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HVAC BTU Calculator

Estimate a basic cooling capacity range from room area.

MyToolPantry.comHVAC BTU Calculator

HVAC BTU Calculator result

ToolEnter your information below
1 Set assumptions2 Review result3 Compare or save
Scenario AAll assumptions are visible.
Primary result42,000 BTU/hrPlanning capacity
Base load estimate30,000 BTU/hrAdjusted load estimate42,200 BTU/hrPlanning capacity42,000 BTU/hrApproximate tons3.5 tonsDifference from existing systemEnter existing capacity to compare
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Formula, assumptions & limitations

Inputs used: Conditioned area (sq ft); Ceiling height (ft); Climate/insulation adjustment (%); Occupants above two; Exterior doors; Large sun-facing windows; Kitchen adjustment (BTU/hr); Existing system capacity (BTU/hr).

Method: Uses a broad area-and-ceiling-height rule, then applies the entered climate/insulation, occupancy, door, window, and kitchen adjustments.

Screening estimate only. Equipment must be selected using a qualified Manual J/load calculation that accounts for construction, leakage, ducts, humidity, orientation, and local design temperatures.

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How this tool works

The tool applies the displayed BTU-per-square-foot baseline to room area and adjusts only for the climate and room factors exposed in the form.

Limits to know

This broad screening estimate is not equipment sizing. A qualified ACCA Manual J calculation should account for construction, insulation, infiltration, ducts, humidity, orientation, occupancy, and local design temperatures before equipment selection.