DISABLED AND A HEAT PUMP

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You need to have some calculations done on cooling capacity you require in your home. Architecture can have a major impact on your cooling needs and that needs to be taken into account. The group alt.hvac or alt.hvac.design might be more appropriate as they do those types of calculations all the time.

Once you know the load to be expected, you can take into account the capability of the various technologies to achieve this cooling capacity. Again, the architecture of the house can have a dramatic impact on the cooling effort required.

Some rough values might be done by yourself at sites like this:

Of course, you're aware that moving would make it all easier. If you find that this is truly a life issue, you're also going to need to account for the fact that power fails. So what will you do if power fails and it's the hottest part of the day? If not a big diesel generator, I'd consider building a room in the home that can be cooled separately from the entire house in some easier manner, and perhaps at a reduced differential.

As far as I can tell, you are asking if air conditioning can drop the ambient in a house by 28 degrees F. A rule of thumb says a 20 degree drop is the normal expectation. Higher drops are more expensive. The temperature RISE available from heat pumps is more problematical I agree.

Brian Whatcott Altus OK