If your heat pump needs replacement, install one significantly smaller than what your HVAC installer recommends. It will be more efficient and last longer if it runs continuously during the hottest days and doesn't keep the house at a constant temperature.
Also, don't install the air handler, or any duct work, in the attic.
HVAC installers always oversize the equipment to avoid callbacks from customers who insist the house stay at 68F in the middle of August. Don't be that customer.
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