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bigbearbear

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I understand the advantages of properly sizing an AC, but I want to check if newer technology such as the Carrier Infinity 20 AC with Greenspeed Intelligence will let me install an oversized AC but still keep the house comfortable?

The reason for this is to handle the occasional days here in California Bay Area when the temperatures goes beyond 100 degrees. Granted it is very rare and summers are usually pretty mild in comparison to weather in other places, but since I work from home, I want to be very comfy even when there's a spike in outdoor temperatures. :grin2:

My current AC is a old Carrier, still works good after 20+ years but I'm toying with the idea of possibly replacing it with something that will handle the rare spikes in temperatures in my area and keep the house a cool 70 degrees even when it is 109 degrees outside.

Recommendations?
 
Chances are your duct system is undersized for what you have, let alone going bigger. So if you do go bigger, plan on enlarging supply ducts, return ducts, size/number of registers & grilles.
 
With a Greenspeed, you might as well replace all the duct and start from scratch. Greenspeed is one finicky system, it picks up on static pressure and any deficiencies in duct design.
 
With the Greenspeed over sizing the equipment is not the problem as the compressor is variable speed. However as in the other replies you will have to make sure your duct system is properly sized. I would first get a professional load calculation performed with a nomograph for area loads within the home. Then once the proper BTU requirements and air flow are determined then size the equipment and duct system you need. It is my experience with the Greenspeed system if properly sized and installed you will see a substantial energy savings over a 20+ year old system even if your load calculation calls for a larger capacity system. The Greenspeed conducts a duct pressure test every 24 hours and runs algorithms on performance so the duct sizing is critical.
 
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