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HVAC Size Calc - Free HVAC Load Calculators
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HVAC Size Calc - Free HVAC Load Calculators
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HVAC Load Calculator
📋 HVAC Load Calculator
Home Size (sq ft)
Total conditioned square footage
Number of Stories
1 story
2 stories
3+ stories
Climate Zone
Very Hot — Zone 1 (South FL, HI)
Hot — Zone 2 (TX, AZ, LA)
Mixed — Zone 3 (GA, NC, TN)
Mixed-Humid — Zone 4 (MD, VA, IN)
Cool — Zone 5 (OH, IL, MA)
Cold — Zone 6 (MN, MT, WI)
Very Cold — Zone 7 (AK, ND)
Insulation Quality
Poor — older home, minimal insulation
Average — some insulation
Good — modern standards
Excellent — well sealed
Superior — Energy Star certified
Number of Windows
Few (1-4 windows)
Average (5-10 windows)
Many (11-16 windows)
Lots (17+ or large windows)
Number of Occupants
1 person
2 people
3 people
4 people
5+ people
📋 Calculate HVAC Load
0 tons
Cooling Load (AC)
0
❄️ Cooling tons required
0k BTU
🔥 Heating BTU/hr required
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Important:
This is an approximation based on simplified Manual J methodology. For accurate sizing, always have a licensed HVAC contractor perform a full Manual J load calculation before purchasing equipment.
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