7 important guidelines for split AC installation

Window AC uninstall

The installation of the split air conditioners is a crucial job. If the installation is done accurately your air conditioner will give optimum cooling, but if it is not done properly you won’t get the desired cooling effect. A poor installations also leads to frequent maintenance problems.

Several factors have to considered during the installation of split air conditioner.

Strength of wall to hold the AC

The indoor unit of split AC must be installed on a wall strong enough to hold the unit’s weight.

Proper spacing between wall and AC unit

The indoor unit of split AC requires at least 15 cm of open space surrounding its top and sides for proper air flow.

Appropriate installation height from ground

Mount the indoor unit of split AC at a height of 7-8 feet above the ground for adequate cooling inside the room

Correct tilt angle of indoor unit

While fixing the aluminum bracket on wall make sure that the bracket is given a slight tilt angle, so that the indoor unit of split AC, when fitted is also at a slight angle to enable unrestricted flow of the condensed water from the drain pipe.

Correct location of outdoor unit

For proper cooling, mount the indoor and outdoor units of split AC at location away from direct sunlight and water. Install the outdoor unit of split AC in open space so that there is no hindrance to the heat dissipated from the condenser.

Proper placement of outdoor unit

The outdoor unit of split AC must be placed on a flat and rigid surface. This unit contains key components of split AC like compressor, condenser, fan motor etc. If the unit is not on a flat surface then it will vibrate excessively, which can lead to the breakage of copper pipes, coolant leakage and compressor/condenser damage. Further, the vibrating unit makes lots of noise which could disturb you and your neighbors.

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Right distance between indoor and outdoor unit 

Correct distance between the indoor and outdoor unit plays a very important role in cooling. The coolant at very low temperature flows inside the copper tubes between indoor and outdoor units of split AC. There is always some loss of cooling effect to the atmosphere when the refrigerant flows between the units. Hence to reduce this loss, keep the distance between the indoor unit of split AC and the outdoor unit of split AC as minimum as possible. The maximum allowable distance between the indoor and the outdoor units of split AC can be about 15 meters.

Here are some of the tools/fittings that will assist you better when installing an AC.

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  1. 1

    I have heard from a person who installed Air Conditioner at my place…. he quoted that the copper pipes between indoor unit and outdoor unit must be of minimum 10ft. of length as it is made mandatory by the companies who produce ACs and compressor takes extra load with shorter lengths of copper pipes and becomes hot.
    But by logic and reasoning, I find this argument as baseless because lesser the travelling of the gas the greater would be the cooling as the loss would be minimum…. Anyone please suggest some sense and reason in support or against my query..!!!!!!!!!!

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    Thanks for your valuable information. I would like to know whether there is any issue of leveling ( relative heights) of indoor and outdoor units.

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    The Article on 7 important guidelines for split AC installation os really amazing . Thanks for Sharing the information . Can u explain more about the features

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    this may seem a silly question but would highly appreciate advice on the matter;
    I am planning on installing split ACs into my bedroom but am planning on some renovations including painting and such. Is it advisable to install the AC and then finish the painting of the walls or the other way around since there will be drilling done to the wall etc.
    Input would be much appreciated

  11. 11

    These are very important steps. I specially recommend people who are buying first time should read this and follow the steps. I will help in smooth installation of AC.
    Avoiding small points sometimes may cause problem later and you will end up paying money for repair. So follow these steps.

    • 12

      I want your help in installation of split AC in my room above my cabinet. The space available on the cabinet for indoor unit is L-92″, H-26″, D-22″ .
      Connection to outdoor unit has to pass through 30″ (approx.) width of the beam.
      Can you guide me?

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    Service cantre वाले खुद 400₹ , में कचरा काम करवाते हैं , साख कंपनी की गिरती है ,

  16. 17

    I am from Paradip, Odisha, a coastal town. Need to install a split AC – 2 Ton capacity. Cost of running (electricity) is unimportant. Need advie on selecting an AC which will provide good service, will not be affected by corrosion (especially the condenser part). The price range should be less than 60-65 K (in online)

    Please advise about the brand & model.

    With regards

  17. 18

    We bought split ac but theven distance between indoor and outdoor is parallel and it is only at the other side of the wall.maybe less than 1 meter. Is there any problem in this?

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    I installed split AC in second floor .

    I installed outdoor unit in first floor 7 meters below the the AC.

    Is it affect the efficiency of AC like cooling affect etc..?


  19. 20

    Outdoor unit is installed in direct sunlight, what harm will be done to outdoor unit?
    Also, the installation team put no screws to support the outdoor unit, it is jus placed on a small roof outside room window, are there chances unit may fall down, it’s on second floor?

  20. 21

    I cannot take the outdoor unit connection by making the opening right behind the indoor, can the pipes come out from below the a/c and then exit through a wall on the right?

  21. 22

    the outdoor unit of the split unit is actually kept out side a room with lattices on the roof of the building open to sunlight but one of our managers recommended to install it inside the the room with lattices as he says it will get enough air for the outdoor unit to work .The room gets filled with dust on a regular basis. what do you recommend?

  22. 23


    I am planning to get an AC installed in my bedroom and was wondering which is the best position for the indoor unit. It should either be the wall behind my bed (AC unit above my head) or the one opposite to it (AC unit facing the bed) which are about 15 Feet apart.

    Any thoughts on which would be the ideal choice?


  23. 24

    i have recived ac from flipkart which i orderd 1 ton but they have send otdoor unit 1 ton and indoor unit 1.5 ton if i will fix in this combination is theare any problem

  24. 25

    I have bought a new OGEN 1 ton AC which is to be fixed tomorrow. Kindly advise if there is a bend in the pipes connecting the indoor unit to the outdoor unit will there be any loss of cooling or any other problem? Request you to reply immediately as the time is short

    • 26

      Hi Kannan, Please get the bend checked for leakage first. If there’s no leakages, there should not be any problems unless it’s a big bend that would restrict coolant circulation.

      Kanishk Karhana
      Mr Right Team

  25. 27

    Is it better to install the split Unit AC on a flat roof or on the side of the building? The contractor is telling me it is better to do it on the roof, but it sounds like you are recommending that it is installed on the side of the building.

    • 28

      Hi Greg,

      There’s no better out of the two locations. Just keep in mind the following factors to decide the right location for you.
      1. The outdoor unit should be in a place with minimum exposure to dust and direct sunlight
      2. The unit should be horizontally installed. Any angels will be induce vibrations.
      3. The longer the distance between indoor and outdoor unit, more will be the losses in cooling.

      Kanishk Karhana
      Mr Right Team

      • 29

        Hi there, with regards to #3, would a higher BTU indoor unit be able to compensate for the increased distance between the outdoor unit and indoor unit?


        • 30

          Hi Alex, yes that can do the trick. But only do this if the distance is greater than 2 times manufacturer’s mentioned distance between the units (in most cases manufacturers mention an ideal distance of 3 meters). Otherwise you may over-compensate by going for a higher BTU. Over compensating will lead to the AC cooling the room very quickly and then getting cut-off, and then again cooling the room quickly. Thus, the cut-off cycles will become too frequent. This will reduce the life of your compressor.
          Another good idea is to add another layer of insulation on the copper pipe which connects both the AC units.

          Kanishk Karhana
          Mr Right Team

  26. 31

    Hi I have installed 5/8 pipe few months back . Now I have bought 1 ton split. It comes with 3/8 pipe. I can’t change the plpe as it is concealed. I hope it will not effect the cooling of the split. Please help

    • 32

      Hi Ravinder,
      We are sorry to inform you that using a 5/8 copper pipe will affect AC’s cooling. This is because the compressor is designed to circulate coolant at a particular pressure (depends on the AC’s tonnage), thus using a wider pipe will reduce the pressure which intern reduces cooling capacity. We suggest you to use the pipes supplied with the AC. No need to take out the 5/8 pipe from the wall. Just get the 3/8 pipe installed parallely.

      Mr Right Team

  27. 33

    can i place CU over the door if no alternative location exist? would it jeopardize ashrae 15 requirement? , if so does a drip pan will solve that issue.

  28. 35

    My indoor unit of 1.5 ton 183v Voltas AC felt from 3 Ft height on cemented floor at the time of installation. What may happen into it?

    • 36

      Hi Ajay, sorry to hear that!
      Get the blower fan checked for proper functioning and cooling of the AC checked for any leakages. Damage to any other part won’t affect it’s performance.

      Mr Right Team

  29. 37

    We have installed a split ac where tge distance berween the 2 units…indoor and outdoor is as back to back on each side of the wall.however the pipe through which the gas passes for cooling is a 3 metre pipe coiled up and pinned to the wall.
    Wont that result in loss of cooling.we dont need such a long pipe when the distance of travel of the gas is less than a metre.
    Please advise…should the pipe be cut short?

    • 38

      we also have the same question.
      can somebody answer this as soon as possible?
      an authority on this is highly welcome.

      • 39

        Hi S.Basu and Sonali,
        Sorry for the delayed respose. There is no practical loss in cooling capacity of the AC for a under 3meter connection. No need to cut the pipes.

        Mr Right Team

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      Hi Madhuri,
      Cement sheets don’t have the rigidity to support a split AC. Thus, not recommended.

      Mr Right Team

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    what will happen if other shop owner install out door unit of split a/c in passage ( which 3 feet ), after ther my shop in shoping complex

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    thanks for useable information, plz guide if distance between indoor to out door unit is approximately 90 ft, in this senerio is the split unit work properly

  38. 50

    The information that talked about the indoor unit of a split AC and how it should be mounted at a height of 7-8 feet above the ground is what got my attention. I say that because my father went to the store to get a split AC unit to replace his old one. The last one he had was below the height of 7-8 feet.

  39. 51

    Thanks for a useful article. How do you want the indoor unit to be tilted – on one side or backward? A line diagram would be useful. My split AC was tilted to one side and that led to water seepage inside. I got it leveled with a spirit level and refixed – no seepage now! Cost me 3000 as gas had to be refilled. Aren’t split units designed to have a natural flow of water outside through the tube when installed level? I have not seen any split unit mounted with a tilt till date (except my own that was done incorrectly by Whirlpool – company with poor service record). I have seen window ACs mounted with outer edge tilted down to drain water but never a split AC. In fact Internet has guidelines that advise using spirit level to ensure level mounting of split AC unit !!!

  40. 52

    How much minimum free space should be maintained in front of the fan grill of the outdoor unit of a 1TR split AC ?

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    The building next to building has installed the outdoor unit in front of my kitchen. There is open utility between the a unit and my kitchen. Will the heat generated from the AC harm the air entering my kitchen?

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