Zone 2AHot (Zone 2)
Climate Zone 2A - Hot, Humid
Hot summers with high humidity. Mild winters requiring some heating. This climate zone encompasses parts of Louisiana, Mississippi, Alabama, Georgia, Texas, Florida and includes major cities like Houston, New Orleans, Mobile, Savannah.
Design Temperatures
Winter Design Temperatures
15°F to 35°F
Used for heating load calculations and equipment sizing
Summer Design Temperatures
90°F to 98°F
Used for cooling load calculations and equipment sizing
Heating & Cooling Degree Days
Heating Degree Days (HDD)
1,500 - 3,000
Base 65°F. Higher numbers indicate more heating requirements and longer heating seasons.
Cooling Degree Days (CDD)
2,500 - 4,000
Base 65°F. Higher numbers indicate more cooling requirements and longer cooling seasons.
HVAC System Considerations
Key Considerations
- •High cooling loads with humidity control
- •Moderate heating requirements
- •Mold and moisture management
- •Hurricane considerations in coastal areas
- •Year-round humidity concerns
Common Equipment
- ✓Heat pumps with backup heat
- ✓High-efficiency AC with dehumidification
- ✓Dual-fuel systems
- ✓Whole-house dehumidifiers
Energy Code Requirements
Equipment Efficiency
- ⚠SEER 13+ minimum
- ⚠HSPF 7.7+ for heat pumps
- ⚠Moisture control strategies
- ⚠Duct leakage testing
Insulation Requirements
Walls:R-13 to R-15
Ceiling:R-30 to R-38
Floor:R-13 to R-19
Major Cities in Zone 2A
Quick Reference
Zone:2A
Temperature:Hot
Moisture:Moist (A)
States:6
Cities:5
Calculate Load
Use our load calculators with the design temperatures and requirements specific to Zone 2A.