I need to replace my air conditioner, but my furnace works fine. Is it true they need to be replace at the same time?

Think of your air conditioner and furnace a part of a total system.  That system will work better, long and more efficient if all it’s components are matched in capacity and efficiency.  By the same token, a mismatched system – one that mixes old technology with new – could decrease system performance and overall comfort.

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