Quality Inspector
Utility & Plumbing
AC Tonnage Calculator (2026) – Room Size Cooling Master
Expert Guide
Professional HVAC sizing tool for residential and commercial split/window air conditioners.
⚡ Quick Answer
For a 150 sq.ft room, you need a 1.0 Ton AC. If it is on the top floor with direct sun, upgrade to 1.5 Ton for durability. For HVAC consulting, visit pro.nirmansutra.com.
🛠️ How It Works
- •Enter the carpet area of your room in square feet.
- •Specify if the room is directly under a roof (sun exposure factor).
- •The tool calculates the minimum BTU requirement and converts it to Tonnage.
📐 Calculation Formula
Base Tonnage = Area (sq.ft) / 150
Adjusted Ton = Base Ton × Sun Exposure Factor
⚠️ Common Mistakes to Avoid
- ✕Buying an undersized AC — a 1.0 Ton AC in a 200 sq.ft top-floor room will never trip its compressor, tripling your electricity bill.
- ✕Ignoring door gaps — poor sealing in windows/doors lets cold air escape, making the calculation irrelevant.
🔍People Also Search / यो Calculator मा अक्सर खोजिने कुराहरू
AC tonnage calculator for room size in sq ft
Best AC brands price in Nepal 2026
1.5 Ton AC vs 1 Ton electricity bill
Inverter AC vs Non-inverter energy savings
Kotha ko lagi AC size nikalne tarika
AC buying guide for small room Nepal
Split AC installation cost Kathmandu
Top floor room cooling load calculation
Window AC vs Split AC power consumption
एसी कितने टन का लेना चाहिए?
❓ Frequently Asked Questions
For a standard 120–150 sq.ft room, 1 Ton is sufficient. However, if your room is on the top floor with direct sun, always upgrade to a 1.5 Ton AC for efficient cooling.
A modern 5-star inverter 1.5 Ton AC consumes approx 0.8–1.2 units per hour once the room is cooled. Non-inverter models consume significantly more.
Standard ACs require stabilizers to protect against high/low voltage fluctuations. However, many modern Inverter ACs come with built-in wide voltage range support.
Stop Guessing.
Start Building.
- ✕Square Feetको भ्रममा नफस्नुहोस्।(Don't get trapped in "Square Feet" rate illusions.)
- ✓Save up to 11% on materials with an accurate BOQ.
Worth NRs. 5,000
NRs. 999 🎯
Get Expert EstimateLimited Time Launch Price