Hi,
Although I only studied HVAC in college for a short period I have recently completed some HVAC drawing for a client in Australia. I installed the A/C units, heaters and Ducting work. The overall layout drawing was supplied by the architect.
You can view these drawing on my portfolio tab on my profile page. If you are interested we can have a chat about the work to be completed and maybe revise the cost for the drawings to give you a better price, we can always negotiate.
Cheers,
Graham.