Yeah. Truck drivers do it all the time. As long as your in the open and not locked in the garage. The exhaust will kill you, otherwise.
no
You will use more gas when your air conditioner is running.
No. Running an air conditioner on fan does not cost as much as running on cool.
Yes, unless you want your air conditioner to actually work.
Depending on the the out side temperature even when the air conditioner sits idle, the refrigerant inside the air conditioner is changing from a liquid to a vapor .
Heatstrips could be on with ac
You will hear air circulating in the cold air return (or return air grille) when the heater or air conditioner is running.
No. The ECM is a computer.
there is a leak in the compressor...
If your air conditioner is running outside by not blowing cold air inside through your vent, your indoor coil is frozen. You will need to turn everything off and allow the unit to thaw out.
Running an air conditioner cools the air but also removes moisture from the air possibly making it feel dry and uncomfortable. It may then help to run a humidifier to add a little moisture to the air to make it more comfortable.
If dust is coming from your air conditioner, you did not put in a filter. You will ruin your air conditioner running it without a filter. Also, the vents will get dusty. You need to clean them.