How long does an AC unit need to sit upright?

Author: Sabryna Upton  |  Last update: Thursday, December 25, 2025

Moving a New, Unused Air Conditioner If on its side or back for more than a day, leave it in an upright position and unplugged for 24 hours.

How long does AC need to be upright?

Installing a new air conditioner is exciting, but you must allow it to settle before turning it on. Although an air conditioner can be set in as little as 30 minutes, this is not always the case. The freon in an AC can settle in 22 minutes on average, but it can take up to 24 hours in some cases.

How long does portable AC need to be upright before turning on?

If it was on its side for more than a day, leave standing for 24 hours before running. If it was laying on its side just briefly to service, clean, or adjust, then just a few minutes of stand time will be enough.

How long does a compressor need to be upright before use?

If transported on its side, turn it upright and let it stand for at least four hours.

What is the 3 minute rule for air conditioners?

Depending on the system, an optimal time of 3 minutes is required before switching the system on. If the system is turned on without waiting for at least 3 minutes, the system can start with a pressure load. This pressure load prevents the system from cooling properly, which could affect the system in the long run.

How Often Should Freon Be Added To AC Unit? How Often Should It Be Checked?

How long does an AC need to rest?

Once the AC completes a cycle of about 15 and 20 minutes, it should remain off for 7 to 10 minutes. This helps it cool off before starting another cycle. The stops happen 2 to three times per hour.

What is the new law for air conditioners?

The New Regulations

Starting January 1, 2025, all new residential air conditioners and heat pumps must utilize A2L refrigerants. Older refrigerants like R-410, which are likely the refrigerant used by your current system, are being phased out.

Is it OK to lay an air compressor on its side?

Laying a used upright air compressor on its side can be risky. The sludge will be free to move around the tank in that position, causing potential damage to critical areas of your compressor, especially the tank check valve. The sludge can slow down the valve's motion or prevent it from moving altogether.

How long does freon need to settle?

Freon settles in an air conditioner in a matter of minutes. Though, it depends on the type of air conditioner too. If the air conditioner is portable, it takes about 5-30 minutes for the Freon to settle. This time must be dedicated to the appliance for it to function properly.

How long should an AC unit sit after moving?

Moving a New, Unused Air Conditioner

If on its side or back for more than a day, leave it in an upright position and unplugged for 24 hours.

What happens if you lay an AC unit on its side?

A portable air conditioner should not be tilted, inclined, or positioned on its side or back during operation, as sideways use of an air conditioner will cause damage. As a result of oil depletion and the inability to retain condensate, the compressor could permanently fail.

Is it OK to leave a portable AC on all night?

In most cases, yes. Not only is continuous use better for the health of your unit, but it won't cost you any excess energy. Most AC units will automatically turn themselves off once the room is at the desired temperature, but this isn't the same as shutting the unit down entirely.

How long does a window AC need to be upright before plugging in?

Why does the air conditioner need to be upright for 24 hours before running for the first time? This is necessary so the oils in the compressor settle; not doing so can affect the performance of the unit.

What happens if you dont tilt an air conditioner?

If your system is not in the upright position, condensate water will flow downward, and depending on if you have a partially or completely evaporative system, that moisture cannot be removed properly through the exhaust hose when it is not in the right position. This can create damage to those components.

How long to wait before turning AC back on?

Allow a 3-minute break after turning the AC on or off and reset the circuit breaker 24 hours prior to first use to prevent damage and improve efficiency. Perform a pre-start inspection by cleaning the unit, checking filters and coils, and starting the AC in fan mode before cooling to ensure it runs smoothly.

Do air conditioners need to sit level?

Maintaining a level AC unit is not just about aesthetics- it's about ensuring your HVAC system's efficiency, reliability, and longevity. An unlevel unit can lead to many problems, from compressor damage to water drainage issues, which can result in costly repairs or even the need for premature system replacement.

How long to leave a compressor upright?

When deciding how long you leave a fridge or freezer to settle for once positioned, there are conflicting recommendations. Generally, if you're going to be 100 percent sure that the oil has settled back down into the compressor, you should leave it for 24 hours.

What happens if you don't let freon settle?

Turning the fridge on too soon can lead to a coolant rush, which can cause problems like leaks or blockages. This can damage the fridge, and you may need to pay for expensive repairs. Waiting allows the coolant to settle back into its correct position and ensures that there are no leaks or blockages.

Do you have to wait 24 hours to turn on an air conditioner?

Check Circuit Breaker

Reset it ideally 24 hours before turning on your air conditioning after the winter. However, if there's a problem with the circuit board or you're not sure which breaker controls the outdoor unit, contact a HVAC professional.

What happens if you run an air compressor backwards?

Mechanical damage will be nearly immediate when most compressors are operated in reverse. The valves are particularly vulnerable and will often need to be replaced. The extent of the damage depends on how long the system operated in reverse, but a full maintenance check should be performed.

What not to do with a compressor?

- Do not use air directly from a compressor for breathing purposes unless the system has been designed specifically for breathing air. - If you are using your own pressure vessel, only use those that are built to national or international standards. - Never crimp, couple or uncouple pressurized hoses.

What happens if you leave air compressor on?

Every time you operate your air compressor, the atmospheric air that fills your compressor tank contains a certain percentage of water vapor, and if left alone, this water vapor can accumulate and damage the internal structure of your air compressor.

What refrigerant is being phased out in 2025?

The new EPA refrigerant regulations for 2025 will phase out the use of high-global warming potential (GWP) refrigerants like R-410A, replacing them with more eco-friendly alternatives, such as R-454B and R-32.

Why are 14 SEER being phased out?

The standards have to keep evolving as the technology does or else we'd be stuck in the figurative stone age with our heating and cooling solutions. That's why the United States Department of Energy or DOE has decided to discontinue production of air conditioners with a SEER rating of 14.

What are the new AC requirements for 2024?

Efficiency ratings are regional, so the new HVAC regulations for 2024 depend on where you live. New air conditioners in Northern regions must have a minimum SEER rating of 14. In Southern regions, the minimum SEER rating is 15 for most units.

Previous article
How do you clean years of caked grease?
Next article
How do you remove set in hard water stains?