Heating and air conditioning contractors

In countries globally, HVAC contractors and Air Duct Cleaning companies are members of the National Air Duct Cleaners Association. This association was founded in 1989; it is non-profit and is established to set standards and methods to clean HVACs. The conglomeration has since expanded its mandate to assessing, cleaning and restoration of HVAC systems. The mission of the association is to be the only source of cleaning HVAC services. The membership to the association has greatly increased in the USA and Canada as well as other states and they now have a certification of Air Systems Cleaning Specialists (ASCS) and the Certified Ventilation Inspectors (CVI). The association has also created awareness by publishing articles and other materials to the public and its members showing the expected standards and its standards include Assessment, Cleaning and Restoration (ACR),Certified Ventilation Inspector (CVI) as well as other guidelines have been set for the best HVAC operations.

So basically all HVAC professionals should receive training and get certified by the association. In the US the training is offered in some universities and the curriculum involves both hands on tasks and theory studies. The students then earn associate degrees at the end of their studies. Later on they can become apprentices and the certification extends to air conditioning, heat pumps and even commercial refrigeration.

There are many types of air conditioners, the car air conditioner, the wall air conditioner, the central air conditioner, the portable system and the split system air conditioner. Most air conditioners have the following similar parts, the compressor, the condenser, the evaporator, the expansion valve and the drier or accumulator. These parts are interconnected using pipes and valves. Refrigerant is the fluid which is also highly volatile that transports heat from one component to another. The air conditioner basically starts working when you turn on the AC and the refrigerant goes to the compressor where it is compressed and absorbs heat and changes from liquid to gas. Then it goes to the condenser where it is cooled sometimes in some systems the condenser may be fitted with an electric fan. After being cooled and changing back to liquid the refrigerant moves to the evaporator where it is cooled further and then air is blown across it for it to become cool and this cool air is then blown into your environment. The refrigerant then absorbs the heat from the air blown and it reverts to a gas. The drier removes any impurities on the refrigerant using filters and desiccant to absorb any moisture. The expansion valve controls how cool the air you receive will be. Before acquiring a unit you should check how energy efficient it is and for some of the appliances industries they offer free installation of your unit.

Always get a unit that is the perfect size, a small air conditioning unit will not effectively cool the house and a unit that is too large will run your bills too high as it turns on and off unnecessarily. It is always recommended to get a contractor to get you the best deal and for him to check your house for the most suitable type of unit.