A Reddit user dealing with colonoscopy prep in 90-degree heat also had to contend with a broken air conditioner, creating a worst-case timing scenario.

Here's what to know

"This is literally worst possible timing in the world," the original poster said, asking if anyone knew a quick and easy fix for the problem. They said maintenance would be unavailable and the heat was expected to continue.

The repeated diagnosis was that the AC line or coil had likely iced over.

"Is that ice?" one commenter asked.

Another advised, "Try turning the AC off, put the blower fan on, for an hour or so. It may thaw things out and allow you to try again with the AC on.".

The replies also listed several reasons an AC can freeze, including low refrigerant, weak airflow, a dirty coil, or blower trouble. No matter the cause, the shared warning was that leaving the system running in cooling mode could worsen the freeze-up.

Palmetto can help homeowners understand their HVAC options and slash their energy bills with new, efficient HVACs and heat pumps. Its Comfort Plan network can help connect households with vetted installers and efficient home comfort solutions.

More background

An AC freeze-up can be confusing in the moment, because a unit may still seem to be running even as it loses its ability to cool. When ice starts forming, it is often a sign that something deeper is wrong and that the system needs a reset — and possibly professional service.

Heating and cooling are typically among the biggest energy expenses in a home. An aging or malfunctioning system can drive up electricity use while delivering worse comfort, especially during extreme heat, when dependable cooling is most needed.

Renters may be limited to basic troubleshooting and contacting maintenance. Repeated breakdowns may signal that it makes more financial sense to explore efficient replacement options rather than keep paying for repairs and high monthly bills.

Efficient HVAC systems and heat pumps can reduce energy waste while improving indoor comfort at the same time, helping families save money while using less power.

What can be done?

For a frozen-looking AC, commenters pointed to the same first step: stop the cooling cycle and leave the fan running so the ice can melt. That can briefly restore airflow, but it will not address the root problem if low refrigerant or a failing part caused the freeze.

Homeowners may want to consider whether repair or replacement makes more sense. Palmetto's Comfort Plan can help here too: If you're not ready to spend up front, the Comfort Plan includes $0-down options that can lower your heating and cooling costs by up to 50%. It also includes 12 years of free maintenance, which can also help reduce the risk of expensive surprises.

Homeowners can also pair solar panels with electric appliances, such as efficient HVAC systems, to push utility costs even lower. EnergySage makes it easier to compare the best solar panel system and installer for your home and budget, with potential savings of up to $10,000.

Where can I learn more?

From AC breakdowns and frozen coils to landlord delays, renters dealing with HVAC problems is nothing new.

• In the Southeast, a sick toddler's home still climbed to 94 after promised AC repairs.

• In New York, an HVAC tech found a frozen AC with no filter in sight.

• An HVAC tech spotted the no-cooling culprit in plain sight.

• In Minnesota, heating repairs during frigid winter became another showdown between a renter and the HOA.

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