Hello thank you for your project in freelancer.
I see it is a very great project, in the field of HVAC I am searching my first project and show how I am able to get and develop this type of project, please let me know more about what you need, if you need bill of materials, a 3D drawing to check some interferences and what more I can do for you.
In my projects with customers I do not use to charge for reviews and I like to go when you feel ok iwth project. Please check my comments and if you feel interested please do not hesitate to contact me.
Thanks,
Marcello