|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:
|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:
|Lakeland Electric & Water
researchers found that by repairing leaking duct work, cooling energy was reduced by an average of 17.4%.
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.
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