Buying an AC without asking the right questions can lead to wrong size, higher bills, and poor comfort. Use this checklist to compare models and make a smart purchase.
1. What Tonnage Do I Need?
Match tonnage to room size. Too small = poor cooling; too large = wasted energy and humidity issues. Use our room capacity guide—roughly 100–150 sq ft per ton for Indian conditions.
2. What Is the ISEER Rating?
Higher ISEER = better efficiency. For India, 4.5+ (5-star) is best. 3.7–4.0 (4-star) is good. See SEER, EER, ISEER explained for details.
3. Is It Inverter or Fixed-Speed?
Inverter modulates and saves 25–40% for long use. Fixed-speed is cheaper upfront. For 6+ hours daily, inverter usually pays back. Read inverter vs non-inverter.
4. Split or Window AC?
Split is quieter and more efficient; needs outdoor space. Window AC suits rentals and no-drilling cases. Compare in split vs window AC efficiency.
5. What Is the Installation Cost?
Installation is often extra. Ask for total cost including pipes, stand, and labour. Compare across dealers.
6. What Is the Warranty?
Compressor warranty (5–10 years) matters most. Check if it’s extendable and what conditions apply.
7. Does It Have a 5-Star BEE Rating?
5-star ACs use less power. Compare with 3-star vs 5-star to see if the premium is worth it for your usage.
8. Where Will the Outdoor Unit Go?
Ensure you have a suitable spot with clear airflow. Poor placement hurts efficiency. See outdoor unit placement.
9. What Is the Estimated Running Cost?
Use our AC Energy & Cost Calculator with your usage hours and tariff. Compare different models.
10. Is It Right for My Use Case?
Bedroom only? Multi-room? Rental? Open plan? Match the AC to your situation. For rentals, see best AC for rental homes.
Quick Summary Table
| Question | What to Look For |
|---|---|
| Tonnage | Match room size (100–150 sq ft/ton) |
| ISEER | 4.5+ for 5-star |
| Type | Inverter for 6+ hrs; fixed for light use |
| Installation | Included or quoted separately |
| Warranty | 5+ years compressor |
FAQs
What is the most important thing when buying AC?
Right tonnage for your room and good efficiency (ISEER/star rating). Wrong size causes comfort and cost issues.
Should I buy inverter or non-inverter AC?
Inverter if you run AC 6+ hours daily. Non-inverter can work for 2–4 hours and tight budgets.
Is 5-star AC worth the extra cost?
For heavy users, yes. Payback is usually 2–4 years. For light users, 4-star may suffice.
What questions should I ask the dealer?
Tonnage for your room, ISEER, warranty, installation cost, and availability of service.
How do I estimate AC running cost?
Use our AC Energy & Cost Calculator with tonnage, ISEER, hours, and tariff.
Can I install the AC myself?
No. Split AC needs professional installation for refrigerant, electrical, and safety. Warranty often requires authorised install.
Conclusion
Use these 10 questions as a checklist before buying. Match tonnage, check efficiency, compare running cost, and choose based on your actual usage and space.