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BTU Calculator
❄️ Professional HVAC Sizing
Precise BTU Requirements & Equipment Sizing
Powered by Construction Corps
✅ Standalone Version
- This version works directly in any browser without needing a server. All ZIP data is embedded.
Room Specifications
Room Length (ft + in)
ft
in
Example: 12 ft 4 in → auto-converts to 12.33 ft
Room Width (ft + in)
ft
in
Example: 10 ft 0 in → auto-converts to 10 ft
Ceiling Height (ft)
Number of People
ZIP Code
Auto-sets climate zone and sun exposure
Room Type
Bedroom/Bath
Living Room
A.D.U. (Accessory Dwelling Unit)
Kitchen
Addition/Extension
Calculation Mode
Standalone - New Equipment Only
Addition - Compare with Existing System
📊 Existing HVAC System Information
Enter your current system details to see if it can handle the additional load
Existing System Capacity
Tons
BTU/hr
Capacity Value
Current Load (Optional)
Leave 0 to assume full capacity
System Age (years)
Older systems lose 5-15% efficiency
System Condition
Excellent - Well maintained
Good - Regular maintenance
Fair - Some wear
Poor - Needs service
ZIP data ready! Default: 33765 (Clearwater, FL) - Hot climate (Zone 1), High sun (20% add)
Preferred Equipment Type
Mini-Split Systems
High efficiency, quiet operation
Split Systems
Traditional ducted systems
Show All Options
Compare all available systems
Calculate BTU & Find Equipment
BTU Calculation Results
