I need a bit of help on charging customers/clients.

Im charging around £1100 for me to put in a 3.5kw system(thats also buying the unit)

The unit cost me around £300-400 the rest is mine and tax around 23%

Is that dear or cheap and could anyone give me a couple of examples on job you've done and prices.

Thank you
Danny (www.airconsquad.co.uk)