During the good ol' summer time, you may be looking for a new
central air conditioning unit to keep you cool.
Most homes have
a central air conditioning unit with a 10 SEER (Seasonal Energy
Efficiency Rating). By choosing a new Energy Star qualified unit
with a SEER of 14, you can reduce CO2 emissions by about 1,540
pounds annually, assuming it's on for 1,320 cooling hours, or
8 hours a day for 5-6 months. And make sure that your contractor
does the sizing calculations so you don't install a unit that's
too big. It will cost more and require larger ducts to handle
its higher airflow. The unit also may fail to provide the expected
comfort.
Source: Consumers Union's GreenerChoices.org