HVAC Load Calculation by State

Temperature Zones

• 1: Very Hot (Summer design temp 95°F+)
• 2: Hot (Summer design temp 90-95°F)
• 3: Warm (Summer design temp 85-90°F)
• 4: Mixed (Summer design temp 80-85°F)
• 5: Cool (Summer design temp 75-80°F)
• 6: Cold (Summer design temp 70-75°F)
• 7: Very Cold (Summer design temp 65-70°F)
• 8: Subarctic (Summer design temp under 65°F)

Moisture Levels

• A: Moist (High humidity, frequent precipitation)
• B: Dry (Low humidity, arid conditions)
• C: Marine (Coastal, moderate humidity)

Example: Zone 3A means warm and moist climate, typical of southeastern states. Zone 2B means hot and dry, common in southwestern desert regions.