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:
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Texas A&M University found a 23% refrigerant undercharge could result in a 52% efficiency loss. |
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Pacific Gas & Electric found the average heating energy savings for:
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Lakeland Electric & Water researchers found that by repairing leaking duct work, cooling energy was reduced by an average of 17.4%. |
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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. |
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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. |
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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 |