Should I drain the water from my AC unit?

Author: Prof. Jamir Osinski DVM  |  Last update: Tuesday, December 16, 2025

Final Thoughts. Your air conditioner should naturally drain water that was once humidity out of your home. On average, you can expect 5 to 20 gallons of condensate per day. If water is not draining, your climate may be too dry or your system is not functioning properly.

Is it necessary to drain water from an AC?

If your air conditioner doesn't drain properly, the water will pool in the drain pan. This can clog the AC's condensate drain line and eventually cause the system to shut down. Regular air conditioning condensate drain cleaning and maintenance can prevent this issue and keep your AC running smoothly.

What happens if you don't drain the water in an air conditioner?

But if you don't, it could do water damage and allow mold to grow all around your AC unit. This mold can cause health complications and damage to flooring, walls, etc.

How do I know if my AC needs to be drained?

If this service isn't done regularly, you could potentially experience an AC drain line clogged. A clogged AC drain line symptoms include: Musty, moldy smell near your indoor unit or in air from the registers/vents. Standing water near the indoor unit.

How much water should drain from an AC unit?

It's completely normal for your AC to drain 5-20 gallons of water outside of your home (via the condensate drain). It's NOT normal for your AC to drain any amount of water inside your home (around your indoor AC unit).

How often do you have to drain a portable AC?

Is it good to water down your AC unit?

Hosing down an air conditioner

​Yes, you can hose down your ac unit. In fact, spraying water on your air conditioner to clear dirt and other debris, along with a regular/preventative maintenance plan can help keep your air conditioner unit running more efficiently.

How much water should come out of the condensate pipe?

Usually being released in 300ml increments (often the reason you may hear water transportation through the pipes when your boiler is operational).

How do you properly drain an air conditioner?

Drain the Water
  1. Check the Position: Ensure the unit is still slightly tilted towards the exterior, allowing gravity to assist in draining the water.
  2. Open the Drain Plug: If a plug covers the drain hole, carefully remove it to start draining the water.
  3. Monitor the Flow: Allow the water to flow out naturally.

What happens if AC does not release water?

If the air conditioner is not properly draining water, it indicates that there is a leak occurring somewhere else in the system. To address this issue, it is crucial to rely on the expertise of a skilled technician who can first identify the problem among the potential causes.

Do indoor AC units need to be drained?

As with any moist environment, the tank filled with stagnant water can also become a breeding ground for mold. Note that even with units featuring auto-evaporation, you might still need to manually drain your portable AC if you're in a high-humidity environment.

Should AC always drip water?

While a little condensation is normal, larger amounts of water continuously dripping from your air conditioner can be a cause for concern. And the reason for this can be anything from the air conditioner's filter to its air vents. Or you may need to replace it.

How to tell if a condensate line is clogged?

One of the most obvious signs is a puddle of water in your AC's drain pan, which proves the water isn't draining as it should. Other signs include: Standing water near your air conditioner's condenser unit. A moldy smell around the drain or from your system's vents and registers.

What to do when AC is not cooling?

To fix an AC not blowing cool air, ensure the thermostat is set to "cool" mode and the temperature is set lower than the current room temperature. Inspect the air filter as a dirty filter can restrict airflow. Ensure the condenser coils are clean and free of debris. Make sure vents are open and unobstructed.

What happens if you don't drain an AC unit?

If your portable AC unit lacks an automatic shutdown feature, or if it malfunctions, failing to drain the collected water can cause an overflow. This can lead to water damage to the unit itself, your flooring, furniture, and other nearby items.

Do all AC units have drip pans?

Regardless of the type of air conditioning unit you have in your home – a central unit or an interior room air conditioner – it will have at least one, and often two, drip pans. The primary AC drip pan, as noted above, is installed on the coil itself.

Does a portable AC use a lot of electricity?

The three biggest drawbacks of a portable system are: They have extremely low energy efficiency: If we take the sample of an 8,000 BTU (250 square feet of cooling power) portable unit with a standard EER, we can expect the unit to consume between 900 and 1100 watts. That's like a microwave running 24/7.

Why is AC not blowing cold air?

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.

How much water should drain from an air conditioner?

So, how much water should drain from an air conditioner? On average, a functioning air conditioner in a typical home can drain anywhere from five to 20 gallons of water per day. Keep in mind that these numbers are ballpark figures, so don't feel alarmed if your unit shows slightly different behavior.

Why is my AC unit not draining water?

If you notice that your AC doesn't drain water, it may be time to get a new drip pan. If you failed to maintain your unit properly for a long time, the excess moisture has already accumulated standing water in its drip pan. Determining whether or not it can be emptied on your own is crucial to avoid further damage.

How to get water out of an AC unit?

Much like dealing with any clogged pipe, the best answer to how to get water out of ACs is to get rid of the clog itself. Use a wet/dry vacuum or a pipe auger to unclog the condensate drain line on your AC unit. Remove any obstructions by just connecting your vacuum or pipe augur to the drain line.

How often should I put bleach in my AC drain?

Using Bleach in Your AC Drain

Be sure to use a minimum of 2 cups once or twice per year. Be advised, however, that some newer units no longer recommend bleach or vinegar due to oxidation/degradation concerns. In these cases, boiling water is recommended.

Should water be coming out of condensate pipe?

Leaks with a constant flow rather than slow drip can mean a condensate pipe has become disconnected or punctured. If that's the case, it's important to get your HVAC system serviced as soon as possible to avoid additional problems including further damage to your house.

How do I know if my condensate pipe is blocked?

Common condensate issues

Common ways to identify if your condensate pipe is blocked are listening for an unusual gurgling sound when the boiler attempts to start, or the boiler may repeatedly 'lock out' or stop working and display an EA code.

How much water should come out of a drip line?

Most drip tape systems put out ¼ gallon per hour at each emitter. Drip line systems can put out ½ gallon or 1 gallon per emitter or sometimes more depending on what you are watering. So, for tape that puts out ¼ gallon at each emitter, a 300 gallon per hour well will accommodate 1200 emitters.

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