Case Study 02 · System Comparison
2000 CMH — InAir ERV+DX vs InAir ERV vs Decentralised Competitor
For large villas and bungalows (6,000–8,000 sq ft), fresh air requirement typically reaches ~2,000 CMH. This analysis compares three approaches head-to-head on energy costs, installation complexity, and Indian suitability.
₹24K
Monthly savings — ERV+DX vs no ERV
85%
Max AC load reduction — ERV+DX
1 unit
vs 4–8 units required by competitor brands
HVAC Load Without ERV
~10.2 kW
Fresh air load (~3 TR)
₹30,600
Monthly cost (at ₹10/kWh)
Energy Comparison — Monthly
| System | Monthly Cost | Monthly Saving | Annual Saving |
|---|---|---|---|
| InAir ERV+DX (2000 CMH) | ₹6,000 | ₹24,000 | ₹2.9 lakh |
| InAir ERV (2000 CMH) | ₹14,400 | ₹16,000 | ₹1.9 lakh |
| Decentralised competitor (4–8 units) | ₹18–21,000 | ₹9–12,000 | ₹1.2 lakh |
| No ERV (baseline) | ₹30,600 | — | — |
Product Comparison Table
| Parameter | InAir ERV+DX | InAir ERV | Decentralised Competitor |
|---|---|---|---|
| System type | Centralized | Centralized | Decentralized |
| Units required | 1 unit | 1 unit | 4–8 units |
| DX Cooling | ✓ Yes | ✗ No | ✗ No |
| Dehumidification | ✓ Active | ✗ No | ✗ No |
| AC Load Reduction | 70–85% | 50–60% | 30–50% |
| CO₂-based DCV | ✓ Yes | ✓ Yes | ✗ Not integrated |
| IAQ Sensors | ✓ Full suite | ✓ Full suite | ✗ Not integrated |
| PUF Insulation | ✓ Yes | ✓ Yes | ✗ Not standard |
| EC Motors | ✓ High efficiency | ✓ Yes | Mixed / AC motors |
| Indian conditions | ✓ Designed for | ✓ Designed for | Not calibrated for Indian conditions |
| Installation | Clean centralized | Clean centralized | Multiple penetrations |
| Maintenance | Single point | Single point | Multiple service points |
"At 2000 CMH, ventilation is no longer a small-room problem — it becomes a system design problem. A single intelligent system consistently outperforms multiple independent units."
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