Articles - Certified Energy

How Homeowners Can Interpret And Act On Their NatHERS Existing Homes Rating

Written by Jamie Bonnefin | Jul 1, 2025 2:31:01 AM

Unlock the potential of your home by understanding and acting on your NatHERS Existing Homes rating for a more energy-efficient, comfortable living space.

Understanding Your NatHERS Rating: What Do The Stars Mean?

Your NatHERS rating gives you a clear indication of how energy-efficient your home is. The rating is expressed in stars, with more stars representing better performance. For instance, a home with a 6-star rating is reasonably energy-efficient, whereas a 10-star rating indicates exceptional energy performance. Understanding where your home stands can help you identify areas for improvement.

If your home has fewer stars, it means there's significant room for enhancements. Conversely, a higher star rating means your home is already performing well, but there might still be minor adjustments that could push it towards peak efficiency.

Prioritising Upgrades: Where To Start For Maximum Impact

Once you have your NatHERS rating, the next step is to prioritise upgrades. Start by focusing on the areas that will give you the most significant improvement in energy efficiency. Typically, these include insulation, windows and glazing, and modernising appliances.

A strategic approach is to address the most critical issues first. For example, if your insulation is poor, improving it will have a more substantial impact on your overall rating than minor adjustments in other areas. Similarly, upgrading single-pane windows to double or triple glazing can drastically reduce heat loss.

Insulation Improvements: Keep The Heat Where It Belongs

Insulation is one of the most effective ways to enhance your home's energy efficiency. Proper insulation in the walls, roof, and floors can significantly reduce the need for heating and cooling, maintaining a comfortable indoor temperature year-round.

Consider upgrading to high-performance insulation materials such as spray foam or rigid foam boards. These materials offer superior thermal resistance compared to traditional options like fiberglass. Additionally, sealing gaps and cracks in your home can prevent drafts and further improve insulation performance.

Window and Glazing Solutions: Enhancing Thermal Performance

Windows play a crucial role in your home's thermal performance. Upgrading to double or triple glazing can dramatically reduce heat loss and gain, making your home more comfortable and efficient.

Low-emissivity (Low-E) coatings on windows can also enhance their performance by reflecting heat back into the room during winter and keeping it out during summer. Additionally, consider installing window treatments such as heavy curtains or shades to further regulate indoor temperatures.

Appliance Upgrades: Boost Efficiency With Modern Solutions

Modern appliances are designed to be more energy-efficient than older models. Replacing outdated appliances with ENERGY STAR-rated ones can significantly reduce your home's energy consumption.

Focus on high-impact appliances such as HVAC systems, water heaters, refrigerators, and washing machines. These upgrades not only improve your NatHERS rating but also reduce your energy bills, providing long-term financial benefits.