Installing commercial refrigeration in non-AC areas at 43 °C

What 43 °C means for a refrigerator

Climate classes describe the room temperature an appliance is designed to work in. For household appliances, class T (tropical) covers ambient temperatures up to 43 °C under IEC 62552. Commercial cabinets are tested under their own standards at declared climate classes, so the label language differs, but the question is the same: at what room temperature will this unit still hold its rated cabinet temperature?

Ask that question directly. A cabinet that holds +4 °C in a 32 °C room may sit several degrees warmer in a 43 °C shop, especially with frequent door openings. For freezers, the effect is similar: pull-down slows and the cabinet may not reach −18 °C during the hottest hours.

Choosing equipment for hot rooms

• Ask for the rated ambient or climate class and the cabinet temperature it holds at that ambient.
• Prefer fan-assisted cooling for faster recovery after door openings.
• Look for thicker insulation and good door gaskets; heat gain through walls is higher in a hot room.
• Chest freezers lose less cold when opened because cold air stays in the well.
• For glass-door units, ask about the glass specification and door heaters; glass gains more heat than insulated walls.
• Check the voltage operating range too: hot summer evenings often bring the lowest voltage.

Placement in a non-AC space

Find the coolest practical spot. Inside walls stay cooler than west-facing outer walls. Floor level is cooler than near the ceiling. A shaded corner beats a spot in afternoon sun.

Avoid tin-roof sheds and lofts under bare roofs where heat builds up all afternoon. If equipment must sit in such a space, a false ceiling, roof insulation or reflective roof coating can reduce the heat load on everything in the room.

• Keep units away from direct sun, including sun that reaches them for a few hours in the afternoon.
• Leave generous clearance; hot rooms need more airflow, not less.
• Space multiple units apart so each one breathes room air, not its neighbour's exhaust.
• Do not place the unit next to a generator, inverter battery bank or other heat-producing equipment.

Get the heat out of the room

Every refrigerator adds heat to the room it stands in. In a small closed store with two freezers and a visi cooler, the room can warm through the day until all three struggle. An exhaust fan high on the wall and an intake low on the opposite side gives the warm air somewhere to go. Even a ceiling or wall fan that moves air past the condenser grilles helps.

Where shutters are closed overnight, the room heats up with no air movement. Consider louvres or a timed exhaust fan so the space does not start the next day already hot.

Operating habits that help in the heat

• Load warm stock gradually rather than filling a cabinet with crates straight off a hot delivery van.
• Keep doors shut; train staff to decide what they need before opening.
• Do not overload shelves; air must circulate around products.
• Clean the condenser more often in summer; dust and heat together are the main enemies.
• Check door gaskets before summer and replace torn ones.
• Watch the thermometer at the hottest time of day, not only at opening.

Power cuts in hot rooms

Outages are more damaging when the room is hot because cabinets warm faster. Keep doors closed during cuts, know how long your units hold temperature, and decide in advance which stock moves first if an outage runs long. When power returns, allow controller restart delays to work rather than switching units on and off repeatedly.

Safety note

Hot rooms are hard on wiring and plugs as well as compressors. Have sockets and connections checked by a licensed electrician before summer, especially if you see discoloured plugs or smell burning plastic.