Old Furnace Plus New Air Conditioning Equals Lower Efficiency

Most air conditioning systems work in tandem with a furnace, with the blower motor of the furnace doing dual duty in both the summer and the winter. However, it’s not uncommon for a homeowner may replace their air conditioning system with a new, more efficient model while leaving the old furnace in place. What they may not realize is that their new air conditioning system, even one with a high SEER rating, cannot provide optimal energy savings while attached to an older, inefficient furnace. 

Understanding The SEER Rating

When purchasing a new central air conditioning unit, one of the most important factors is the SEER rating. SEER stands for seasonal efficiency energy ratio. This rating is based on the cooling output and the energy input, with the higher the number representing larger energy savings. Newer models, especially those manufactured after 2006, have higher SEER ratings along with substantially increased efficiency. However, to realize this efficiency, it must be attached to an efficient blower motor. 

Anyone who is replacing their air conditioning system should also be ensuring that their furnace can meet the efficiency needs of their new unit. Most furnaces that are 15 years or older are less likely to be able to perform at peak efficiency. A new air conditioner connected to an older furnace will not necessarily be able to perform at the SEER rating advertised. 

In many cases, the furnace and air conditioning should be replaced at the same time to ensure the maximum amount of efficiency. Having one system which is older can detract from the energy efficiency of the other. Before replacing only the air conditioning system, make sure to have your HVAC professional inspect your furnace to ensure that it can meet the efficiency requirements of your new system.

Posted on behalf of James Smith, ClimateSmith LLC

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