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Smart AC Solutions
Portable Air Conditioners

How Long to Leave Portable Air Conditioner Upright?

ByRalph P. Sita Updated onFebruary 2, 2025

When considering how long to leave your portable air conditioner upright before use, it’s important to consult the specific make and model, as requirements can vary significantly. For instance, some models necessitate that the unit remains upright for a full 24 hours, allowing the refrigerant to properly transition from gas to liquid—a process critical for optimal performance. To ensure you follow the correct guidelines, always refer to your owner’s manual for specific instructions tailored to your air conditioner.As a general rule of thumb, it is advisable to err on the side of caution. Leaving the unit upright for the recommended 24 hours helps guarantee that it is ready for efficient cooling. If circumstances require you to leave the portable air conditioner upright for an extended period, remember to regularly empty the water reservoir and monitor the unit for any potential leaks. Failing to do so could result in inefficient operation or even damage to your flooring and furniture. Ultimately, adhering to these best practices will maximize the longevity and effectiveness of your portable air conditioning unit.

How Long to Leave Portable Air Conditioner Upright

Page Contents

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  • Why Does Portable Ac Need to Be Upright for 24 Hours?
  • Is It Ok to Lay a Portable Air Conditioner on Its Side?
  • Can You Lay a Portable AC unit on Its Back?
  • Direct draining a portable AC unit…HELLZ YEAH!!
    • Related Articles

Why Does Portable Ac Need to Be Upright for 24 Hours?

If you’re considering buying a portable air conditioner, you may be wondering why the unit needs to be upright for 24 hours before use.

Here’s what you need to know about this critical requirement.

When a portable air conditioner is shipped, the refrigerant inside the unit is in a gaseous state.

In order for the unit to work properly, that refrigerant must be in a liquid state.

The process of converting the refrigerant from a gas to a liquid is called “charging.”

Charging the refrigerant requires time and pressure, both of which are provided by gravity when the unit is in an upright position.

That’s why it’s important not to tilt or move the air conditioner during that 24-hour period; doing so could prevent proper charging and result in your portable AC not working correctly.

Why Does Portable Ac Need to Be Upright for 24 Hours

Is It Ok to Lay a Portable Air Conditioner on Its Side?

As long as the portable air conditioner is properly secured and level, it should be fine to operate on its side.

This will help distribute the weight evenly and prevent tipping.

However, make sure that the air intake and exhaust vents are not blocked by anything while the unit is in operation.

Can You Lay a Portable AC unit on Its Back?

The answer is no. It would be best if you never lay a portable air conditioner on its back because it can cause the unit to leak.

Portable air conditioners have a tendency to leak anyway, so you don’t want to risk it by laying the unit on its back.

If your portable AC does start leaking, it could damage your floor or furnishings.

So, what should you do if you need to move your portable air conditioner?

The best way to move the unit is by carrying it upright.

Make sure that you secure the unit in place before moving it so that it doesn’t tip over and spill water everywhere.

Overall, it’s best to avoid laying your portable air conditioner on its back.

If you absolutely must move the unit, be sure to carry it upright and secure it before moving it.

This will help prevent any accidents and keep your home safe from water damage.

Direct draining a portable AC unit…HELLZ YEAH!!

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Ralph P. Sita
Author: Ralph P. Sita

Ralph P. Sita is a seasoned professional with deep roots in both the HVAC and tech industries. His family’s business, Ralph P. Sita, Inc., is a locally owned and operated HVAC contractor with over 42 years of experience, serving the DC, Maryland, and Virginia areas. The company specializes in residential, commercial, and industrial heating, ventilation, and air conditioning services, offering everything from installation and maintenance to custom ductwork and indoor air quality solutions -www.ralphpsita.com. A former CPA, he spent the last decade as co-founder and co-CEO at Cybrary, a leading platform for cybersecurity and IT training. Cybrary became the largest, most well-known cybersecurity training businesses in the industry under his leadership. Smart AC Solutions is an opportunity to give back to the HVAC community by providing reliable, actionable information on all things heating and cooling.

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Ralph P. Sita

Ralph P. Sita is a seasoned professional with deep roots in both the HVAC and tech industries. His family’s business, Ralph P. Sita, Inc., is a locally owned and operated HVAC contractor with over 42 years of experience, serving the DC, Maryland, and Virginia areas. The company specializes in residential, commercial, and industrial heating, ventilation, and air conditioning services, offering everything from installation and maintenance to custom ductwork and indoor air quality solutions -www.ralphpsita.com.

A former CPA, he spent the last decade as co-founder and co-CEO at Cybrary, a leading platform for cybersecurity and IT training. Cybrary became the largest, most well-known cybersecurity training businesses in the industry under his leadership.

Smart AC Solutions is an opportunity to give back to the HVAC community by providing reliable, actionable information on all things heating and cooling.

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