If you have not already become aware, ASHRAE Society has a variety of ways that one can learn more on the topics of HVAC.
For those that can arrange to attend an out-of-town seminar, Society offers training in a variety of cities. Upcoming courses include HVAC Design Level I - Essentials and HVAC Design Level II - Applications. Locations are as close as Atlanta, and as remote as Hong Kong or Kuala Lumpur. Try to get that one on your next expense report!
If that expense report gets kicked back, consider one of the ASHRAE Learning Institute's 2015 Fall Online Course Series. About a half-dozen different topics are being offered this fall on a variety of topics.
Check out the following information sheet Click Here, or visit one of the following websites: