Wyoming spans 3 IECC climate zones. Find your exact zone, design temperatures, and get free Manual J load calculations for any Wyoming location.
Wyoming spans 3 IECC climate zones (Zone 5B, Zone 6B, Zone 7), which means insulation requirements, design temperatures, and equipment specs vary significantly depending on location. The primary zone, Zone 5B (Cool - Dry), is heating-dominated, with winter design temperatures as low as -7°F and summer highs reaching 91°F. HVAC contractors working across Wyoming need to verify the exact climate zone for each job site — using the wrong zone data leads to oversized or undersized equipment, failed inspections, and unhappy homeowners.
Minimum insulation R-values and window specifications required by the 2021 International Energy Conservation Code for Wyoming.
| Component | Zone 5B | Zone 6B | Zone 7 |
|---|---|---|---|
| Ceiling / Attic | R-49 | R-49 | R-60 |
| Walls | R-20 | R-20 | R-20 |
| Floor | R-30 | R-30 | R-38 |
| Window U-Factor | 0.3 | 0.3 | 0.3 |
| Window SHGC | 0.4 | 0.4 | 0.45 |
Source: IECC 2021 Table R402.1.2. Requirements shown are for residential construction. Wyoming contractors must use the zone that corresponds to the job site location.
These ASHRAE design temperatures determine how Manual J load calculations size heating and cooling equipment for Wyoming homes. The winter 99% value represents the coldest temperature expected, while the summer 1% value represents the hottest.
Cool - Dry
Cold - Dry
Very Cold
Based on Climate Zone 5B (Cool - Dry), here are typical HVAC equipment specifications for Wyoming installations.
Annual Fuel Utilization Efficiency for Wyoming furnaces
Seasonal Energy Efficiency Ratio for Wyoming AC systems
Wyoming's climate zone data ensures proper equipment sizing. No more callbacks from oversized or undersized systems.
Wyoming building departments require IECC-compliant Manual J calculations. Our tool uses official Wyoming climate data.
Right-sized systems based on Wyoming climate data reduce energy costs for homeowners and improve your reputation.
Upload your Wyoming blueprint and get a professional Manual J load calculation with official climate zone data. First report is FREE.
Join 10,000+ Wyoming contractors who trust AutoHVAC for permit-ready load calculations
Get detailed climate zone information for major cities
Need Wyoming HVAC permit forms and building department contacts?
View Wyoming Permit Directory