You either have a bad a/c heater controller or a bad or weak a/c heater blend door..........
Did you drink water before running? Cuz that'll happen if you do.
A reverse cycle air conditioner work like normal air conditioners only in reverse, transferring heat into a house instead of outside of one. It is not an air conditioner at all, but a heater.
It sounds like the heater core is leaking. Check for the smell of antifreeze and that will confirm the bad heater core.
This has much to do with how the air conditioner and the heater is vented. If the air conditioner draws its air from outside it could be picking up air / smell of smoke from the other family and then redistributing it into your home. A heater on the other had usually has a heater input vent within the house it is heating (it draws the interior air in and then heats it blowing it back out) as the air within the home will be significantly warmer than the exterior air.
It means that it does not have an air conditioner or furnace installed. HVAC stands for "heating, ventilating, and cooling". HVAC is an integrated system that is not free standing, like a window air conditioner or heater.
Well the heater could be because you have low engine coolant or the thermostat is stuck open so the coolant will not get heated up. As for the AC sounds like you are all out of free-on.
i believe your heater core has died
There shouldn't be any danger of running without the air conditioner freon in it. Except for when it is really hot outside and you are sweating like crazy. (Just kidding)
like running through a cornfield, backwards......naked.
it feels like a trickle of water running down your back
sounds like the blower motor resistor is out on the lower speeds.
sounds like you ac compressor is about to crap out.