AC tonnage calculator
Enter the room size and basic conditions to understand a starting AC capacity range. This is not an engineering heat-load calculation or a final recommendation.
View listings around the 1.5 TR class
Starting room estimate for 150 sq ft.
- Room area
- 150 sq ft
- Base calculation
- 18,000 BTU/h
- Applied conditions
- 0% adjustment
Final capacity depends on a site review. This is not an engineering heat-load report.
Basis: Hitachi India room-capacity guidance ↗ states 120 BTU per sq ft. Sunlight, floor, ceiling and occupancy adjustments are starting assumptions used by this website, not Hitachi engineering recommendations. This calculator is limited to ordinary rooms from 40–300 sq ft. Source checked on 2026-08-28.
Read the result as a range
Browse capacity listings around the range. A decimal result is not a product model.
Share the room conditions
Mention glass frontage, west-facing sun, a top floor, kitchen heat or an open doorway in your enquiry.
Confirm after a site review
The electrical point, drain, outdoor-unit location and piping route matter as much as capacity.