Before buying or repairing  an HVAC unit,
 it is important to know what it consists of. HVAC offers  three 
functionalities (heating, ventilation and air conditioning) that are  
combined together to form a single system. The system has been developed
 to  adjust to the modern construction requirements for business 
establishments and  homes. HVAC units have evolved with time and have 
been able to adapt to the  changing needs. The most general problem that
 was linked to traditional systems  was the cost. However, more and more
 homes and establishments are enjoying  these units today because they 
are cost-effective and energy efficient.
Here is a  comprehensive list of products under the HVAC system:
HVAC blowers and fans
HVAC blowers and fans are those fragments that  are used for air 
movement. They make an important part of the air handling  system as 
they help in bringing fresh air into the rooms. They can be mounted  
above a ceiling or on top of an outer wall. In some circumstances, they 
may  also be utilized as part of a duct fun. Products that can ascribe 
to this  category include plenum fans, ventilation fans, duct blowers, 
roof fans, inline  fans, vane axial fans and centrifugal blowers.
Chillers and controllers
HVAC controllers and chillers are also a popular  part of HVAC units. 
HVAC chillers are essentially refrigeration systems that  are employed 
in industrial and commercial establishments. These systems work  with 
the help of refrigerants, water, oils and other such fluids. HVAC  
controllers, on the other hand, are those parts that are used for 
monitoring  environmental factors indoors. They can monitor heat and 
temperature which  leads to regulation of coldness and warmth of air 
flowing within an  establishment.
Other important HVAC parts:
- Circuit boards - comprising of timer panels and control panels.
 - Compressors - used for pressurizing and compressing air that can be released in quick bursts.
 - Thermostats - responsible for keeping the temperature constant.
 - Accumulators - a common part of the HVAC system. They are the suction lines on an air conditioner.
 
HVAC units use a variety of technologies to  perform their 
functions. While some cool and heat using electricity to change  air 
temperature; others are hydronic systems that heat water and circulate 
it  through in-floor pipes and radiators in order to offer warmth to the
 rooms.  When looking to buy a HVAC unit, it is important to consult a 
professional to  get a basic understanding of the functionality and 
efficiency each brand offers. 
