Zone 1AVery Hot (Zone 1)
Climate Zone 1A - Very Hot, Humid
Very hot summers with high humidity year-round. Minimal heating requirements. This climate zone encompasses parts of Florida, Hawaii, Louisiana, Texas and includes major cities like Miami, Key West, Honolulu, Brownsville.
Design Temperatures
Winter Design Temperatures
35°F to 50°F
Used for heating load calculations and equipment sizing
Summer Design Temperatures
95°F to 105°F
Used for cooling load calculations and equipment sizing
Heating & Cooling Degree Days
Heating Degree Days (HDD)
0 - 2,000
Base 65°F. Higher numbers indicate more heating requirements and longer heating seasons.
Cooling Degree Days (CDD)
3,500 - 5,000
Base 65°F. Higher numbers indicate more cooling requirements and longer cooling seasons.
HVAC System Considerations
Key Considerations
- •Year-round cooling priority
- •Dehumidification critical
- •Hurricane-resistant equipment
- •Salt air corrosion protection
- •Minimal heating capacity needed
Common Equipment
- ✓High-efficiency air conditioners
- ✓Heat pumps with enhanced dehumidification
- ✓Whole-house dehumidifiers
- ✓Variable refrigerant flow systems
Energy Code Requirements
Equipment Efficiency
- ⚠SEER 14+ minimum for air conditioners
- ⚠Enhanced moisture control
- ⚠Duct sealing requirements
- ⚠Fenestration U-factor limits
Insulation Requirements
Walls:R-13 to R-15
Ceiling:R-30 to R-38
Floor:R-13 (if applicable)
Major Cities in Zone 1A
Quick Reference
Zone:1A
Temperature:Very
Moisture:Moist (A)
States:4
Cities:4
Calculate Load
Use our load calculators with the design temperatures and requirements specific to Zone 1A.