A ZEH home (Net Zero Energy House) is a residence that combines the three elements of "energy generation," "insulation," and "energy efficiency" to bring annual energy consumption effectively to net zero. Along with the advantages and disadvantages, this article also explains the subsidy programs.
What Is a ZEH Home? The Three Elements and How They Work
ZEH stands for "Net Zero Energy House" and refers to a residence that incorporates energy generation through solar power, insulation through insulation materials and insulated windows, and energy efficiency through energy-saving equipment and HEMS (Home Energy Management System).
What Types of ZEH Homes Are There?
- ZEH: Reduces energy consumption by 100% or more (energy-saving rate of at least 20%)
- Nearly ZEH: Reduces energy consumption by 75% or more (energy-saving rate of at least 20%)
- ZEH Oriented: Energy-saving rate of at least 20% (renewable energy installation is optional)
- ZEH+: Higher insulation performance and HEMS installation (energy-saving rate of at least 25%)
What Are the Benefits of Living in a ZEH Home?
- Higher asset value: More likely to receive a strong rating under BELS (Building-Housing Energy-efficiency Labeling System)
- Better insulation performance: Effective for helping prevent indoor heatstroke and heat shock
- Peace of mind during power outages: Energy stored through solar power can be used during disasters
- Significantly lower utility costs: Self-generated electricity can cover household power needs
What Are the Drawbacks of a ZEH Home?
- High initial cost: The cost of solar power systems and energy-efficient equipment
- Roof limitations: Constraints on angle and direction for installing solar panels
- Unstable electricity buyback prices: Prices have been trending downward year by year
Subsidy Programs for ZEH Homes
Four types of subsidy programs are available: the ZEH Support Program, the ZEH+ Demonstration Program, the ZEH+R Enhancement Program, and the Advanced Renewable Energy Heat Installation Support Program. Please note that you cannot change the floor plan or equipment after applying.
Frequently Asked Questions (FAQ)
Q. How much more does it cost to build a ZEH home?
As a general guideline, the additional cost is about 2 to 3 million yen compared with a standard home. Using available subsidies can reduce the effective out-of-pocket burden.
Q. Can an existing home be converted into a ZEH home?
Yes, it is also possible to convert an existing home into a ZEH home through renovation. The main work involves insulation upgrades and solar power installation, and we recommend consulting a certified ZEH builder.
Q. Does a ZEH home have an advantage when selling?
Yes. Homes with high energy efficiency tend to receive stronger BELS ratings, and their asset value is more likely to hold up.
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- What Are the Rent Reduction Guidelines? Explaining the Impact of the 2020 Civil Code Revision and How Landlords Should Respond
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