Then the next really big concern is the heating and air units. Guessing the airconditioning units will have to be replaced, but can perhaps wait till spring for that. But keeping fingers crossed that at least the heating units might work ok for a while.
Are they rooftop units? If so, they are likely a combined heating/air unit where the functions are all combined in one box. Heat can work without air, and air without heat, but really need to have checked out to make sure no gas leaks/burners ok/filters changed, or if electric heat (ouch!) that the elements are ok. If heat pump, then heat/air are both compressor based, so air will work if heat does.
I mentioned changing filters - repeating here - filters always need to be changed. Every installation I have ever seen that was not brand new, and then some of those were the worst due to construction dust. Change before you start work, then after remodeling, change again.