HVAC System Guides

What is an HVAC System?

A lot of people wonder what an HVAC system is, and struggle to find a good answer. To put it simply it is any system that is involved in heating, ventilation and air conditioning. Clearly this is a very broad term, and there are many different systems within each of the three categories.

When it comes to an HVAC replacement and installation of a new system, the old saying of “bigger is better” does not necessarily apply.  At the same time, a system that’s too small will not be capable of keeping your home comfortable.  You want the size of your HVAC system to be “just right.”  Your certified HVAC contractor will perform a load calculation taking into consideration the size of your home, its construction, how well it is weather sealed and other factors and recommend a system for your home.


Avoid the temptation to push for a larger system if you had to ask the question, what is an HVAC system. Most people have the mistaken belief that a larger system will do a better job of heating and cooling your home.  Also, don’t try to save money by going with an undersized unit.  A new heating and air conditioning system should be properly sized by an HVAC contractor for each home to maximize home comfort and efficiency.


A unit that’s too big will cycle on and off frequently, wasting energy and resulting in uneven heating and cooling.  In the air conditioning mode, this cycling on and off will also prevent the system from properly dehumidifying the air resulting in decreased comfort levels.


A system that’s too small will run constantly and will struggle to reach the desired temperature, especially in extreme conditions.  Just like a system that is too big, comfort suffers.

In either case, the result will be money wasted.  For the oversized unit, money was needlessly spent on a unit that was too big.  Both an undersized system and an oversized system will waste money on increased energy costs and repairs with a decreased level of comfort. By now we hope you know the answer to what is an HVAC system, and also learned some good tips on what system is best for your needs.