Louisiana is in IECC Climate Zone 2A (Hot - Humid). Get accurate Manual J load calculations with official design temperatures and IECC requirements.
Louisiana falls entirely within IECC Climate Zone 2A (Hot - Humid), making it a cooling-dominated state where air conditioning capacity, SEER ratings, and humidity control drive HVAC sizing decisions. With a winter 99% design temperature of 32°F and a summer 1% design temperature of 95°F, Louisiana HVAC contractors must size systems for a 63°F temperature swing between extreme winter and summer conditions. Proper Manual J load calculations using these design temperatures are essential for code-compliant, right-sized installations that avoid callbacks and comfort complaints.
Minimum insulation R-values and window specifications required by the 2021 International Energy Conservation Code for Louisiana.
| Component | Zone 2A |
|---|---|
| Ceiling / Attic | R-30 |
| Walls | R-13 |
| Floor | R-13 |
| Window U-Factor | 0.4 |
| Window SHGC | 0.25 |
Source: IECC 2021 Table R402.1.2. Requirements shown are for residential construction.
These ASHRAE design temperatures determine how Manual J load calculations size heating and cooling equipment for Louisiana homes. The winter 99% value represents the coldest temperature expected, while the summer 1% value represents the hottest.
Hot - Humid
Based on Climate Zone 2A (Hot - Humid), here are typical HVAC equipment specifications for Louisiana installations.
Annual Fuel Utilization Efficiency for Louisiana furnaces
Seasonal Energy Efficiency Ratio for Louisiana AC systems
Louisiana's climate zone data ensures proper equipment sizing. No more callbacks from oversized or undersized systems.
Louisiana building departments require IECC-compliant Manual J calculations. Our tool uses official Louisiana climate data.
Right-sized systems based on Louisiana climate data reduce energy costs for homeowners and improve your reputation.
Upload your Louisiana blueprint and get a professional Manual J load calculation with official climate zone data. First report is FREE.
Join 10,000+ Louisiana contractors who trust AutoHVAC for permit-ready load calculations
Get detailed climate zone information for major cities
Need Louisiana HVAC permit forms and building department contacts?
View Louisiana Permit Directory