Plan and prepare your DIY install

Planning and preparing your own DIY air source heat pump or air conditioner install.
Plan and prepare

These pages are designed to help you decide if a DIY mini-split air conditioner / heat pump install is suitable for you.

It is best to check everything in this ‘Plan and prepare’ section before starting.

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DIY capability

The DIY skills and equipment required to do a heat pump or air conditioner install.

Sizing considerations

Factors affecting the size of the system

Size calculator

Checkmark’s air conditioner system size calculator.


Factors to consider when choosing a position for your indoor and outdoor unit

Planning permission

Do you need planning permission or can an install be done under permitted development?

Electricity supply

What to consider when planning the system’s electricity supply