With a heat pump it is simply a wall mounted air handler with wiring plus refrigerant tubes fed to the outdoor unit.
I have been looking into getting a heat pump for my home, and for years I relied on a traditional furnace plus didn’t absolutely like it. The heating capabilities were sub par, and i also hated having such a immense indoor unit. It took up square footage plus wasn’t attractive at all. The upkeep for a furnace is significant too, and you always need to change air filters, call for service, plus be on it with bi-weekly cleaning. If you don’t, the furnace can light on fire or release carbon monoxide, and heat pumps are much safer, cleaner, plus environmentally friendly. How they work is by taking the existing heat energy in the air outside plus pulling it indoors. The reverse happens through coolant to be an a/c. That is right, I get a two for one system with this… A heat pump also does not require HVAC duct, with HVAC duct you are losing someplace from 20-30% of the treated air due to the ducts. There are also cracks, tears, holes or alignment complications. With a heat pump it is simply a wall mounted air handler with wiring plus refrigerant tubes fed to the outdoor unit. It then uses electricity to work plus promotes total fresh indoor air. Another benefit is that since you have unique indoor air handlers for every space, you can have customized heating plus cooling zones, then zone control is a currency saving tactic plus it is harshly comfortable for the whole household. The only con I would say to a heat pump is the high initial expense. However you need to consider the easy fact that you get what you pay for.