Some General Information about HVAC

HVAC  is an initialism/acronym that stands for "heating, ventilating,
and air conditioning". This is sometimes referred to as climate control.
In certain regions (e.g., UK) the term "Building Services" is also used,
but may also include plumbing and electrical systems. Refrigeration is
sometimes added to the field's abbreviation as HVAC&R.

The three HVAC functions, heating, ventilating, and air-conditioning,
are closely interrelated. All seek to provide thermal comfort,
acceptable indoor air quality, and reasonable installation, operation,
and maintenance costs. HVAC systems can provide ventilation, reduce
infiltration, and maintain pressure relationships between spaces. How
air is delivered to, and removed from spaces is known as room air
distribution.

In modern buildings the design, installation, and control systems of
these functions are integrated into a one or more HVAC systems. For
very small buildings, contractors normally "size" and select HVAC
systems and equipment. For larger buildings where required by law,
"building services" designers and engineers, such as mechanical,
architectural, or building services engineers analyze, design, and
specify the HVAC systems, and specialty mechanical contractors build
and commission them. In all buildings, building permits for, and
code-compliance inspections of the installations are the norm.
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