📏 Buying Guide
How to Choose the Right AC Tonnage
Wrong AC size means your room never gets cool or you overpay on electricity forever. Here's the correct way to calculate for Samastipur's extreme heat.
📅 July 2026✍️ Repair Guru Team⏱️ 5 min read
Ek bahut common mistake jo Samastipur ke ghar mein hoti hai: 1 ton AC lena ek 200 sqft room ke liye kyunki dealer ne kaha "kaafi hai." June aata hai, AC lagataar chalta rehta hai, room thanda nahi hota, aur electricity bill ₹4,000 par pahunch jaata hai. Nahi — kaafi nahi tha.
Dusri mistake: 2 ton AC lena ek 100 sqft room mein. AC room ko itna jaldi thanda kar deta hai ki compressor baar baar on-off hoti hai (short cycling), humidity control nahi hoti, aur unit ke parts zyada wear hote hain.
Basic Formula — Bihar Climate Ke Liye
| Room Size | General India | Samastipur/Bihar
(Adjust for 44°C+) |
|---|
| Up to 100 sq ft | 0.75–1 ton | 1 ton |
| 100–140 sq ft | 1–1.2 ton | 1.5 ton |
| 140–180 sq ft | 1.2–1.5 ton | 1.5 ton |
| 180–220 sq ft | 1.5–1.8 ton | 2 ton |
| 220–280 sq ft | 2 ton | 2–2.5 ton |
Bihar ke liye standard calculation se ek size UP karo — kyunki 44–46°C outdoor temperature mein AC ki effective capacity drop hoti hai. Manufacturers rate their ACs at 35°C ambient — Samastipur's peak is 10°C above that.
Factors That Change the Calculation
➕ Add Cooling Load For These
- West-facing room: +0.25 ton (afternoon sun adds significant heat)
- Top floor / terrace below: +0.25–0.5 ton (roof absorbs heat all day)
- More than 2 people regularly in room: +0.1 ton per person
- Large windows without heavy curtains: +0.15–0.25 ton
- Kitchen-adjacent room: +0.25 ton
- Old construction with thin walls (no insulation): +0.25 ton
➖ Reduce Load For These
- North-facing room: No direct sun — standard calculation okay
- Ground floor with shade: -0.1 ton
- Thick walls, good insulation: Standard calculation
- Only 1–2 people use the room: Standard calculation
Inverter vs Non-Inverter — Does It Change Tonnage?
No. Tonnage selection logic is the same. An inverter AC of 1.5 ton cools the same room as a non-inverter 1.5 ton — it just does it using 30–50% less electricity by varying compressor speed. Always choose inverter, especially in Samastipur where ACs run 10+ hours daily in summer.
💡 5-Star Inverter Math for Samastipur: A 5-star 1.5-ton inverter AC running 10 hours daily uses roughly 120–140 units/month. A non-inverter 3-star same size uses 200–230 units. At ₹6/unit, that's ₹480–₹540 saved per month — or ₹2,400–₹2,700 over a 5-month summer. The price premium pays back in 2–3 years.
🔗 Related Service
AC Installation in Samastipur
Correct installation by certified technicians — bracket, pipe routing, power wiring done properly. From ₹1,200.
View AC Installation Service →
Frequently Asked Questions
Samastipur mein 1 ton AC kitne sqft ke liye sahi hai?
Bihar ke extreme summer mein 1 ton sirf 100 sq ft tak cool kar sakta hai reliably. 120–140 sq ft ke liye 1.5 ton better hai. Standard 120 sq ft per ton guideline Delhi ke liye hai — Bihar mein zyada heat hai.
Kya bada AC lena better hota hai?
Nahi — oversized AC short cycle karta hai. Room jaldi thanda hota hai, compressor band ho jaata hai, lekin humidity remove nahi hoti aur room muggy lagta hai. Sahi size = efficient cooling + humidity control.
Inverter AC lena chahiye ya non-inverter?
Samastipur ke liye hamesha inverter. 10+ ghante daily use mein non-inverter ₹2,500–₹3,000 extra electricity cost karta hai per summer. 5-star inverter is the best long-term choice.
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