8. Use the Sun for Electricity and Hot Water
- Based on energy modeling, determine an optimally sized Solar Photovoltaic (PV) System sufficient to meet the energy needs of the house after all other energy-saving measures have been taken into consideration. View the Solar PV video.
- Get several quotes from reliable installers to get the most cost-effective system. Consider a leasing program, such as Sun Run, which can eliminate up-front costs; or consider financing your solar system through your local credit union.
- Consider designing and building the home to be a “net zero ready” or “net zero capable”– a highly energy efficient home, sized and wired for future solar PV installation, which could become a zero energy home when the solar photovoltaic panels are installed.
- Consider using solar PV panels to heat water instead of a solar thermal water heating system. As solar PV is becoming less expensive, it may be more cost-effective to add a few more solar PV panels to power an inexpensive, well-insulated standard water heater, instead of adding a solar hot water system. This can simplify zero energy home maintenance for the homeowner, and lowers costs for builders.
- In warmer climates consider the cost-effectiveness of using a heat pump hot water heater, such as the G.E. GeoSpring Hybrid Watet Heater, the A.O. Smith Voltex Hybrid Electric, or the AirGenerate AirTap Hybrid in conjunction with solar PV. The AirTap can be vented so that the cold air exhausted from the system can be sent outside.
Twelve Steps to Affordable Zero Energy Home Construction