I feel that installing solar would give you a better return than what upgrading your aircon would.
Here is some info I posted in another topic regarding our experiences.
Sunboost are advertising 6.6kw systems for under $4,000 so you might recoup the cost of a system in just a couple of years.
However, upgrading the aircon might cost you half the price of a solar system but only save you a few hundred dollars annually.
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