An item that costs $8900 cannot be deducted under the de minimis rule. The cost must be under $2500 to qualify for that special tax treatment. Also, section 179 treatment is not available for rental properties.
Installation fees, permit costs, and labor for installation are included in the total cost of the HVAC, not just the cost of the HVAC unit itself. You would not deduct those expenses as a separate item on their own.
Depreciation of a new HVAC unit is over 27.5 years, not 5 years. If it is a central unit that becomes a component of the house itself, then it is depreciated over the same time period as the house. You would choose 'Residential Rental Real Estate' as the asset category when entering the information for depreciation.
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