Any Hvac or Truck companies that train you and give you certifications if you work for them in houston?

I currently work for beer distribution as a drivers helpers, and yes they do give you a cdl after like 5 months of being a helper but its legit hard labor work, especially on your back in legs. For someone with scoliosis like myself, this has become very difficult. Btw i already know how to drive 18 wheelers, i was a fueler before moving over. Ive always like Hvac so if there is a company out there that would train me while i work for them that would be great.