Just built a home in central Florida. Worked with Florida Power "Build Smart" people and the home is Energy Star certified. Foam insulation in the concrete block. R-30 in the attic as well as the trussed roof patio. Double pain insulated windows,..Radiant barrier in the attic. The home is 1938 sqft under air. Problem: the air conditioner comes on for 6 to 8 minutes and is off for 10 to 15 minutes then comes back on. It's a 31/2 ton unit with a variable speed air handler, The same size the builder puts in the standard home. The unit has been checked mechanically by the installer,..I think its to big and cooling to fast,..not good for the equipment or the electric bill. Would appreciate comments and suggestions to fix. Its all still under warranty. Thanks, Harry

Sounds to me as though you may have already answered your own question. Do consider that your equipment is sized for much hotter and more humid weather. You may be able to get your local utility to perform a load calculation on the home or you may have to hire a disinterested third party to do one. This will settle the issue for you. Best wishes and good luck.

Using a rule-of-thumb method of sizing equipment (no substitute for calculations so could be dangerous) of 400 to 500 square feet per ton, a four- or five-ton unit would be indicated, Your unit works out to 553 square feet per ton, a little outside that range, but then your house may be better insulated than the average house. If it's too big, it shouldn't be THAT much too big.

It could also be a control issue, either controls not operating properly, or even thermostat placement.

Have them keep checking things.

Thanks for the response,...
The same home built with out the insulation package I have has the same 3 1/2 ton condenser unit. With my variable speed air handler it bumps it up to 14 seer. I have foam insulation injected into the concrete blocks and double pain insulated windows,..(low E on the west side). The home has cathederal ceilings the thermostat is located in a hall within that space with no supply vents blowing towards it. But it has me thinking the set points on the thermostat may be +0, and -0 degrees seperation. I'll bring that up, but I'm still pursuing the Idea the unit is to big. I may have to spend a few bucks for the indipendent survey, (power company doesnt want to get involved).
Thanks again Harry

You may also want to explore the use of an energy recover ventilator. With a home as tight as yours sounds, it may be a good idea. There is a lot of information on those here on this site as well as on different manufactirer's sites. Talk to whomever you choose to do your load calculations.
I also should tell you that insulation, while a super investment, does not have anywhere near the impact on building load that window type, shading and orientation to the sun does. Good Hunting.

Also please note that using square footage as a basis of calculating loads is fine for adding a romm a/c unit to a bedroom or something, but can never be used in calculating building loads.
Equipment these days also does not provide the tonnage that units did in years past. I always perform a load calculation on every structure before recommending heating or cooling equipment. This is a code requirement in many areas of the country and just a good practice.

If you find that the thermostat is set properly, you can try to set the speed on the air handler to a lower speed. it should help somewhat with this issue.