Plan and prepare your DIY install

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

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.

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

Factors affecting the size of the system

Checkmark’s air conditioner system size calculator.

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

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

What to consider when planning the system’s electricity supply