Gas training courses are open to nearly anyone. A usual student may be somebody that is already working with a friend in the gas or plumbing type of industry. Or may perhaps be someone looking for a change in career and do not have any previous experience. No matter who you are, everyone should be capable of finishing at least one of our gas courses which will help you to obtain a gas certification. Refrigerant Oil Enhancement has proven to be highly effective, affordable and able to increase efficiency in air conditioning HVAC, chiller and walk in refrigeration units. This efficiency technology requires no new HVAC equipment and in a commercial setting will show a payback ROI within a year. This conservation product is a specifically blended refrigerant oil supplement that has multiple beneficial attributes when added to the refrigerant line of existing HVAC compressors along with the existing refrigerant oil.