- No Upgrade Recommended: These homes are already ZCA. This may be true for newer homes that are well insulated and already electrified.
- Equipment Electrification: These homes may already have enough insulation to be ZCA, however equipment may not currently be all-electric.
- Basic Envelope + Equipment Electrification: These homes may just need a small amount of added insulation and light window improvements along with the equipment electrification to become ZCA.
- Current Code Envelope + Equipment Electrification: These homes may need a relatively substantial envelope upgrade to become ZCA.
- Beyond Code Envelope + Equipment Electrification: These homes are likely in a cold climate that requires even more substantial envelope upgrades to become ZCA.
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