If your evaporator (indoor) coil / or filter is dirty,you'll have poor air flow, which means the unit has to run longer to cool the room down, so you pay a higher electric bill.
There is also a danger that liquid refrigerant will return to the compressor and break it, and then you will be buying a new compressor and getting the maintenance done.
If the evaporator coil isn't kept clean, micro-organisms grow on the coil and the drain pan.
They from a kind of disgusting slime and sludge that blocks air flow and plug up the drain.
A comment I've heard from home-owners who've seen the stuff washing out of their coils is:
We've been breathing this stuff?
Food for thought.
If your condenser coil is dirty, it can't reject heat, so not only is the compressor running longer to cool the room down so you're paying higher electric bills again,
It's also running with high head pressure, which will shorten its service life at the least, and break it eventually if the coil isn't cleaned.
The coils will be cleaned, the drain pan and drain line will be cleaned, and the indoor blower should be cleaned if it needs it.
The outdoor fan blades should be cleaned if they need to
The filter will be replaced.
The blower motors will be inspected and lubed,
And the drive belt (if there is one) will be inspected and adjusted or replaced as necessary.
The wiring will be checked to see if there are any loose connections or worn out insulation,
Supply voltage should be verified,
And the contactor should be checked for pitting and chattering.
When the cleaning, replacing, and adjusting is complete, the unit will be run to check operating characteristics.
If the technician performing your air conditioning maintenance makes any recommendations, pay attention.
If his work has shown a high degree of professionalism, take his recommendations seriously.
The frequency of your maintenance will depend on where you live.
Dry areas with little dusty and pollen in the air will need leaa frequent cleaning than humid areas with a lot of pollen and dust.
After your routine maintenance has been completed, keep an eye on your filters and condition of your coils, keep them clean, and it will help keep your air conditioner cooling and humming along for years
I hope this page has helped and please, feel free to contact us with any specific HVAC questions you might have, including questions about air conditioning repairs and installation.
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