Fresh Air Ventilation Myths, Answered

Your AC pulls warm air from your room, cools it through a refrigerant coil, and pushes it back in. The same air. Over and over. Zero fresh air enters. Zero stale air exits. AC was specifically designed to be a closed-loop cooling system — bringing in outdoor air was never part of the design.

Windows closed 90% of the time in Indian cities. When open, they bring in PM2.5, pollen, mosquitos, noise, and outdoor heat — all of which your AC then has to compensate for. Inair provides continuous, filtered, conditioned fresh air exchange without opening a single window. You get the benefits without the trade-offs.

Inair ERV units draw 25–60 watts — comparable to a light bulb. The ERV heat exchanger recovers 80–90% of thermal energy from outgoing stale air, meaning your AC doesn't have to cool raw outdoor air from scratch. Our Mumbai case study shows 1.2–1.9 year payback when factoring in AC energy savings and potential AC tonnage reduction. The net impact for most homes is near-zero to slightly positive.

Every Inair duct run is routed entirely through the false ceiling — the same ceiling void your AC's refrigerant lines and electrical conduits already pass through. Zero wall damage. Zero tile drilling. Zero visible pipes anywhere in the living space. Our flat-profile duct system (132×30mm) is specifically designed to sit flush inside ceiling voids and tight false ceiling cavities. Diffusers are flush-mounted into the ceiling and look identical to AC grilles. From inside your home, there is nothing to see. The only external element is a small louvred wall grille where fresh air enters from outside — comparable in size to an AC outdoor unit mounting hole.

Every Inair ERV unit filters incoming air through a Pre-Filter and MERV-13 / HEPA-13 — the same standard used in hospitals. MERV-13 / HEPA-13 captures 99%+ of PM2.5, pollen, dust mites, and most airborne bacteria before they enter your space. The filtered air you breathe is cleaner than most outdoor air on a non-peak pollution day — and far cleaner than the recirculated, increasingly stale air your AC currently provides.

Air purifiers filter and recirculate the same indoor air — they do not introduce fresh air or remove CO₂. As CO₂ builds in a sealed room (from breathing, cooking, and body heat), an air purifier does nothing about it. Inair continuously exhausts stale air including CO₂ while bringing in fresh outdoor air. The two products solve completely different problems. Many Inair customers use both — the purifier works on existing indoor air while Inair replaces it.

Inair units operate at 25–30 decibels. A whisper is 30dB. Your AC fan runs at 38–45dB. A typical bathroom exhaust fan runs at 55–60dB. Inair is specifically engineered with EC motors, acoustic flexible ducts, and anti-vibration mounts to operate below the threshold of conscious perception. The most common feedback from our customers: "I forget it's running."

The majority of Inair's installations are in high-rise apartments — floors 5, 10, 15, 25 and above, across Hyderabad, Mumbai, and Bangalore. Our ceiling-mounted ERV units are specifically designed for apartment footprints. The wall penetration is small, sealed against weather and insects, and the outdoor air quality actually improves at height — away from ground-level vehicular pollution. Our installation team handles everything safely regardless of floor.

At 2000 CMH scale, a single centralized system consistently outperforms multiple smaller units. Multiple units mean multiple wall penetrations, multiple wiring points, multiple service visits, no coordinated air quality control, higher cumulative fan power consumption, and no integrated DX cooling. Our comparison analysis shows that decentralised competitor multi-unit setups at 2000 CMH typically save only ₹9,000–₹12,000 per month vs ₹24,000 per month for InAir ERV+DX — despite similar or higher total cost.