Select R408 credits
The R408 Credits tab is Ohio's prescriptive "additional efficiency credit" pathway. You pick the efficiency measures the proposed home uses, and the tool confirms the home earns enough credits to comply. Staff and external reviewers can both edit this tab.
Choose the compliance pathway and building size
Choose the rulemaking pathway the analysis should evaluate:
| Compliance pathway | Under 5,000 SF | 5,000 SF or more |
|---|---|---|
| 2024 Prescriptive | 10 credits | 15 credits |
| 2027 RCO OHBA #1 | 5 credits | 10 credits |
| 2027 RCO OHBA #2 | 20 credits | 25 credits |
The OHBA pathways are marked Under consideration for the 2027 RCO because they are proposals rather than adopted requirements. The selected pathway and building size together set the target used throughout the analysis.
Switching pathways clears the selected measures so the new analysis starts cleanly. Clear All also clears the measures and returns the pathway to 2024 Prescriptive, while leaving the building size unchanged.
Two climate zones at once
Ohio spans Climate Zone 4 and Climate Zone 5. A measure can be worth a different number of credits in each zone, and some measures do not apply in a given zone at all. The selector tracks both zones side by side, so you can confirm the proposed package complies in both CZ4 and CZ5. A progress bar for each zone shows how close the current selection is to the required credits.
Toggle measures
Measures are grouped into categories — Envelope, HVAC Equipment, Water Heating, Ductwork, Ventilation/Infiltration, Appliances/Lighting, and Renewable Energy. Turn on each measure the proposed home includes. As you toggle measures, the per-zone credit totals and progress bars update.
Mutual-exclusion groups
Some measures cannot be combined because they describe the same thing at different levels (for example, two different total-load-reduction percentages, or competing fenestration options). These are mutual-exclusion groups: selecting one measure in the group automatically rules out the others. The selector enforces this so you cannot accidentally double-count.
When the package complies
A proposed package is compliant in a zone when it meets both of these:
- The selected measures total at least the required credits for the building size under the selected pathway, and
- At least two distinct measures are selected.
Confirm both Climate Zone 4 and Climate Zone 5 are compliant before relying on the result.
Next step
With the credits chosen, move on to the lifecycle-cost calculation. See Enter LCC inputs.