HVAC Heat Load Calculator
Visual Room AC Sizing & Cooling Tonnage Estimator
Visual HVAC Sizing Tool
1
Step 1 of 4
Room Dimensions
Room Area
144 sq.ft
Total Volume: 1440 cu.ft
2
Step 2 of 4
Roof & Sun Exposure
Top Floor
Direct Sunlight on Roof
Middle Floor
Covered / Room Above
Insulated Roof
False Ceiling / Protected
Normal Outdoor Walls
Standard shade or indoor partition
Heavy Sun Exposed Walls
Direct West/South fierce sunlight
3
Step 3 of 4
Windows & Glass Area
Direct Sun Glass
High Heat
Shaded Glass
Low Heat
4
Step 4 of 4
Occupants & Internal Heat
Recommended AC Capacity
Heat Load Output
1.5 Ton
(1.5 Ton AC is recommended for optimum cooling)
Total Cooling Required (With 10% Safety Buffer)
18,450 BTU/hr
Itemized Heat Load Breakdown
Area & Volume Load:
8,640 BTU
Roof & Wall Heat Load:
4,320 BTU
Window Solar Gain:
2,100 BTU
Occupants & Door Infiltration:
1,500 BTU
Electrical Appliances:
1,023 BTU
HVAC Sizing Principle:
1 Ton of air conditioning capacity = 12,000 BTU/hr. A 10% safety buffer is included to ensure efficient cooling during extreme summer heatwaves.
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