The AC in Your Flat
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A white outdoor unit on a bracket on a plaster wall, with pipes running above and a tin roof below, its maker's name blurred
Everything about this picture is a choice someone made: the bracket, the pipe runs, the roof below that catches the drips.

Stories / Outside the window / story 6 of 18

Finding a place for the outdoor unit

AC outdoor unit placement in a flat needs open air around the unit, a spot a technician can reach safely and your housing society's written approval, and it should never sit in a closed balcony.

From The AC in Your Flat. Updated 4 November 2026.

Choose the spot before you choose the unit. A place that looks tidy on the day of fitting can make every service for the next ten years hard or impossible.

Where can you put an AC outdoor unit in a flat?

Start with the place your society has set aside. Society guidance names AC ledges, utility balconies and service shafts, and says many societies don't allow open exterior walls and sunshades. Terraces are common areas, and it says these need an NOC from the society and affected neighbours.

A plain outdoor unit on the floor of a wide utility balcony, with clear space around it and towers beyond
AI-generated picture. A floor to stand on is the best thing a unit can have. It costs nothing later, every time the unit needs a service.

How much open space does it need?

Heat has to escape. A Voltas article says you can't put the unit in a closed room or a tightly sealed balcony, because the trapped heat makes the compressor work harder. A Bajaj Finserv guide gives figures of at least 1,000 mm clear in front and a balcony with at least 50 per cent open face. That guide is not a maker's manual, so treat the numbers as a starting point and go with your unit's installation sheet if it says otherwise.

An older Pune block with curved balconies and an outdoor unit fixed low on its side wall
Fixed to a side wall. Ask how anyone will safely reach it before the holes go in.
A curved Art Deco block in Pune with a small outdoor unit mounted beneath a balcony
Older buildings weren't drawn with ACs in mind, so most units are add-ons.

Whose hot air is it, and whose water?

Yours, until it reaches a neighbour. Voltas warns about hot air blowing into a neighbour's window or a cramped shaft. The drain pipe has to reach a designated drain, not a lower balcony. India has no single national law for split AC outdoor units, says the same society guide. Local rules and society bye-laws fill the gap, and they differ.

LG India's 50-second film on outdoor unit water. Its bucket tip suits a unit on a floor you can walk on, not one on a ledge. Channel: LG India.
A yellow old residential block in Mumbai with two outdoor units on the wall above a street market
Above a market or a footpath, a drip or a loose bracket lands on someone. Wet walls age fast too.

What to do

Yours to do

  • Ask the society secretary in writing where units may go, and keep the reply.
  • Ask the installer how a technician will reach the unit for service.
  • Check that hot air and drips won't land on a neighbour.

Leave to the trained person

  • Bracket choice, wall strength, pipe length and the fixing itself.
  • Any work outside the railing, which is for trained people with safety gear.

Also asked

Can the society refuse my location?

It can set rules. Guidance for societies says bye-laws may require prior written approval from the managing committee before drilling, and a unit fitted without it can draw a notice to relocate. Rules vary, so read yours.

Is a higher floor harder?

Usually. The higher and more exposed the spot, the fewer people are willing and equipped to reach it. See who should reach the unit.

Where this came from

This story rests on those pages, opened or checked by 4 November 2026, and on no tests of our own. Maker pages speak for their makers, and rules and wiring differ by building, so check your own manual.