There are three distinct types of muscles: skeletal muscles, cardiac or heart muscles, and smooth (non-striated) muscles.
HVAC technicians are responsible for the installation, maintenance and repair of heating, ventilation and air conditioning (HVAC) systems. As an HVAC technician, your job duties may include inspecting existing systems and making recommendations intended to improve the efficiency and/or safety of that system's performance. HVAC-R techs may also work on refrigeration systems.
HVAC Technician Job Description. Heating and Air Conditioning (HVAC) technicians work on heating, ventilation, and cooling systems. HVAC technicians are also known as Heating, Air Conditioning, and Refrigeration (HVACR) technicians when they are also trained in working with refrigeration systems.