​Without the right installation you could be wasting 50¢ of every energy dollar and still be uncomfortable.
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North Carolina Alternative Energy Corporation
This non-profit organization examined HVAC manufacturer's efficiency versus the actual efficiencies that resulted after installation. This is what they concluded:

• 90% of the units tested had some sort of energy wasting problem
• 50% had an improper refrigerant charge
• 40% failed to meet minimum airflow criterion
• 20% were barely inside the airflow range specified by manufacturer's
• A deficiency of 20% in airflow can reduce the efficiency rating by 17%
• A 15% return air leak in a 120-degree attic could reduce an air conditioner's SEER rating from a 12 SEER to a 6 SEER

Texas A&M University
found a 23% refrigerant undercharge could result in a 52% efficiency loss.

Pacific Gas & Electric
found the average heating energy savings for:

• Repair of disconnected ducts was 15%
• Repair of diffuser leaks was 7.5%
• Correcting low airflow 5.6%
• Repairing leaks and correcting refrigerant charge 18.4%
• Lakeland Electric & Water
• researchers found that by repairing leaking duct work, cooling energy was reduced by an average of 17.4%.

Honeywell
found that heat pumps lost almost 50% of their efficiency after 20 years, even if a typical "dust stop" filter was installed. In 20 years, a 12 SEER unit could degrade to a 6 SEER. This would double the energy cost.

Louisiana State University
and Gulf State Utility found consumers could save about $30 per month just by making sure that their air conditioning or heating system was cleaned and serviced regularly.

HVAC Manufacturer's
data shows a condensing unit with a SEER of 13 matched with an old air handler would decrease the SEER to 9.2, resulting in 30% less efficiency

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