAC system work even harder. And despite all that extra effort, your home may not feel cool.
The benefits of new windows this summer
New energy-efficient windows can improve a home’s comfort and energy performance regardless of the hot summer months. Energy-efficient windows use advanced technology and materials to minimise heat transfer, increasing energy efficiency.
In summer, that means reduced cooling costs because of a more stable indoor temperature and a subsequently reduced workload on air conditioning systems. Additionally, the more consistent indoor temperature means homeowners enjoy cooler rooms without having to constantly adjust the thermostat.
Lower energy use also means a positive environmental impact and can enhance a home’s market value because prospective buyers are often willing to pay more for properties featuring modern, energy-saving features.
Window features that enhance efficiency
Among the various window styles available, casement windows and double-hung windows stand out for their energy efficiency and practicality.
Double-glazed windows
These windows have two panes of glass with a space between them, providing excellent insulation. They are effective in reducing energy costs and are suitable for various climates, helping to maintain a comfortable indoor temperature.
Low-E coated windows
Featuring a thin, transparent coating, these windows reflect infrared light but let visible light pass through. They are ideal for sunny areas, reducing heat gain and improving energy efficiency by keeping interiors cooler.
Tinted glass windows
Designed to reduce glare and heat absorption, these windows are perfect for areas with intense sunlight. The tint can help lower indoor temperatures and protect furnishings from UV damage while maintaining a comfortable light level.
Gas-filled windows
These windows use inert gases like argon or krypton between the panes for enhanced insulation. They are highly effective because they reduce heat transfer and maintain a stable indoor environment.
Triple-glazed windows
Triple layers of glass mean superior insulation, making them perfect for extreme climates because they reduce heat gain in summer, providing the highest level of energy efficiency and comfort.
Window types and materials for efficiency
When selecting energy-efficient windows, homeowners can choose from several options that impact performance.
Vinyl windows, known for their insulation properties and cost-effectiveness, resist heat transfer and require minimal maintenance, making them ideal for hot climates. Wood windows, though needing more upkeep, offer excellent thermal performance and a timeless aesthetic when properly sealed.
Fibreglass windows provide superior energy efficiency with low thermal conductivity, durability, and minimal maintenance, making them perfect for extreme temperatures. Composite windows combine the strength of wood with the low maintenance of vinyl, offering excellent insulation and durability, suitable for various climates and conditions.
ENERGY STAR® certification
How can you know that you’re getting the highest quality window? Look for ENERGY STAR® Certification.
ENERGY STAR® certified windows are about 20% and ENERGY STAR® certified doors are approximately 15% more efficient and sliding doors are a whopping 55% more energy efficient with improvements that enhance overall performance. This increased efficiency helps to keep your home cooler in the summer, decreasing reliance on cooling systems.
CSA certification
CSA certification standards are also a reliable measure of the energy efficiency of your windows. Check for these factors when assessing your new windows.
U-factor
The U-factor measures the rate of heat transfer from warm to cold areas, expressed in watts per square metre Kelvin (W/m²K). A lower U-factor indicates a more efficient product, minimising heat loss.
Solar heat gain coefficient (SHGC)
The SHGC is a ratio of the solar heat passing through a window or door. The higher the SHGC number, the more solar heat the product allows in. It’s crucial for managing heat gain in sunny climates.
Energy rating (ER)
The ER value represents the balance between U-factor, SHGC, and air leakage, specifically for windows and doors. A higher ER number means higher efficiency, meaning the product is better at maintaining energy performance and comfort in a building.
R-value
The R-value measures the resistance to heat transfer, expressed in square feet per hour in degrees Fahrenheit per British thermal unit (sq. ft. x h x °F/Btu). Higher R-values indicate better insulation. While not part of energy performance standards, R-values are often checked when assessing insulation effectiveness.
Visible transmittance (VT)
Visible transmittance (VT) is a ratio that measures the amount of visible light that can pass through a window or glazing product. The higher the VT number, the more natural light enters the space reducing the need for artificial lighting.
Centre-of-glass rating
The centre-of-glass rating evaluates the energy efficiency of the glass portion of a window or glazing product, excluding the frame and other components. This rating helps compare the thermal performance of different glazing options, focusing solely on the glass’s insulating properties.
Making the Right Choice
Choosing the right energy-efficient windows involves considering factors like the home’s design, climate, and budget. Homeowners should take a look at their current windows, targeting drafty or single-pane windows for replacement. Researching different window types and focusing on those with the ENERGY STAR® label is crucial.
Window treatments that can enhance energy efficiency
A window refresh can further enhance the energy efficiency of your home. Options such as blinds, shades, and curtains can provide additional insulation by blocking out excessive heat during summer and retaining warmth in winter. Cellular shades, for example, are designed with air pockets that trap air and create an insulating barrier. Reflective films can also be applied to windows to reduce solar heat gain.
By incorporating appropriate window treatments, homeowners can enhance the effectiveness of their energy-efficient windows, leading to even greater energy savings and improved indoor comfort.
Installation can make all the difference
Proper installation means you gain the full benefits of energy-efficient windows. Even the highest-quality windows can underperform if not installed correctly. Professional installation ensures that windows are sealed and fitted properly, preventing air leaks and drafts that can compromise energy efficiency.
Incorrect installation can lead to gaps and poor insulation, reducing or removing the windows’ energy-saving potential. Ensuring that you’re working with experienced installers is essential to realising the full benefits of energy-efficient windows.
Consult Centennial Windows & Doors for a reputable window installer with a long track record of installing energy-efficient windows to make them a worthwhile investment.