Written by Mona Kamel, Fairfax County Resident and Principal Builder of M.O.L.Y. Homes

A few years ago, my family of four set out to build a net-zero energy home. We weren’t just experimenting with green living — we were investing in a better way of life. Today, our home is completely free of gas and electric bills, and it provides year-round comfort that far exceeds anything we imagined.

As a female builder in a male-dominated field, that experience was a turning point. It didn’t just shift how I think about construction — it transformed how I build, lead, and live. Now, I help others do the same: design and build homes that are efficient, resilient, and deeply comfortable.

If you’re curious about what goes into a high-performance, net-zero home, here’s what I’ve learned — both as a homeowner and as a professional committed to doing things differently.

Constructing a net-zero home added a whole new dimension for our family. Good design, airtight construction, and sustainable systems can deliver not only energy savings but also improve everyday living.

No Gas or Electric Bills — Yes, Really

Thanks to a tight, well-insulated envelope and an efficient heat pump mechanical system, heat pump water heater and a heat pump dryer powered by solar panels, our energy use dropped so low that the sun now powers our entire home. No heating bill in winter, no cooling bill in summer, no surprises — just consistent, predictable comfort. Whether you’re starting from scratch or upgrading an existing structure, the focus should be on building a home that delivers true energy independence.

Unmatched Comfort

One of the biggest surprises of living in a net-zero home was how incredibly comfortable it is. Thanks to a well built and sealed envelope, this house is 87% more efficient than a house built to the 2006 efficiency standards. There are no drafts, cold spots, or humidity issues. Every room on every floor feels just right, every season of the year.

Sustainability Without Sacrifice

Many people assume you have to compromise aesthetics, convenience, or lifestyle to go green. That hasn’t been our experience at all. Our home feels modern, inviting, and bright. Sustainability isn’t about sacrifice — it’s about smarter choices that enhance both form and function.

A Smart, Future-Proof Investment 

Net-zero homes aren’t just environmentally sound— they’re financially wise. Energy prices are only going one direction, and demand for high- performance homes is growing. Our home is future-proof, low-maintenance, and designed to retain its value for decades. With just 5.13% added cost to the initial construction cost (this number is projected to get better with demand), this premium is already paying off, month after month, in energy savings.

Build a Home That Works for You — and the Planet

Building a net-zero home was one of the best decisions we’ve made. For our family, it means living in a space that supports our health, our finances, and our values. If you’re considering it, my advice is simple: invest in a tight envelope, plan your energy systems carefully, and work with people who understand high-performance building. The result might just be a home that changes how you live, in all the best ways. Consider building a home that saves you money, protects your family, and feels amazing to live in — every day.

Mona Kamel lives in Vienna with her husband, son and daughter. She is the Founder and Principal Builder and Designer of M.O.L.Y. Homes. She built her own net-zero home in 2021.

Climate Matters is the blog of Fairfax County’s Office of Environmental and Energy Coordination, where we share stories, insights and information related to climate change and environmental sustainability. Posts are written by knowledgeable and passionate OEEC staff members and guest authors. To read all blog posts, visit Climate Matters.