As mentioned previously, running your air conditioner without a filter can lead to severe problems. It could lead to decreased comfort and permanent damage to your HVAC system, which may result in hefty repair bills.
No, you should never run your AC without a filter!
Although there are specific situations when this may be acceptable for a very short time, in most situations running your AC without a filter could be disastrous.
It can freeze within the system, leading to blockages and impairing the flow of refrigerant. By meticulously removing this moisture, the filter drier ensures smooth and uninterrupted operation of your refrigeration system. The filter drier also plays a crucial role in preventing acid build-up.
Your AC system needs a filter drier to prevent refrigerant from freezing inside of it.
The short answer: You can get away with running your AC without a filter for a short period of time. However, doing so for longer than 6-8 hours can hurt your system and decrease your home's indoor air quality.
Is my AC not working because of the filter? Potentially, yes. While there are a whole host of issues that could cause problems with your air conditioning system, a dirty air filter should be the first thing to check if your central air conditioning unit isn't working as properly as it should.
Don't run your AC with a wet filter. It can cause your AC to work too hard, which will run up your utility bill and cause extra wear and tear on the system. You could also spread moisture and mold throughout your house. Turn off the AC, remove the wet filter, and check for cracks or clogs.
If the filter drier is partially clogged, there may be a few degree temp drop across it. However, if the filter drier is completely clogged, there will be a large temperature drop across it and likely frost due to the low temp of the refrigerant exiting the clogged filter drier.
Filter drier replacements: $400 to $600. Breaker or fuse replacements: $75 to $300. Line set replacements: $800 to $2,000.
All filter driers should be replaced every 2 years or by manufacturer's recommendation.
If installed backwards, the filter drier will become useless. Take care not to overheat the newly installed filter drier when using a torch for brazing a sweat-type drier to the liquid line. The brazed connections must be thoroughly cleaned and fluxed when called for.
If taking an air filter out to be washed, be sure to let it air dry for about 20 to 30 minutes before replacing. This will help you avoid any mold issues.
It's worth noting that if you don't replace the drier when you change a compressor you will invalidate your warranty protection.
If the suction line drier is left in long enough, it may become fully saturated if there's a lot of moisture present. Then the drier begins to disintegrate, resulting in abrasive materials running through a system. Big mess. Don't let it happen.
A filter drier is designed to protect a system from moisture, acids, and solid contaminants.
The desiccant is used to absorb moisture that may have gotten inside the A/C system during manufacture, assembly, or service. Moisture can get into the A/C components from humidity in the air. This is the “drier” function of the receiver drier.
HVAC Pro Cost
You'll want to ensure a crucial task like this is done correctly. To avoid potential injuries or problems with unit sizing or installation, ask an experienced local AC installation pro for a quote for your system. Most people pay $500 to $2,500 in labor for AC replacement.
Their life can be extended by using compressed air to blow some of the dirt off, but that can only be done so many times. OEM dry filters are generally effective up until 10,000 to 15,000 miles (check your service manual), then they must be replaced.
If your drier is clogged or contaminated, then your A/C likely won't be able to cool your cabin sufficiently. Debris inside the A/C system can clog the drier and cause the desiccant to mix with the refrigerant and lubricant.
Final answer: A technician can determine if a filter drier is clogged when the pressure drop exceeds 2 psig, indicating that it needs replacement. Other indicators include a change in the color of the indicating chemical disc.
Reduced Air Quality
The most immediate impact of not using a filter in your AC is a decline in air quality. Without a filter, contaminants like dust, dander, pollen, and other particles that would normally be trapped are now free to circulate in your home.
First, check your filters and coils for dirt and debris that may be impeding airflow. Once you've cleaned the filters and coils, run the air conditioner with just the fan so that the ice accumulation can melt off. If the AC still doesn't blow cold air, it could be that refrigerant levels are too low.
You can leave them out in the sun if it's not too hot, or you can run a hairdryer over them, or you can set them out to air dry - but whatever you do, don't put a damp filter into your HVAC system - this puts you at the risk of mold.