A built-in in the garage or the outdoor kitchen.
Sub-Zero’s service manual tells technicians to advise owners that the unit performs best in a room between 60°F and 90°F, and GE publishes what the heat costs: a Monogram side-by-side runs its compressor 41 to 46 percent of the time at 70°F, and 53 to 55 percent at 90°F. Phoenix’s normal daily high is above 90°F from May through September, and an uncooled garage spends those afternoons past the top of that band. Nothing breaks on a particular day. The machine simply spends about a quarter more of its time running.
On This Page
The Numbers That Decide It
Five published figures, and between them they answer whether a built-in belongs in a garage. Each row names the series it came from.
| What the maker publishes | Note | |
|---|---|---|
| Sub-Zero 600 Series (600-2) | Performs best in a room between 60°F and 90°F | Technicians are told to advise owners of this |
| Monogram ZIS at 70°F | Compressor runs 41–46% of the time | GE’s own running-time data |
| Monogram ZIS at 90°F | Compressor runs 53–55% of the time | About a quarter more running time than at 70°F |
| Monogram ZIS below 55°F | Counts as a low-ambient condition | GE’s guide: the owner is advised of the installation requirements |
| Sub-Zero UC-15I undercounter ice maker | High room temperatures or direct sun can melt the ice quickly | The ice bin is not refrigerated |
Notice that both ends of the band are real. The heat is the famous problem here; the cold is the easy one to miss, and an uncooled garage gets both.
What happens above 90°F.
A condenser gets rid of heat by moving room air across a coil, so the warmer the room the less heat it sheds, and the longer the compressor has to run to hold the same temperature. That is the whole mechanism, and GE’s running-time figures measure it: 41 to 46 percent at 70°F becomes 53 to 55 percent at 90°F. What the heat and the dust change together.
Two consequences follow, and neither is a fault. The first is wear: Sub-Zero lists ambient temperature among the things that move its published design life of about twenty years on average. It does not publish by how much, and neither does GE. How long these last, and what moves it.
The second is ice. Sub-Zero’s troubleshooting for its UC-15I undercounter ice maker says high room temperatures, or an installation in a lot of direct sun, can cause the ice to melt quickly, because the ice bin is not refrigerated. A bin that runs low in July can be the room rather than the machine. What no ice actually means.
And what happens below 55°F.
GE’s guide for the Monogram counts anything below 55°F as a low-ambient condition, which is a category and not a compliment. A refrigeration system is a heat pump: it moves heat out of a box and into the room. Below 55°F, GE’s low-ambient line, the room is no longer the one the machine was designed around, and GE’s answer is to advise the owner of the installation requirements rather than to replace a part.
In a desert this is the easy half to miss. On a winter night an uncooled garage can fall below that line, and the same installation that was too hot in July is now too cold. A machine that spends the year oscillating between the two ends of its band is being asked something no kitchen ever asks of it.
The outdoor kitchen problem.
An indoor-rated built-in fitted into an outdoor bar or a ramada is the sharpest version of all of this. It is not merely a hot room: it is a hot room with sun on the cabinet, dust arriving with every storm, and humidity that arrives in a lump between June 15 and September 30.
What follows from that, in our view rather than from a maker’s list: an ice bin that runs low in summer, a compartment that holds in the morning and drifts by afternoon, a condenser that needs cleaning more often than the same machine in a kitchen. What humid air does to a coil.
None of that makes the installation wrong. It makes it an installation with a maintenance schedule, and the honest version of this conversation is about the schedule rather than about the machine.
What You Can Actually Do
Four things, the first three about letting heat leave the machine, and none of them requiring the unit to be moved.
- 01
Keep the grille clear, and the clearance above it open
Air has to get in through the grille and out again. Anything stacked against the grille, or a run of trim added across it, turns a hot room into a sealed pocket.
- 02
Clean the condenser on the short interval
Sub-Zero asks for the condenser to have been cleaned within the last three months when frost is the complaint, which is the short end of the three to twelve months its general answers give. Out here, work to the short one, with the unit switched off.
- 03
Take the sun off the cabinet if you can
Shade over an outdoor installation is worth more than any setting on the control panel. Sun on a stainless door is extra heat the condenser has to shed.
- 04
Judge it on a cool morning, not a hot afternoon
A machine out there will read differently at 7am and 4pm, and a verdict reached in the afternoon is a verdict about the room. Sub-Zero also asks for twenty-four hours after any change before judging the result.
The visit is $119, waived in full when the repair goes ahead. On a machine installed out there, part of what the visit buys is being told plainly whether the fault is the appliance or the address.
Questions
Can I put a built-in refrigerator in the garage?
It will run, and Sub-Zero’s own manual says what to expect: technicians are told to advise owners that the unit performs best in a room between 60°F and 90°F. A Phoenix garage is outside that band for months at a time, so the compressor runs longer for the same result. Sub-Zero names ambient temperature among the things that move its design life of about twenty years, and gives no figure for how far.
How much harder does it work in the heat?
GE publishes the figure for a Monogram side-by-side: the compressor runs 41 to 46 percent of the time at 70°F, and 53 to 55 percent at 90°F. The machine is not failing at 90°F. It is simply spending about a quarter more of its time running.
Is a cold garage a problem too?
Yes. GE’s guide says the room must be above 55°F to avoid a low-ambient condition, and when it is not, its step is to advise the owner of the installation requirements rather than to replace a part. A Phoenix garage in January can drop below that line overnight.
Why does my outdoor ice maker stop producing in July?
It may not have stopped. On Sub-Zero’s UC-15I undercounter ice maker the ice bin is not refrigerated, and Sub-Zero says high room temperatures, or a lot of direct sun, can make the ice melt quickly. In an outdoor bar in July, a bin that never fills can be the room rather than a broken part.
What can I do if it is already installed out there?
Four things. Three are about heat leaving the machine: keep the grille clear and the clearance above it open, clean the condenser more often than a kitchen unit needs, and shade the installation if anything can be done about sun on the cabinet. The fourth is to judge it on a cool morning rather than a hot afternoon. Sub-Zero asks for the condenser to have been cleaned within three months when frost is the complaint, and out there that is the interval to work to.
Would you refuse to work on one?
No. We repair what is in front of us. What we will do is say plainly when the installation rather than the machine is the reason it failed, because otherwise the same repair comes back next summer.
Sources
- Sub-Zero Built-In (600-2) Series technical service manual: the advice that the unit performs best in a room between 60°F and 90°F.
- GE Consumer Home Services technical service guide 31-9091 (2002) for Monogram side-by-side refrigerators: compressor running 41 to 46 percent of the time at 70°F and 53 to 55 percent at 90°F, anything below 55°F counted as a low-ambient condition, and the owner advised of the installation requirements when the room is not above it.
- Sub-Zero, undercounter ice maker UC-15I troubleshooting: high ambient room temperatures or a lot of direct sunlight causing the ice to melt quickly, and the ice bin not refrigerated.
- Sub-Zero, Wolf and Cove life expectancy: ambient temperature among the things that move a design life of about twenty years on average.
- Sub-Zero, ice or frost build-up in the freezer: the three-month condenser interval.
- National Weather Service Phoenix: the monsoon season, June 15 to September 30. Its monthly climate summaries: 1991–2020 normal highs above 90°F from May through September.
Written from these sources and reviewed on (checked again ) by Aphelion Appliance Repair, Phoenix. Figures belong to the series named beside them and series differ, which is why the rating tag settles it. This page is about indoor-rated appliances installed outside a conditioned room; products sold as outdoor-rated are a different specification.
Read Next
- What a Phoenix summer asks of a refrigeratorRoom heat, condenser dust and monsoon outages, and five checks before you call.
- About twenty years: how long a built-in lastsThe maker’s own design life, and what moves that number.
- Sub-Zero ice maker: no ice, or not enough?Sub-Zero’s own rates and the seven checks before anyone is called.
- Food freezing in the refrigerator, by degreesSub-Zero calls 38°F and 0°F ideal and GE 37°F normal. When food freezes anyway: the display scale, the room, a damper, a sensor or Viking’s MAX REF.
Struggling out there?
Tell us the model, where it is installed and what the room gets to. We answer every day, 7am–6pm.