Enhanced Capital Allowance Scheme
There are certain technologies of which some, or all of the initial investment costs can be recuperated from the UK government. This is called Enhanced Capital Allowance or ECA.
Guess what?
The Air Conditioning system you thought was out of your budget range may qualify!
The questions you need to ask:
What can I claim? This link directs to the same page as the link above. You'll need to scroll down a little for information on what can be claimed.
Does my proposed investment qualify? For "Air Conditioning" select the "Heat Pump" technology, and "Air Source: Split & Multi-split" as a sub technology.
You will need to know the manufacturer and proposed system before entering the above link. For example: FUJITSU AWY17L
Most of AACR's "heat pump" (heating and cooling) systems qualify for ECA.