Winter Is Harder on Your Outdoor Walk-In Than Summer. Here's How to Get Ready.

It's easy to assume winter gives your walk-in a break. It's cold outside, so the cooler shouldn't have to work as hard.

Refrigeration systems don't work that way. Walk-ins are designed to run within a certain range of outdoor temperatures. When a Utah cold snap pushes the outdoor unit well below that range, new problems can appear. Pressures drop too low, drain lines freeze, snow piles up on roofs and freezer doors stick shut. Many of these failures start without much warning.

If your condensing unit is outside, on a roof or the entire walk-in is outdoors, fall is the time to prepare. Here are eight things to check before the first hard freeze.

1. Make sure head pressure control is working

This is the most important item on the list. A refrigeration system needs enough pressure on the high side to push refrigerant through the expansion valve. When very cold air blows across the condenser, that pressure can drop too low. The evaporator doesn't get enough refrigerant, so the system short cycles, the coil can ice up and the box warms up, all while it's freezing outside.

Systems built for cold climates use head pressure controls, such as fan cycling, variable-speed condenser fans or a head pressure control valve. Ask your technician to confirm yours is installed, set correctly and working.

2. Check the crankcase heater

When a compressor sits idle in the cold, refrigerant can move into the compressor and mix with the oil. At the next start, that mixture can foam and strip lubrication from moving parts. A crankcase heater keeps the compressor warm enough to prevent this. It's a small part that protects your most expensive component, so have it checked in the fall. Our compressor maintenance guide covers the rest of the compressor checklist.

3. Make sure an outdoor cooler won't freeze your product

If the whole walk-in cooler sits outside, the problem can reverse in deep cold. The refrigeration system shuts off, but the box keeps losing heat through the walls. Produce, beverages and dairy stored near the walls can freeze. Some outdoor coolers need a heater or controls that can add heat when it's very cold. If yours has never been through a hard winter, ask about it now. Our guides on installing a walk-in outside and indoor vs outdoor walk-ins cover the design side.

4. Protect the condensate drain lines

Every defrost cycle sends water down the drain line. If that line runs through an unheated space or outdoors, it can freeze. Water then backs up into the drain pan, overflows and refreezes on the coil or the floor. Freezer drain lines usually need heat tape. Check that the heat tape is working and that the line slopes correctly and drains freely.

5. Plan for snow on the roof

Outdoor walk-in roofs are built for a specific snow load. Heavy, wet Wasatch Front snow adds up quickly. Decide now who will clear the roof after big storms and how they'll do it safely without damaging the roof membrane. While you're looking, check roof seams, caps and flashing. A small leak lets water into the insulation, where it freezes and does more damage every cycle.

6. Keep the condenser clear

Clean fall leaves and debris out of the condenser coil. Over the winter, keep snow drifts off it and make sure plow crews don't pile snow against it. Don't wrap or tarp the condensing unit unless the manufacturer says it's okay. It still needs airflow to run. For rooftop units, keep a clear, safe path so a technician can reach the equipment in January.

Rooftop units and long line runs are exposed to both summer sun and winter snow. Inspect them before the weather turns.

7. Check door heaters and gaskets

Cold makes gaskets stiff, and outdoor doors face freezing rain and blowing snow. On freezers, a failed frame heater can freeze the door shut. Pulling it open can tear the gasket. Check that the heaters work, gaskets are soft and sealing and the threshold drains away from the door so ice doesn't build up there. Our 5-minute door audit walks through each check.

8. Inspect insulation and electrical

Utah's high-altitude summer sun is hard on foam pipe insulation. Look for cracked, crumbling or missing insulation on refrigerant lines and replace it before winter. Check that outdoor disconnects and conduit connections are sealed against moisture. Wet electrical connections in freezing weather cause many unexpected no-cooling calls.

Don't forget winter storms

Winter storms can knock out power. Make a plan before one hits: who gets alerted, where product goes and who you'll call. Our guide to how power outages affect your walk-in includes a response timeline you can print.

Common questions

When should I schedule fall maintenance?

Before the first hard freeze, while it's still comfortable to work on the roof and you have time to order parts. Early fall is ideal. See the best time for walk-in maintenance for a full-year schedule.

My walk-in is indoors. Do I need to worry?

If the box is indoors but the condensing unit is on the roof or outside a wall, items 1, 2, 6 and 8 still apply. Only fully indoor, self-contained systems avoid most winter problems.

Book your fall checkup

Touchstone services outdoor and rooftop walk-in coolers and freezers throughout Utah. We can check the items on this list before the weather turns. Contact Touchstone or call (801) 448-0915 to get on the schedule.