Sizing an air conditioner in Mumbai? Because Mumbai has a hot and humid coastal climate, rooms need a different AC size than in a temperate region. The calculator below is pre-set to Mumbai’s climate — enter your room’s area for an instant tonnage. Mumbai rarely hits extreme temperatures, but its coastal humidity is relentless almost year-round. Much of an AC’s work in Mumbai is dehumidification rather than pure cooling, which raises the effective load — so size for the humidity, not just the thermometer.
🧊 Find the Right AC Size for Your Room — in Tons & BTU
Convert room size (sq ft or m²) to the exact AC tonnage you need — 0.5, 1, 1.5, 2 Ton and up. ACCA Manual-J inspired, in tons, BTU/hr and kW, for the US, UK, Europe, India, UAE, Saudi Arabia & Australia.
🌍 Prefer metric? Switch units here
🏠1. Space Type
📐2. Floor Area & Ceiling
Range: 50 – 10,000 sq ft
Range: 7 – 20 ft
Range: 0 – 50 people
🌍3. Country / Climate
The base factor assumes a 30 °C / 86 °F design day. Change the chip above to match your region.
🧱4. Insulation
☀️5. Sun Exposure
🪟6. Windows / Glazing
➕Advanced loads (kitchen, appliances, exhaust) — optional
Wattage × 3.4 = BTU/hr. e.g. 500 W ≈ 1,700 BTU/hr
For office IT, gym gear, lab equipment
AC Tonnage Chart for Mumbai by Room Size
These are typical AC sizes for Mumbai’s climate, for a room with an 8-foot ceiling and average insulation. Larger, top-floor, or west-facing rooms may need the next size up:
| Room Size | Recommended AC | Approx. BTU/hr |
|---|---|---|
| 150 sq ft | 0.5 Ton | 3,920 BTU/hr |
| 250 sq ft | 0.75 Ton | 6,534 BTU/hr |
| 400 sq ft | 1 Ton | 10,454 BTU/hr |
| 600 sq ft | 1.5 Ton | 15,682 BTU/hr |
| 800 sq ft | 2 Ton | 20,909 BTU/hr |
| 1,000 sq ft | 2.5 Ton | 26,136 BTU/hr |
Sizing AC for Mumbai’s Climate
In humid Mumbai, an inverter unit with a strong dry/dehumidify mode keeps rooms comfortable at a higher, cheaper thermostat setting. The calculator applies Mumbai’s climate factor automatically; you can still fine-tune ceiling height, insulation, sun exposure, and room type above to match your exact space. Remember that an oversized AC cools quickly but short-cycles and dehumidifies poorly — matching the tonnage to the room gives better comfort and lower running costs.
Frequently Asked Questions — Mumbai
What size AC do I need for a bedroom in Mumbai? A typical 150 sq ft bedroom in Mumbai needs about a 0.5 Ton AC (3,920 BTU/hr). Larger rooms scale up per the chart above.
Why does Mumbai need a bigger AC than a mild climate? Mumbai’s hot and humid coastal climate raises the cooling load, so the same room needs more capacity than it would in a temperate region — the calculator applies that adjustment automatically.
How many BTU for a 150 sq ft room in Mumbai? Around 3,920 BTU/hr under standard conditions. Adjust ceiling height and sun exposure in the calculator for a precise figure.
Related: refrigeration cycle diagram and components explained.
Estimates vary by contractor. Compare free quotes from licensed local pros before you commit. Request a quote →
High-efficiency systems may qualify for utility rebates and federal or state incentives. Find current programs at ENERGY STAR & DSIRE.
Figures are reviewed by the Refcon HVAC engineering team using U.S. DOE, ENERGY STAR & ACCA Manual J data. Estimates only — confirm with a licensed pro.
