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Safe · Sustainable · Intelligent · Pan-India

Fresh Air Ventilation for Indian Homes & Buildings

The air in your AC room hasn't changed since you walked in.

Air conditioning cools the same stale air in a loop. Inair continuously replaces it — drawing fresh outdoor air in, filtering it clean, and pushing stale air out. Silently. Always. For every room.

Get free site survey How it works ↓
Best results during construction or renovation
Inair systems are best installed when your home is under construction or undergoing renovation — ducting is concealed cleanly and costs are lowest. Already done up your interiors? We still have solutions — see options below →
5,000+Homes ventilated
4.9Google rating
10–12 daysTypical install
₹0Survey cost
Image of a South Asian family reading together in a bright modern living room.
Revita · Ventura · RHP
80–90%
Pre-conditioning efficiency
Fresh 24/7
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Already have a home?

Done up your interiors? Home fully finished?
We still have a solution for you.

Inair works best during construction or renovation — but we've successfully installed in fully furnished, occupied homes too. Compact wall-mount units, minimal visible ducting, one-day installation. It's more possible than you think. Talk to our engineers — no commitment, just an honest conversation about what's feasible in your home.

15,000LAir we breathe daily — yet nobody asks what's in it
8×Indoor air more polluted than outdoor — US EPA
90%Of our lives spent indoors
MERV-13 / HEPA-13Filtration standard on every Inair ERV unit
1.2 yrsPayback period — Mumbai 4000 sft case study
₹24K/moEnergy savings — 2000 CMH ERV+DX vs no ERV
15,000LAir we breathe daily — yet nobody asks what's in it
8×Indoor air more polluted than outdoor — US EPA
90%Of our lives spent indoors
MERV-13 / HEPA-13Filtration standard on every Inair ERV unit
1.2 yrsPayback period — Mumbai 4000 sft case study
₹24K/moEnergy savings — 2000 CMH ERV+DX vs no ERV
The Problem

You've been living
with bad air and
calling it comfort.

Here's what your AC actually does: it pulls warm air from your room, cools it, and pushes it back in. Same air. Over and over. No fresh air enters. No stale air leaves.

Every hour you're inside with windows shut, CO₂ builds, moisture traps, allergens circulate. You don't smell it happening. You just feel it — in the fatigue, the heaviness, the mornings where you wake up more tired than when you slept.

A room with AC and closed windows has no mechanism for fresh air. At all. That's not a bug in your AC — it's by design. AC was never meant to do that job.
8×
Indoor air can be 8× more polluted than outdoor air — in sealed, AC-cooled homes
US Environmental Protection Agency
90%
Of our time is spent indoors. Most people never consider what they're breathing
WHO global study on indoor environments
0 L
Fresh outdoor air entering a sealed AC room per minute. By design — AC was never built for air exchange
How split ACs work
20%
Drop in cognitive performance in rooms with CO₂ above 1000ppm — that's a sealed bedroom or home office
Harvard T.H. Chan School of Public Health
The Solution

What if your home
felt like a window
was always open?

Inair works while you sleep, work, cook, and live — silently pulling fresh outdoor air in through a wall-mounted unit, filtering it clean, distributing it to every room, and exhausting stale air back outside.

Your AC cools. Inair renews. Together.
Fresh outdoor air in
Filtered, conditioned outdoor air supplied continuously to every room, 24 hours a day.
Stale indoor air out
CO₂, moisture, odours, and airborne pollutants continuously exhausted outside.
See how it works — 5 steps →
Inair ERV fresh air ventilation unit — works with existing AC system in Indian apartments
Works with your existing AC Zero AC impact
The real comparison

Air purifiers, ACs
and exhaust fans are
not the same thing.

Most "clean air" products work on the same indoor air. Inair does the one thing they can't — actually replace it with fresh outdoor air, continuously. Here's the honest comparison.

OPTION 01
Air Purifiers

Filter and recirculate the same indoor air. Stale air stays stale — just slightly cleaner. CO₂ keeps building. No fresh air enters. No stale air leaves.

No fresh air
OPTION 02
Exhaust Fans

Push air out without bringing fresh air in. Creates pressure imbalance that pulls in unfiltered air through gaps — uncontrolled and unfiltered.

No replacement
OPTION 03
AC Systems

Cool and circulate the existing indoor air. Comfortable temperature — same stale air. CO₂ builds, moisture accumulates. AC was never designed for ventilation.

No ventilation
THE INAIR WAY
Inair Ventilation

Continuously brings filtered fresh outdoor air in and pushes stale indoor air out. CO₂ drops. Allergens exit. Air quality improves — room by room, hour by hour.

Complete air replacement
CapabilityAir PurifierExhaust FanFresh Air Supply Fan
“air optimiser”		AC SystemInair ERV
Brings in fresh outdoor air✗
Recirculates only
–
Only by suction
✓
Yes
✗
Recirculates only
✓
Yes, continuously
Exhausts stale air out✗
No
✓
Yes
✗
No path out
✗
No
✓
Yes, balanced
Balanced supply and extract✗
N/A
✗
Extract only
✗
Supply only
✗
N/A
✓
Yes, matched pair
Works with doors and windows shut✓
Yes
✗
Needs an inlet
✗
Needs an outlet
✓
Yes
✓
Yes
Removes CO₂✗
No
–
Only if air can enter
–
Only if air can leave
✗
No
✓
Yes
Filters PM2.5 before air enters–
Cleans indoor air
✗
No
–
Basic filter only
✗
No
✓
MERV-13 / HEPA-13
Controls incoming humidity✗
No
✗
No
✗
Raw outdoor humidity
–
Cools, dries a little
✓
Yes, ERV or RHP
Tempers incoming air✗
N/A
✗
N/A
✗
Outdoor temperature, raw
✗
N/A
✓
80–90% heat recovery
Raises AC load✗
Slightly
✓
Yes, pulls in hot air
✓
Yes, untempered air
✗
It is the AC
✗
Usually reduces it
Reaches every room✗
One room per unit
✗
One room
✗
One room
–
Rooms with a unit
✓
Ducted to every room
Runs unattended, 24/7–
Manual or timer
–
Manual
–
Manual
–
Manual
✓
Continuous, sensor-led
The row that separates the last two columns is “exhausts stale air out”. A fresh air supply fan — sold as an air optimiser, fresh air fan or positive input unit — pushes outdoor air in and stops there. There is no return path, so the room goes positive and the stale air it displaced has to find its own way out through a door, a window or a gap. Close the house up and the supply fan is pushing against itself. It also delivers that air at whatever temperature and humidity is outside, untempered, which is why it lands on your air conditioner rather than beside it. A balanced ERV moves the same volume in and out, through matched ducts, with the heat recovered between the two streams.

Air purifiers and Inair solve different problems and work well together. A purifier handles existing indoor particles; Inair replaces the air entirely. Many Inair customers run both.

How it works

Five steps.
One continuous breath.

No jargon. Here's exactly what happens every minute Inair is running — from outside air entering the wall to clean, conditioned, dehumidified air reaching every room you breathe in. Steps 03 and 04 are the stages no other product category does.

01
Intake
Fresh outdoor air is drawn in through a compact sealed wall port — louvred to block rain, insects, and debris. Just a 50mm wall penetration. No major civil work required.
Outside → Unit
02
Filter
Incoming outdoor air passes through a Pre-Filter trapping coarse dust, then MERV-13 / HEPA-13 filtration — capturing 99%+ of PM2.5, pollen, allergens, and bacteria (MERV-13 / HEPA-13); upgrade to HEPA-13 for 99.97%+ capture in high-AQI cities before anything enters your home.
Pre-Filter + MERV-13 / HEPA-13 · grade by city
03
Pre-Condition
ERV heat exchanger. Filtered fresh air passes through the plate heat exchanger — recovering 80–90% of thermal energy from outgoing stale air. Fresh air arrives very close to room temperature so your AC load barely moves.
Plate heat exchanger · 80–90% recovery
04
Active Heat Pump
RHP units only. An integrated refrigerant heat pump (R410A) actively cools and dehumidifies the incoming air — locking it to a precise 22–28°C setpoint regardless of outdoor temperature or monsoon humidity. Eliminates latent load on your AC entirely.
R410A · Active cooling + dehumidification · 22–28°C
05
Supply
Clean, conditioned, dehumidified air flows to every room via concealed ducting and diffusers. Every room. Continuously. At whisper volume — under 30 dB. Stale air simultaneously exits through a separate exhaust path, transferring its energy in step 03 before leaving.
Unit → Every room · <30dB · Stale air exhausted
Not sure whether MERV-13 or HEPA-13 is right for your city?

Filter grade requirements differ significantly by location. Delhi winters may need HEPA-13 for extreme PM2.5 spikes. Hyderabad construction seasons may need a different approach. Coastal cities like Mumbai need humidity-resistant media. Tell us your city and building type — our engineer will recommend the right filter grade for your specific air quality challenge.

Steps 03 and 04 are what separate Inair from a simple exhaust fan or air purifier. The ERV plate heat exchanger (step 03) recovers 80–90% of thermal energy so your AC isn't cooling raw outdoor air from scratch. On RHP units, step 04 adds an active heat pump that actively cools and dehumidifies to a precise 22–28°C — particularly important during Mumbai and Chennai monsoons where latent load is the main challenge.

What changes

Our customers stop
noticing the air.
That's the point.

You don't notice good air. You only notice bad air. Here's what customers experience in the first week — and what quietly improves for years after.

Sleep that actually restores
CO₂ builds in sealed bedrooms overnight. Inair keeps it under 800ppm all night. The difference shows in your mornings.
CO₂ target <800ppm
Focus that doesn't fade by 3pm
Cognitive performance drops 20–50% in poorly ventilated rooms. If your office feels foggy by afternoon — it's your air, not you.
Harvard research
Children breathing clean air. Always.
Their lungs are developing. PM2.5, allergens, stale air hit them harder. Inair keeps every room clean — not just the one with the air purifier.
Full home coverage
Allergies with nowhere to hide
AC recirculates the very allergens that trigger reactions. Inair continuously replaces indoor air, reducing pollen, dust mites, and pet dander.
Continuous air exchange
Your AC bill stays flat
ERV pre-conditioning recovers thermal energy from outgoing stale air. You're not cooling outdoor air from scratch. Net impact: near-zero.
25–60W draw · ERV recovery
Built for Indian conditions
42°C Hyderabad summers. 90% monsoon humidity. Delhi AQI spikes. Every Inair system is calibrated for Indian air — not European comfort norms.
Indian climate tested
Questions

The questions
you're already
thinking.

We don't dodge them. Every question below is worded exactly how a skeptical buyer asks it.

Book free site survey →
No. Your AC and Inair do entirely different jobs. AC cools the air you already have. Inair replaces it with fresh outdoor air. They work side by side. Every Inair system is designed to run alongside your existing AC — Voltas, Daikin, Blue Star, LG, Samsung — without increasing electricity load. In fact, our Mumbai case study shows 10–20% AC tonnage can often be reduced.
The exact opposite. Every Inair ERV unit has a Pre-Filter and MERV-13 / HEPA-13 filtration that removes PM2.5, pollen, dust, and allergens before air enters your home. The air you breathe after filtering is cleaner than most outdoor air on a typical day — and far cleaner than the recirculated indoor air your AC provides.
Inair's ERV units pre-condition incoming fresh air by recovering thermal energy from outgoing stale air. Your AC isn't cooling outdoor air from scratch. The ERV unit itself draws 25–60 watts. Our Mumbai case study shows a 1.2–1.9 year payback period when factoring in AC savings and energy savings together.
Far less than you're imagining. A standard apartment installation requires a single wall penetration (~50mm diameter) per unit and takes one day. No tiles broken, no walls opened, no major civil work. We do a detailed site survey before any recommendation so you know exactly what's involved before committing.
No. Residential units run at or below 45 dB(A) at the unit, which is quieter than a ceiling fan on low and well under a wall-mounted air conditioner. The fan is sized to move its rated airflow at low speed rather than to force it at high speed, and the ducting is lined. Most owners report that the only way they know it is running is the air itself.
Yes, and high floors are often the easier case. The unit needs a core-cut through an external wall for the intake and exhaust, which is straightforward at any height, and outdoor air is usually cleaner above street level because it sits further from vehicle exhaust. What matters more than the floor is whether ducting can be concealed or has to run in a boxed soffit.
No air conditioner does. Split units, VRF and central systems all cool and recirculate the air already inside your sealed home — none of them has a connection to outdoor air. That is deliberate, because conditioning outdoor air costs energy. It also means the air in a closed, air-conditioned room is the same air, hour after hour. Ventilation is a separate job, and an ERV does it with heat recovery so the energy cost stays small.
The opposite, in practice. The heat exchanger transfers 80–90% of the thermal energy from the cool air leaving your home into the hot air coming in. At 44°C outside, incoming air reaches the room at roughly 26°C before your AC sees it, so the AC closes a 2°C gap rather than a 20°C one. Most homes see AC consumption fall rather than rise.
Fresh air enters through a cowl on an external wall and travels through flat ducts — 132×30 mm — inside the false ceiling void to the central unit, where it is filtered and heat-recovered. Conditioned air is then delivered room by room through ceiling diffusers, and stale air returns through a separate duct run and is exhausted outside. Your engineer produces a room-by-room layout from your floor plan before anything is installed.
A Revita 150 draws about 65 W, a 250 about 90 W, the 350 used in most 3 BHK homes 125 W at maximum, and the 500 about 150 W. Running continuously, the 3 BHK unit adds roughly ₹150–200 a month — about two light bulbs. Because heat recovery reduces the AC's workload, many homes end up net neutral or better.
A standard 3–4 BHK apartment takes 10–12 days; a large villa above 5,000 sq ft takes 15–25 days. No walls are broken. The flat ducts run entirely inside the false ceiling void, and the only visible parts are slim ceiling diffusers of the kind used in premium hotels. One penetration of about 50 mm through an external wall handles intake and exhaust. No chasing, no tile damage.
A supply fan does half the job. It pushes filtered outdoor air in with no return path, so the room goes slightly positive and the displaced stale air must escape through a door, window or gap — and in a sealed Indian home there often is none. It also supplies that air untempered, adding load to the air conditioner. An ERV is balanced: matched supply and extract, with heat and moisture recovered from the air leaving.
Free · No obligation · Pan-India

Your home is where you
should breathe best.
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