Also the ac coil can loose freon and freeze the coil letting the fan run and burning out the fan from overheating and maybe a fire. 

The biggest culprit for air flow problems is dirty air filters and dirty indoor coils. 

Anyways to the question, appreciate anyone could help.As for stoves should I get a coil or glass top but with steam clean?

In a multi its not just installing the condenser, coil, and furnace. 

C. 

My goal is to purchase a Duplex in CO., IL., and or WI as early as March of 2023.

I have read smoke clings to the inside hvac coils so they may need to be cleaned to remove lingering odor...which is expensive, but I had a house and the 40 year owner smoked until her death and we didn't, we just put a gel odor absorber in the return air duct.

Some may include heating coils with fans in areas like foyers to help with recovery.Hydronic radiator/baseboard systems are generally heat only.  

This is basically a hot water coil with a fan behind it that is designed to fit in the recessed space below kitchen cabinets.

If it is, it’s not only inside, but all in the coils and around the compressor as well.