Like to lower your Air Conditioning Utility Bills?
Look at all the ways you can to reduce the heat and humidity load,
caulk, weather-strip, and insulate, to keep the heat and humidity outside.

Have a manual J heat load done and consider slightly under-sizing a
replacement condenser.

If you have an older furnace, there may not be enough airflow through
the evaporator coil.

Have all of the ductwork, diffusers, return-air grilles and filter areas
checked and properly sized, the ductwork must be properly sealed.

In cold climate, consider replacing the furnace with a new high
efficiency condenser furnace.

Then replace the central A/C system using a TEV refrigerant control on
the evaporator.

By slightly under-sizing the condenser and making certain you have an
optimal and balanced heatload on the cooling coil during normal run-time
conditions, --the unit will have a much greater BTU/hr heat transfer
output during average run-time conditions!

With a properly sized system and proper evaporator airflow you will have
consistent optimal nominal capacity heat absorption and removal, coupled
with longer run-time cycles. Just my experienced 'opinion' (only). -
udarrell

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Air Conditioning Efficiency

http://www.udarrell.com/air-conditio...fficiency.html