Cleaning the condenser coil.  This has always been the number one task that Service Technicians avoid at all costs when maintaining residential equipment.  Maybe it is the nature of the fast paced business when the weather gets hot?  Certainly could not be the lack of water to rinse the coil as there is almost always is a water spigot on either side of the home.  I cannot figure out why,  and this may be one of the largest aspects of seasonal maintenance that impacts the efficiency of the unit.  Sure, the system will still operate if not cleaned, for a while.  Lets explore just how the capacity and EER are impacted...

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Comment by Bob Blanchette on February 13, 2014 at 2:37pm

Yet another issue that's masked by oversizing. If the house has a 2 ton load with a 3 ton unit, there's a 1 ton "fudge factor" for things like dirty coils. Double row coils can be a nightmare to clean, they are an awful design IMHO. Make the condenser 25% bigger in each dimension and use a single row coil instead.

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