How do I interpret the REScheck report results (quick guide)?

Check Overall UA vs Baseline, then inspect component prescriptive checks. If UA > baseline, focus on the largest contributors (usually windows or roof) and run sensitivity tests.

What does the Tradeoff Summary show?

It shows credits and deficits across assemblies — where you gained or lost UA relative to code.

What if a single component fails prescriptive but UA passes?

Some jurisdictions require prescriptive compliance for certain assemblies; check with your local code official — otherwise document tradeoffs clearly.

How important are NFRC window labels in the report?

Very — accurate U‑factor and SHGC from NFRC or manufacturer labels are key to avoid modeling errors.

What does a performance alternative error mean?

The DOE simulation engine sometimes cannot complete performance calculations for complex basement/slab inputs — recheck those entries. DOE FAQ explains this error.

How do I document the REScheck for plan review?

Include the REScheck certificate, a one‑page summary of tradeoffs, and manufacturer spec sheets for windows/insulation.

How to prepare for a REScheck inspection (checklist)?

Gather drawings, insulation specs, window labels, signed compliance form, and blower door / duct test results if required.

Will inspectors verify insulation R‑values on site?

Yes — inspectors commonly check installed insulation depths, labels, and cavity/continuous installation methods.

Do I need a blower door test for REScheck?

Not always. Some jurisdictions require blower door testing for performance paths — check local code.

Should I provide cut sheets at inspection?

Absolutely — provide manufacturer cut sheets for windows, insulation, and HVAC equipment used in the model.

What common inspection mistakes cause delays?

Mismatched dimensions, missing labels, or installed components that differ from modeled assumptions.

Can I correct failed items after inspection?

Often yes — you can rework insulation, replace windows, or submit a revised REScheck, but this can delay permits.

Can I use REScheck in every state?

REScheck is widely accepted for jurisdictions that adopt IECC; however, states with their own codes (e.g., California) may not use REScheck. Always confirm locally.

What do state modifications mean for REScheck?

State amendments can alter prescriptive minima or inspection requirements — REScheck can still be used if the jurisdiction accepts it, but you must model per the adopted code edition.

How to confirm my county is supported in REScheck?

Use the DOE REScheck location dropdown or contact the DOE help desk / your building department to confirm supported locations.

Does REScheck reflect local energy amendments?

Not always — REScheck reflects standard code editions; local amendments may require manual review or adjusted assumptions.

What if my city uses a different code year than the state?

Use the code year adopted by the enforcing jurisdiction — usually the city/county. When in doubt, ask the permitting office.

Can REScheck model special local requirements (e.g., energy ratings)?

Some local programs require additional documentation beyond REScheck, such as HERS or local efficiency program forms.

How do UA tradeoffs work in REScheck?

REScheck compares modeled UA to code UA; deficits in one assembly can be offset by credits in another within allowed limits of the selected compliance path. See DOE guidance for limits.

Are slab tradeoffs allowed?

Some REScheck versions restrict slab tradeoffs — recent IECC versions also clarify slab edge rules. Check the specific REScheck edition.

Which changes give the biggest UA benefit?

Upgrading windows (lower U) or adding continuous insulation often yields high UA benefits per dollar in many projects.

How to document tradeoffs for plan review?

Provide the REScheck certificate, a one‑page tradeoff narrative, and supporting cut sheets for improved components.

Can I use tradeoffs for alterations?

Alterations are typically checked component‑by‑component and may not allow tradeoffs — confirm the path with your jurisdiction.

What if a tradeoff passes in the model but fails inspection?

Inspectors may require installed components to match modeled assumptions; if not, you may need to retrofit or resubmit.

How to integrate REScheck results with Manual J load calculations?

Ensure that Manual J inputs (insulation, window performance, infiltration) match the envelope assumptions used in REScheck to avoid oversizing equipment.

Should Manual J be run before or after REScheck?

Ideally run them in parallel early in design so envelope and equipment sizing inform each other — final Manual J should reflect the built envelope modeled in REScheck.

Will REScheck outputs change Manual J results?

Yes — changes to insulation and window performance in REScheck will alter load calculations in Manual J and thus equipment sizing.

Can one consultant prepare both REScheck and Manual J?

Yes — many HVAC or energy consultancies bundle both services to ensure consistency and faster turnaround.

Do Manual J infiltration inputs affect REScheck?

Infiltration assumptions factor into energy analysis paths; ensure consistency between models or document differences clearly.

What documentation to provide to HVAC contractors?

Provide the REScheck report, Manual J load sheets, and envelope specs so the contractor can size and recommend equipment accurately.

How often does DOE update REScheck?

DOE updates REScheck as new code cycles are adopted or to fix issues; refer to the DOE REScheck page and release notes for specific versions.

How to know which IECC year to use for my permit?

Use the code year adopted by the enforcing jurisdiction (city/county/state). When in doubt, ask the permit office directly.

Are 2024 IECC changes important for REScheck?

Yes — 2024 IECC includes updates to component rules and energy targets; consult DOE and local adoption notes for impact.

Where can I subscribe for code updates?

Subscribe to the DOE Building Energy Codes Program announcements and your state code council newsletters; many jurisdictions publish adoption timelines online.