How to isolate vibrations from an outdoor air conditioning unit? Complete guide to isolating vibrations produced by an outdoor airco or heat pump unit.

Outdoor Unit Vibration Insulation on a Flat Roof

How to isolate vibrations from an outdoor air conditioning unit
Place a concrete slab or tile on the roof that offers enough space to put the outdoor unit of your air conditioning or heat pump on top of it. Then, cut a mat of Regufoam D300 (SKU M0718) in 8 equal pieces. Place under each corner of each Bigfoot, or unit's feet, one piece of Regufoam.

Now, the outdoor unit is elevated by about 80 mm, including the concrete tile, resting on the vibration insulating pieces of Regufoam. Be careful with tubes or hoses, they might be not long or flexible enough! Afterwards, listen under the roof/ceiling if the humming noise of the outdoor unit has sufficiently been insulated.

Place the remaining 4 pieces of Regufoam under the already placed pieces, if you still perceive some low sounding noise. We don’t recommend to add more vibration insulation than 50 mm, since this could lead to instability, causing play on the connections of tubes or hoses. Make sure that the unit still stands steady after applying more Regufoam.

How to reduce impact noise and vibrations from an outdoor unit


Once the vibration of the outdoor unit has been sufficiently insulated, you should provide the edges of the Regufoam with PU Finishing Tape in order to prevent water from penetrating the foam blocks. After that, the pieces of Regufoam can be attached to each other and to the Bigfoots or feet of the unit using a contact adhesive.

What do I need for insulating the vibrations of an outdoor unit?
In order to insulate your outdoor unit, you need concrete tiles or slab, to be provided by yourself and from our webshop you need the following:

Questions? Customer service
If you have any questions about the isolation of vibrations from your aircon or heat pump unit, pleas let us know. We are happy to help you!