Zone 2BHot (Zone 2)
Climate Zone 2B - Hot, Dry
Hot summers with low humidity. Moderate heating needs with large temperature swings. This climate zone encompasses parts of Arizona, California, Nevada, New Mexico, Texas and includes major cities like Albuquerque, El Paso, Bakersfield, Reno.
Design Temperatures
Winter Design Temperatures
20°F to 35°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)
2,000 - 4,000
Base 65°F. Higher numbers indicate more heating requirements and longer heating seasons.
Cooling Degree Days (CDD)
2,000 - 4,500
Base 65°F. Higher numbers indicate more cooling requirements and longer cooling seasons.
HVAC System Considerations
Key Considerations
- •High cooling loads
- •Moderate heating needs
- •Large diurnal temperature swings
- •Dust and UV protection
- •Low humidity year-round
Common Equipment
- ✓Heat pumps
- ✓Evaporative cooling in appropriate areas
- ✓Two-stage systems
- ✓Gas furnaces with AC
Energy Code Requirements
Equipment Efficiency
- ⚠SEER 13+ minimum
- ⚠HSPF 7.7+ for heat pumps
- ⚠Radiant barriers
- ⚠Window solar heat gain limits
Insulation Requirements
Walls:R-13 to R-19
Ceiling:R-30 to R-38
Floor:R-13 to R-19
Major Cities in Zone 2B
States with Zone 2B Areas
Quick Reference
Zone:2B
Temperature:Hot
Moisture:Dry (B)
States:5
Cities:5
Calculate Load
Use our load calculators with the design temperatures and requirements specific to Zone 2B.