Q&A

How did the SPAN smart panel pay for itself? It made us aware that the backup boiler had become our primary source of heat – not the heat pump and that it needed to be adjusted or fine tuned. We use it to turn off our water heater (our third largest energy user) when we travel remotely and to also turn it back on before we return to have hot water when we get home!

What kind of shingles? Tesla Solar Shingles. Ours are 15” X 45”. Solar installations in 2023 nationally ranged between $2 to $4 per watt. Ours came in at $2.66.
URL versus QR Code for video: https://www.greenwaysolar.org/blog/forever-home-a-sustainable-oasis-in-lanesboro-minnesota

Slab on grade? No, we have a walk out basement with the same footprint of the house – 1,660 sq ft. Tesla batteries are recommended to be kept above 40 degrees fahrenheit. The basement is a great spot for that. Also note that the inverters give off heat which helps during the winter.We have them in a mechanical room with a separate door from the rest of the basement to minimize summer cooling load.

How much per square foot to build this house less the land please? We have a 1,660 sq ft home on a lot that was a composite of 7 smaller lots and is a combined 1.1 acres in size. This was ideal because it allowed us to position the home on the composite to capture the maximum solar potential of the site. Restored pollinator prairies have been re-established on our property and on the adjoining 2+ acres of city property where we removed invasives (buckthorn and honeysuckle).

Zehnder ERV questions: The tubes are a strong 3” in diameter and are used both for supply and return. I replace the small intake filter every 45 days during the summer and quarterly during the winter. The output filter every 6 months. These filters cost @ $25 each. The Zehnder ERV is much quieter than any other unit I am aware of.

How does your lifestyle change with this house? Do you watch weather more? Do you clean snow off the solar panels? Do you run the heat more before a storm to store temp before solar is covered with snow? We live a life of grace and gratitude. All our living space is essential on the main floor with no steps. It has reduced our annual living expenditure – we use export energy dollars to offset city sewer and water expenses. It has given us a sense of purpose and joy of being part of a larger energy efficient home community. The house essentially runs itself except for a semi-annual switch over between heating and cooling. Our battery automatically backs up to one hundred percent during NOAA severe weather alerts and is held there until the alert expires. The nice thing about infloor heat and cooling is that it holds room temperatures better than forced air systems. When you walk in the door, you notice the difference. Our favorite daily activity is to see who can guess most closely what our solar energy production for the day has been. Mary is usually within 10 kW/hrs

Solar panels versus shingles? I like the look of the shingles better. PV metal frames hold ice and snow. Shingles can cover the whole surface. We generate more than twice as much energy as our house uses with shingles already. Remember our system is rated at 32 kWs DC.

Did you use the same heat pump for your HVAC and DHW? No. We have a stand alone DNW, jacketed heater set up on limited use with the local utility.

Any Certifications? No

Abstract

This article explores the design, construction, and real-world performance of an all-electric, solar-shingle home built in southeastern Minnesota using passive design principles, advanced electrification strategies, and distributed energy storage. The project demonstrates how architectural decisions, site optimization, mechanical systems, and energy management technology can be integrated into a resilient, comfortable, and highly productive residential energy system. Over three years of operational data reveal that the home ranks among the highest-performing solar roof systems in the country while maintaining occupant comfort, energy security, and environmental responsibility. The project also illustrates lessons for builders, contractors, designers, and sustainability professionals seeking to implement holistic, future-ready housing solutions.

Designing the House Around the Roof

One of the most unconventional — and ultimately decisive — design choices in this project was to design the house around the roof rather than designing the roof around the house. This reversal of conventional residential design thinking emerged from a commitment to maximize solar performance in a northern climate. In Minnesota, winter snow accumulation, low solar angles, and limited daylight hours demand roof geometry that sheds snow efficiently while maintaining high solar exposure in a time of low solar production and high energy demand.

The final solution was a two-pitch roof with a steep 10:12 slope oriented for optimal southern exposure. The roof contains no penetrations on its south face, preserving both watertight integrity and solar efficiency. Functional solar shingles occupy the central roof area, while non-generating “dummy” shingles frame the perimeter and overhangs for visual continuity and weather protection.

The result is a roof that not only generates energy but actively supports winter performance. After heavy snowfall, solar production resumes quickly because the steep pitch and thermal behavior of the shingles encourage snow shedding. This contrasts with conventional rack-mounted panels, which often remain snow-covered for extended periods in similar climates.

This approach demonstrates a crucial lesson for builders and designers: solar integration is not a technology add-on but a primary architectural driver. When solar is considered from the earliest design stage, structural, mechanical, and aesthetic systems align more naturally and efficiently .

Site Selection and Orientation

The project site was selected using satellite imagery and solar modeling to identify south-facing building opportunities within the desired community. Once a site was chosen, design software was used to position the structure for maximum solar access. This process ensured that roof planes, shading patterns, and seasonal sun angles were optimized before construction began.

Even existing vegetation was carefully considered. A large walnut tree on the western side of the site created late early-day shading on part of the roof, influencing roof layout decisions and system placement. Rather than removing the tree, the design balanced ecological preservation with energy performance.  (Note, we struggled to keep cars, equipment, construction materials, etc from being stacked over the tree’s root system attempting to preserve its health and vigor.)

This level of site-specific planning highlights an often-overlooked reality: energy performance is determined long before equipment is installed. Builders who ignore orientation and solar access leave performance on the table regardless of how advanced their technology becomes.

System Capacity and Energy Production

The home contains approximately 1,660 square feet of living space and 2,260 combined square feet of roof surface between the house and garage. The solar shingle system provides 32 kW of DC capacity and approximately 26.6 kW of AC output. Over three years of operation, the home has consistently ranked within the top one percent of solar roof producers and exporters nationwide.

Seasonal production follows expected patterns, with peak output in July and minimal output in December and January. However, the shoulder months — March, April, September, and October — demonstrate especially strong net export performance.

Annual performance data show that the home produces significantly more electricity than it consumes when vehicle charging is excluded. Even when vehicle charging is included, net export remains substantial. The system consistently supplies energy to the grid while maintaining household and transportation needs .

Energy Consumption Patterns

The home’s largest energy load is electric vehicle charging, followed by heating and cooling, and then domestic hot water. Vehicle charging averages approximately 450 kWh per month, costing roughly $46 at local electricity rates. This translates into a reliable, low-cost transportation energy model that eliminates fuel volatility and emissions while delivering daily convenience.

Heating and cooling costs average approximately $179 per month, despite Minnesota’s challenging climate. These results are made possible by a passive-inspired building envelope featuring high-performance insulation, airtight construction, and European-style fiberglass windows and doors. Builders reported noticeable warmth in the structure even before mechanical systems were fully operational.

The performance illustrates that electrification does not require excessive energy consumption when paired with envelope efficiency. Instead, the envelope becomes the primary energy system, with mechanical systems playing a supporting role.

Air-to-Water Heat Pump Strategy

The home uses an air-to-water heat pump rather than a conventional air-to-air system. Heating and cooling are delivered primarily through in-floor hydronic loops across five zones. This approach offers exceptional comfort, quiet operation, and uniform temperature distribution.

Cooling performance, however, required additional engineering refinement. In-floor cooling is constrained by indoor humidity because condensation risk rises when floor surface temperatures fall below the dew point. As humidity increases, control systems must raise water temperature, reducing cooling capacity.

To address this, a fan coil system was added upstream of the mixing valve, allowing 40-degree water to deliver additional cooling capacity when humidity loads increase due to occupancy or activity. This hybrid approach preserves radiant comfort while maintaining system stability.

The system demonstrates a critical insight for contractors: advanced heat pump strategies demand integrated humidity control, not just temperature control .

Air Quality and Filtration

Indoor air quality was treated as a primary health metric. The ventilation system uses small-duct distribution with multi-stage filtration, including HEPA and activated charcoal filters. Filters are easily replaceable, encouraging proper maintenance.

This system has proven particularly valuable during wildfire smoke events, when outdoor air quality deteriorates significantly. The ability to maintain clean indoor air while preserving energy efficiency highlights the growing intersection between sustainability and public health.

A whole-house dehumidifier further stabilizes indoor comfort, even though its acoustic presence remains noticeable in an otherwise quiet home. The tradeoff is considered worthwhile for long-term moisture management.  (Note: the whole house dehumidifier cycles frequently (large power demand) so we added a standard home dehumidifier to our system removing the majority of humidity with the whole house system cycling only to meet peak loads.  I hope this makes sense.)

Battery Storage and Smart Load Control

A 13.5 kWh battery provides daily load shifting and outage resilience. The battery is routinely discharged during peak household demand and recharged during solar production. During storm alerts, the system automatically returns to full charge to preserve backup readiness.

Power outages over three years totaled fewer than 70 minutes combined, yet the battery system demonstrated its value even during short interruptions. In one documented event, the battery recharged itself while the grid was down due to active solar production.

A smart electric panel enables remote circuit prioritization, allowing primary, secondary, and tertiary loads to be managed dynamically. Early performance data revealed that backup heating systems were consuming more energy than intended. Adjusting control settings based on real-time data significantly reduced consumption.

This illustrates a powerful principle: data transparency enables continuous optimization. Without granular feedback, inefficiencies remain invisible .

Distributed Energy as Infrastructure

The project treats distributed solar and storage not merely as household upgrades, but as infrastructure assets. Minnesota utilities now recognize that distributed generation and storage can be more cost-effective than centralized peaking plants. Incentives reflect this shift, including substantial battery rebates tied to grid support participation.

The home also anticipates vehicle-to-home and vehicle-to-grid integration, recognizing that automotive batteries represent a more economical storage resource than stationary systems. This strategy points toward a future in which homes, vehicles, and utilities operate as integrated energy ecosystems rather than isolated components .  (Note: this is something not commonly available but can be designed into new or rebuilt systems for future use.)

Construction Approach and Craft

The home was built by Amish craftsmen working alongside specialized HVAC and electrical contractors. While some subcontractors were initially hesitant to work with unfamiliar technologies, collaboration and shared learning ultimately produced a highly coordinated installation.

Solar shingles were installed in a day and a half by a certified crew, followed by electrical commissioning using tablet-based diagnostics to verify each shingle run. The precision and speed of installation demonstrated that advanced systems can be practical when teams are properly trained.

The project also incorporated reclaimed barn wood from a family farm, integrating cultural continuity with sustainable material reuse. Landscaping reused excavated stone and restored over three acres of prairie habitat, supporting stormwater management, biodiversity, and site resilience.

Water Management and Landscape Integration

Because the site sits on bedrock, stormwater management required creative engineering. A rain garden trench allows water to flow east or west while retaining runoff on site. This protects downhill neighbors and prevents erosion while supporting soil recharge.

Roof runoff from the solar shingles is directed into this system, integrating building and landscape into a unified hydrologic strategy. This reinforces the principle that sustainability extends beyond energy into ecological stewardship.

Rethinking Return on Investment

Questions about financial return are inevitable. Solar shingles in 2022 ranged from approximately $2 to $4 per watt, with this system installed at roughly $2.66 per watt.

However, financial ROI alone fails to capture resilience, comfort, health, energy security, and climate risk mitigation. The project reframes value as continuity of function during outages, freedom from fuel volatility, long-term operating stability, and contribution to climate responsibility.

In this context, sustainability is not a luxury feature but a form of risk management.

Collaboration as a Design Method

More than twenty contributors shaped the final design, including architects, engineers, energy modelers, builders, and experienced homeowners. This distributed knowledge model proved more effective than relying on any single discipline.

The project underscores that future-ready housing is a collaborative endeavor. No individual professional holds all necessary expertise. Integration, not specialization, defines success.

Implications for Builders and Professionals

This project demonstrates that:

• All-electric homes perform exceptionally well in cold climates when properly designed.
  • Solar shingles can rival or exceed conventional panel systems when integrated architecturally.
  • Air-to-water heat pumps are viable but infloor cooling requires humidity-aware design.
  • Battery storage adds operational intelligence, not just backup power.
  • Smart panels enable behavioral and system optimization.
  • Landscape design is inseparable from building sustainability.
  • Collaboration reduces risk and increases innovation.

Together, these lessons form a blueprint for future residential construction that is resilient, efficient, and human-centered.

Conclusion

The all-electric, solar-shingle, Amish-built forever home represents more than a technical achievement. It is a systems-thinking demonstration of how architecture, energy, comfort, health, and ecology can be unified into a single residential model.

Rather than chasing individual technologies, the project pursued coherence. That coherence is what produced top-tier energy performance, occupant satisfaction, and long-term resilience.

For sustainability professionals, builders, and designers, this project confirms that the future of housing is not about isolated upgrades. It is about integrated intention.

Green Home Institute continues to highlight projects that prove sustainable design is not theoretical — it is livable, practical, and ready now.

Key Takeaways

• • Designing around solar geometry significantly improves long-term performance.
  • Passive envelope strategies remain the foundation of electrified homes.
  • Air-to-water heat pumps Infloor cooling requires integrated humidity management.
  • Battery systems provide optimization and resilience, not just backup.
  • Smart electrical panels enable continuous performance tuning.
  • Distributed energy systems strengthen grid resilience.
  • Landscape and water management are core sustainability systems.
  • Collaboration across disciplines drives superior outcomes.
  • Sustainability delivers value beyond financial ROI alone.