Burning plastic or rubber smells indicate there is a piece within the unit that is melting.
Electrical smell from air conditioner.
When you turn on the air conditioner you may smell stale cigarette smoke.
Have a professional locate and repair the leak before recharging your system with refrigerant.
There are plastic components surrounding the wiring with your system and is the wiring starts you burn you will notice a foul odor.
Electrical components are burning if you notice a burning plastic smell that also smells like sulfur or rotten eggs there could be a dangerous electrical failure lurking within your air conditioning system.
We have a name for a stale musty and sometimes cheesy smell coming from an air conditioner or other hvac appliance.
Give it 20 to 30 minutes and see if the smell dissipates.
Instead the cause is likely mold or mildew.
But it has nothing to do with sweat or working out.
If your air conditioner smells moldy the general cause is accumulation of water in the drain pan or drip lines or ducts in case of ducted systems which can cause fungus or mildew to grow.
If you are just turning on your heater this could be a problem which will eventually go away on its own.
If you experience a smell similar to burning plastic rubber or a burning electrical smell this is not normal and will require professional help.
Also known as bacterial growth mold and mildew will circulate through your indoor air once it has settled in your air conditioner.
Cigarette smoke if someone has smoked in the home the odors could accumulate in the filter and evaporator coil.
Change the filter schedule a professional tune up and cleaning and only smoke outdoors.
In the fall the first few times the heater kicks on it may emit a burning odor that can smell electrical and dusty.
Electrical odors could indicate a mechanical problem with your ac fan or compressor wiring issues or electrical component failure.
For example there may be bad wiring in your air conditioner wiring or your motor may be burning out.
Mold and mildew growth is the most common cause of bad smells in your ac system.
If it does it probably was just the dust burning off.
Electrical odors can have a variety of causes.
A stale and dingy smell is by far the most common and foul smell that is experienced from acs.
Electronic air cleaners can produce ozone which has a slightly sweet scent.
This smell needs to be examined by a professional immediately as there is a risk for fire with any electrical problem.
When your heater is burning off dust and dirt it will smell musty.