One can take engineering courses at many colleges and universities, for example DeVry University. These types of course are also available at Stanford, Brown, the Massachusetts School of Technology and the University of Arizona.
For a career in chemical engineering one should consider courses in chemistry and biology. After that courses to take include business and management and biotechnology.
To take sound engineering courses, you should register at your local technical training institute or sign up for online courses that you can take at your convenience.
There are some courses online for engineering which can be transferred to an university. There is no real engineering distance learning so you have to take some of the courses online and transfer.
Aeronautical Engineering
I'm assuming you are still in high school. If, so, you might want to start with "Intro to Engineering." Then you want to explore your possibilities with courses like ECE, Civil, EEE, Mechanical. Never choose a career by it's value; always choose a career of your interest.
An engineering career requires you to understand how motion, even minute, affects matter. This would require a good knowledge of higher calculus. Take as many courses in mathematics that you can and make sure you have an excellent grasp of differential calculus. Eventually understand Newton and Liebnitz and their theories.
The importance of quantitative analysis makes it highly desirable for those planning a career in economics to take courses in mathematics, statistics, sampling theory and survey design, and computer science (Harkavy, 1999)
There are a lot of good courses to take depending on your interest. You can take computer science courses, teaching, and medical ones.
There are many online courses for engineering. However, many people take classes at an actual engineering trade school to get hands-on teachings and tests.
Most colleges teach the courses that are required for this field of study. I was unable to find the top school for this particular career but this website will tell you about all of the courses that you will need to take, http://www.ucsd.edu/catalog/courses/SE.html, it is from the University of San Diego.
There are courses you can take in college for this career, but there are also individual organizations and outside classes that are made specifically for this career path. These organizations consist or programs and training.
If you want to repair heating and air conditioning systems, you should take technical courses. These courses include mechanical engineering and electrical engineering.