Energy Efficiency of HVAC (heating, ventilation,
and air conditioning) has been steadily
improving over the years. Rating systems
have been developed to show the efficiency
of different types of equipment:
SEER
for air conditioners,
AFUE for furnaces, and
COP
for heat pumps. The efficiency of an older
system can be estimated based on the year
that it was manufactured or installed and
the region of the country. To estimate the
efficiency of a system, choose the region
where you live, and pick the year that the
system was installed.
