I am looking to change my job, at the moment all the job ads require electricians to have knowledge of Hvac ahu fcu and Bms. Can anybody give me advice as to what course I should take to gain this qualification. I am a 17th edition electrician with C and G 1 and 2. There seems to be no end of courses and I am at a loss to know which one to go for so that I don't waste any money.