Why Is My Walk-In Cooler Not Cooling?

Last Updated: October 2026

In our view, a warm walk-in is a stock problem first and an equipment problem second. Whatever is inside needs a decision before anyone works out why the box lost temperature, and if food sat warm for any length of time, ask your local health inspector before serving it.

This guide covers the temperature to hold, the checks staff can make safely without tools beyond a thermometer, the door and climate factors that affect a walk-in in Kenner, and the point where a technician is needed. Big Easy AC Heating lists commercial refrigeration among its services and Kenner among its service areas.

How Cold Should a Walk-In Cooler Be?

Cold enough to hold food at 41°F (5°C) or less. Section 3-501.16 of the FDA Food Code 2022 states that time and temperature control for safety food “shall be maintained” at 5°C (41°F) or less, apart from stated exceptions such as food being prepared, cooked or cooled. The Food Code is a model that states and local authorities adopt, so check with your local health inspector which requirements apply to your business.

Use 41°F as the working line while you investigate. If a thermometer inside the box reads above it, move the most sensitive stock to another cold unit first, then work through the checks below.

What Should You Check First?

The things staff can see without opening any panels. We suggest these checks are visual only: no removing covers, no touching electrical parts, no cleaning coils with water, and no ladders or roofs. Keep clear of fans, and make sure the inside door release works before anyone steps into the box.

1. Read a separate thermometer placed inside the box, not only the display on the door.
2. Check the thermostat or controller setting has not been changed.
3. Close the door and watch whether it shuts fully on its own.
4. Look at the strip curtain or other door covering for missing or torn strips.
5. Look for heavy frost on the indoor coil, and for stock stacked against the fans or blocking airflow.
6. If the condensing unit is outdoors at ground level, look from a safe distance to see whether it is running and whether its coil is covered in dirt or debris.

Write down what you find, with the time and the inside temperature. A short record like that helps whoever comes out to work through the problem in order, and it gives you a starting point if anyone later asks when the problem was noticed.

If the outdoor unit is silent while the box is warm, or the indoor coil is a block of ice, stop there and call for service. In our view, those point to a fault rather than a setting or a door, and they are not something to work on without a technician.

Is the Door Letting Warm Air In?

It is worth ruling out early, because the federal energy conservation standard for walk-ins covers the door directly. Under 10 CFR 431.306, walk-in coolers manufactured on or after January 1, 2009 must have automatic door closers that firmly close doors that have been closed to within 1 inch of full closure, with exceptions for doors wider than 3 feet 9 inches or taller than 7 feet.

The same standard requires strip doors, spring hinged doors or another method of minimizing infiltration when doors are open, and wall, ceiling and door insulation of at least R-25 for coolers. A closer that no longer pulls the door shut, a strip curtain with missing strips, or a door propped open during a delivery all work against those features. Our page on energy efficiency in commercial refrigeration covers keeping a commercial unit running efficiently.

In our view, a door that does not seal is one of the cheapest things to rule out, because staff can test it in seconds. Our guide to commercial HVAC for business owners is a useful companion read for the rest of the building.

Does Kenner Heat Make a Walk-In Work Harder?

In our view yes, and the climate record shows why. NOAA’s weather station at Louis Armstrong New Orleans International Airport, which the airport lists at 1 Terminal Drive in Kenner, has 1991 to 2020 normals of about 85 days a year at 90°F or hotter, an average summer high of 90.9°F and an average summer low of 75.9°F.

Our reasoning, rather than a measured result, is that an outdoor condensing unit rejecting heat into that kind of summer has less margin than the same unit in a milder place, so small problems show sooner. ENERGY STAR’s general heating and cooling maintenance checklist makes a related point for home comfort systems: dirty coils reduce a system’s ability to cool and make it run longer, and too much or too little refrigerant makes a system less efficient.

That checklist is written for home systems rather than walk-ins, so treat it as a pointer rather than a rule for refrigeration equipment. A walk-in that copes in March and struggles in August is, in our view, worth having checked before the next heat wave. Our piece on the hottest temperatures recorded in New Orleans shows how far the extremes can go. Placement matters as well, and our page on setting up a commercial refrigerator covers keeping units away from direct sunlight.

When Is It a Job for a Technician?

When the visual checks come back clean and the box is still warm, or straight away if the compressor will not run, the coil is iced solid or you suspect a refrigerant problem. In our view, anything past the checklist above belongs with a technician.

The EPA requires technicians who maintain, service, repair or dispose of equipment that could release ozone depleting refrigerants to be certified, and in our view refrigerant is best left to a certified technician whatever type your unit uses. Our refrigeration page notes that we offer services from preventive maintenance to repairs and replacements. You can read about our commercial refrigeration services, and our HVAC repair guide is another related read.

Regular maintenance is the other half. As our refrigeration page puts it, maintenance is required on a regular basis, and our year-round maintenance schedule shows how seasonal checks fit together.

Frequently Asked Questions

What temperature should a walk-in cooler be set at?

Low enough to hold food at 41°F (5°C) or less, the cold holding level in the FDA Food Code 2022. Your local health inspector can confirm the requirement that applies to you.

Should staff add refrigerant to a walk-in cooler?

We advise against it. The EPA requires technicians who maintain, service or repair equipment that could release ozone depleting refrigerants to be certified.

Does Big Easy AC Heating serve Kenner for commercial refrigeration?

Big Easy AC Heating offers commercial refrigeration services, from preventive maintenance to repairs and replacements, and lists Kenner as a service area.

If your walk-in is running warm, move the most sensitive stock first, then call 504-608-4636 or use our contact page. You can also see our Kenner service area.