JimR wrote:

"Tony Hwang" wrote:

I am trying to have an air conditioner for the whole house installed...

... your decision may depend upon other factors, e.g., warranty, distance
of the dealer from your location (for future service calls), cost of
a service call or yearly inspection, etc...

Or forget service calls and buy 8 $80 5K Btu/h 10 SEER window ACs with
motion detectors with 1/2 hour delays, for an effective 20-SEER system.
If one breaks (and the others keep working), return it in warranty or
throw it away and buy another :-)

Nick