Glossary · Energy, bills & ratings
Net zero / net-zero ready home
Also called: net zero home · net-zero energy · net zero ready · zero energy ready · zero energy home · Zero Energy Ready Home
A net-zero home produces as much energy as it uses in a year, usually with solar; a net-zero ready home is built so it could, once panels go on.
What it means
These homes start with a very efficient building envelope and equipment, then add on-site renewable energy to cover what's left. Ready homes meet the efficiency requirements without the renewables yet. Existing homes can get there through deep energy retrofits.
Why it matters in an audit
Net-zero labels give a clear target for deep retrofits and new builds, and an audit shows how far your home is from it.
Typical numbers
Reference values with their sources. Your auditor’s report gives the figure for your own house.
| What | Value | Source |
|---|---|---|
| HERS Index equivalent (RESNET) | A score of 0 means the home produces as much energy as it uses | resnet.us ↗ |
| DOE Efficient New Homes (formerly Zero Energy Ready Home) | Certified homes acquired before July 1, 2026 could qualify for the 45L builder credit of up to $5,000 | energy.gov ↗ |
In the United States
DOE renamed its Zero Energy Ready Home program 'DOE Efficient New Homes'; the related 45L builder tax credit ends for homes acquired after June 30, 2026.