Now is the time to figure out how much heating and cooling you really actually need. Who knows who or how the unit you have was matched to your house? Have you done, or had done, an energy audit or heat load analysis? How well is the home sealed and insulated? Have any improvements been made since the 4 ton unit was installed? Answering these questions will. get you in a sweet spot as far as overall btus required.
You may expose issues with your home's envelope that could be dealt with to drastically reduce your heating and cooling needs. Materials like caulking, foam and rubber seals are ultra super cheap compared to the leaks they stop. Added reflective or refractive insulation is an investment that starts paying you back the day it is installed. These materials incur no running costs, next to no periodic maintenance, and have very long lifespans..It is always wiser to reduce your demand than improve your supply.
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