Cooling-capacity screening

AC Tonnage & Room Size Screening Calculator

Estimate a room AC capacity range from floor area, ceiling height, sunlight, occupancy and kitchen heat using a transparent screening method.

Enter your values

Example values demonstrate the method; they are not product recommendations.

Your result

Enter measured or nameplate values to calculate.

Method

Uses the ENERGY STAR floor-area capacity bands, height scaling, ±10% sun adjustment, 600 BTU/h per occupant above two and a 4,000 BTU/h kitchen adjustment.

Important limits

Screening only. Indian climate zone, insulation, glazing, air leakage, orientation and equipment design require a qualified heat-load assessment.

Technical reference

This screening calculator gives an initial AC capacity range from room conditions. It is more useful than choosing tonnage from floor area alone, but it does not replace a heat-load calculation.

Enter realistic room details

Measure usable floor area and ceiling height. Select the closest sunlight condition and include regular occupants, large windows and kitchen or equipment heat where the tool asks. Use the room's actual conditions, not the smallest possible values.

Understand the range

The suggested tonnage is a screening result. Climate, insulation, roof exposure, window direction, air leakage, appliance load and how the room is used can increase or reduce cooling demand. An oversized or undersized AC can affect comfort, cycling and energy use.

Before selecting an AC

Compare models by cooling capacity, efficiency label, operating range, installation requirements and service support. For unusual rooms, top floors, large glass areas or critical applications, obtain a professional heat-load assessment before purchase.