Lake and Peninsula County is in IECC Climate Zone 7 (Very Cold). Get accurate Manual J load calculations with official ASHRAE design temperatures for Lake and Peninsula County.
Lake and Peninsula County, Alaska is classified under IECC Climate Zone 7 (Very Cold), a heating-dominated region with moist moisture conditions. With 12 ZIP codes and 1 communities, every HVAC installation in Lake and Peninsula County must use the ASHRAE design temperatures of -20°F (99% winter heating) and 80°F (1% summer cooling) for accurate Manual J load calculations.
As a heating-dominated zone, Lake and Peninsula County requires robust insulation — a minimum of R-20 in walls, R-60 in ceilings, and R-38 in floors. Windows must meet a U-factor of 0.3 or lower. These requirements ensure homes maintain comfort during the coldest -20°F design conditions.
Minimum insulation R-values and window performance for Climate Zone 7 in Lake and Peninsula County, AK.
| Building Component | Minimum Requirement | Unit |
|---|---|---|
| Ceiling / Attic Insulation | R-60 | R-value |
| Wall Insulation | R-20 | R-value |
| Floor Insulation | R-38 | R-value |
| Window U-Factor | 0.3 | BTU/hr-ft²-°F |
| Window SHGC | 0.45 | Coefficient |
| Air Infiltration | 0.15 | ACH50 |
Climate Zone 7 requires precise load calculations. Upload your Lake and Peninsula County blueprint and get a professional Manual J report in 60 seconds— first report is FREE. Pre-loaded with Lake and Peninsula County's exact design temperatures (-20°F winter / 80°F summer).
Enter your ZIP code to confirm it's in Lake and Peninsula County and get climate zone details.
Official ASHRAE design temperatures for Lake and Peninsula County, AK, used for accurate Manual J load calculations.
Minimum insulation and window requirements for Lake and Peninsula County per IECC 2021 energy code.
Climate Zone 7: Very Cold - Very cold climate with extreme winter conditions. Extreme heating requirements, minimal cooling needs.
1 cities and communities in Lake and Peninsula County share Climate Zone 7 requirements.
Compare climate zones with other counties in Alaska. Different zones require different HVAC equipment sizing.
Upload your Lake and Peninsula County blueprint and get a professional Manual J load calculation using official Zone 7 design temperatures. First report is FREE.
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