What Is Zero Net Energy?
Imagine a house that makes as much energy as it uses. That’s what a Zero Net Energy (ZNE) home does. It’s super energy-efficient and uses renewable energy (like solar panels) to power itself. Over a year, it produces enough energy to cancel out what it uses—so the energy bill can be zero or even negative! Our PDF below explains this in more detail.
Okay, How Do You Build a ZNE Home?
To build a ZNE home, you need to focus on three main areas:
1. Make the House Super Efficient
This means improving the “envelope” of the house—the parts that keep heat in or out:
- Insulation: Use high-quality and thick insulation.
- Air Sealing: Stop air leaks so heating and cooling don’t escape.
- Windows: Use triple-pane windows that keep heat in during winter and out during summer.
- House Orientation: Position the house to get the most sunlight.
2. Use Propane Appliances
Propane is a clean and efficient fuel. These appliances help lower energy use:
- Furnace
- Water heater
- Stove
- Fireplace
- Clothes dryer
3. Cut Down on Other Energy Use
- Use Energy Star appliances (they’re designed to use less energy).
- Switch to LED lights.
- Install energy monitoring devices to track and reduce usage.
Propane vs. Electricity: Which Is Better?
Here’s a cool fact:
To get 1 unit of energy to your home, it takes:
- 2.61 units of electricity
- Only 1.01 units of propane
That means propane is way more efficient and wastes less energy getting to your house.
What’s a HERS Score?
The Home Energy Rating System, or HERS score, is a way to measure how energy-efficient a home is. Think of it like a grade—lower scores mean the home uses less energy. A typical new home might score around 100, but a Zero Net Energy (ZNE) home can score zero or even go negative if it produces more energy than it uses.
Real-Life Example
One home reached ZNE status by combining propane appliances with solar panels. It’s 1,912 square feet and built with super insulation and triple-pane windows. It also uses a highly efficient propane tankless water heater. Without solar, the home scored a 34 on the HERS scale. With solar, it dropped to an impressive -21. Even better, the home earns $343 a year by selling extra energy back to the grid.
Why Propane Helps
Propane is a smart choice for energy-efficient homes. It’s often more affordable than high-tech systems like ground source heat pumps. It works well in all kinds of weather, making it a very reliable choice for us southwestern Pennsylvanians. Plus, propane tankless water heaters produce 67% fewer emissions than traditional electric models, making them a cleaner option for the environment.
