Zone 5BCool (Zone 5)

Climate Zone 5B - Cool, Dry

Warm summers and cold winters with low humidity. High heating loads. This climate zone encompasses parts of Colorado, Wyoming, Utah, Nevada and includes major cities like Denver, Salt Lake City, Cheyenne, Reno.

Design Temperatures

Winter Design Temperatures

-5°F to 15°F

Used for heating load calculations and equipment sizing

Summer Design Temperatures

80°F to 90°F

Used for cooling load calculations and equipment sizing

Heating & Cooling Degree Days

Heating Degree Days (HDD)

4,500 - 7,000

Base 65°F. Higher numbers indicate more heating requirements and longer heating seasons.

Cooling Degree Days (CDD)

250 - 1,000

Base 65°F. Higher numbers indicate more cooling requirements and longer cooling seasons.

HVAC System Considerations

Key Considerations

  • Very high heating loads
  • Limited cooling needs
  • Altitude effects
  • Large temperature swings
  • Equipment derating

Common Equipment

  • High-efficiency gas furnaces
  • Boilers
  • Heat pumps (cold climate)
  • Radiant heating

Energy Code Requirements

Equipment Efficiency

  • SEER 13+ minimum
  • HSPF 8.2+ for heat pumps
  • AFUE 90+ for furnaces
  • High-performance building envelope

Insulation Requirements

Walls:R-19 to R-21
Ceiling:R-49 to R-60
Floor:R-25 to R-30

Major Cities in Zone 5B

States with Zone 5B Areas

Quick Reference

Zone:5B
Temperature:Cool
Moisture:Dry (B)
States:4
Cities:4

Calculate Load

Use our load calculators with the design temperatures and requirements specific to Zone 5B.