A second refrigerator in the garage costs most households between $130 and $300 per year in electricity — and an older model in a hot, unconditioned garage can push past that. That's not a one-time cost; it compounds every year the fridge stays plugged in. For a lot of households, it's quietly one of the bigger line items on the electric bill.
None of this means you should automatically unplug it. There are real reasons to have one. But the math is worth knowing before you decide — especially since most people got the second fridge for free and have never thought twice about what it's actually running them.
The basic math
A typical modern refrigerator (18–22 cubic feet, purchased in the last five years) uses roughly 400–600 kWh per year when it's sitting in a conditioned kitchen. At the U.S. average of about $0.16/kWh, that's $64–$96 per year. Efficient models with an ENERGY STAR rating can come in well under that, as we covered in our post on whether ENERGY STAR refrigerators are worth it.
Now move that same fridge to an unconditioned garage. Two things happen. First, in summer, the ambient air can reach 90°F or above. The compressor has to run much longer — sometimes almost continuously — to keep the interior at 37°F. Second, most older fridges (pre-2001, before energy standards tightened significantly) already use 800–1,500 kWh/year even in ideal conditions. Put one of those in a hot garage and you can easily clear 1,500–2,000 kWh annually.
At $0.16/kWh, 1,500 kWh works out to $240 per year. At 2,000 kWh, that's $320. The DOE has noted that an older refrigerator can use two to three times as much energy as a current ENERGY STAR model — and the garage environment makes that gap worse, not better.
How garage temperature changes the numbers
Refrigerators are tested and rated at around 70°F ambient temperature. Every 10°F rise in ambient temperature forces the compressor to work noticeably harder. In a garage that hits 95°F on a summer afternoon, the fridge may run 30–50% longer than its rated average. If you're in a climate where the garage is essentially outdoor temperature for four or five months a year, the annual consumption figure goes up substantially.
Cold winters create a different problem. When the garage drops below roughly 50–55°F, the compressor may not cycle often enough to keep the freezer section at a safe temperature. Some older fridge designs rely on the compressor running to keep the freezer cold — if the surrounding air is already cold enough to satisfy the fridge thermostat, the compressor stays off, and the freezer warms up. That's a food-safety issue, not just an efficiency one. Manufacturers typically spec their fridges for ambient temperatures between 60°F and 95°F. Worth checking your model's manual if your winters get cold.
Actual cost by fridge age
Age is the biggest driver here, more than size or brand. The table below shows realistic annual consumption and cost estimates by era, assuming $0.16/kWh and a garage that averages 10–15°F warmer than a conditioned kitchen over the course of the year.
| Fridge Era | Approx. kWh/Year (kitchen) | Approx. kWh/Year (garage) | Annual Cost (garage, $0.16/kWh) |
|---|---|---|---|
| Pre-1990 | 1,400–2,000 | 1,800–2,600+ | $290–$415+ |
| 1990–2000 | 900–1,400 | 1,200–1,800 | $190–$290 |
| 2001–2010 | 500–900 | 650–1,100 | $105–$175 |
| 2011–present (ENERGY STAR) | 350–550 | 450–700 | $72–$112 |
These are estimates — your actual number depends on your local rate, how full the fridge is kept, and how extreme your garage temperatures get. If you want the real figure for your specific unit, a plug-in energy monitor will show you exactly what it's drawing. Plug it in, let it run for a week, and multiply by 52. That's your annual consumption.
So three real questions to ask yourself
First — do you actually use it regularly, or is it mostly a convenience you talked yourself into? A fridge that's half-empty most of the year and gets genuinely used only around holidays is costing you full-time money for part-time value. That's the most common situation we hear about.
Second — what year is the fridge? If it's pre-2000, the efficiency gap alone is probably costing you $150–$200 more per year compared to a modern unit. If it's pre-1990, you might be looking at $300+ annually just for that one appliance. At some point the "free" fridge becomes an expensive one.
Third — do you actually need refrigeration, or do you need frozen storage? If the main use is overflow frozen food, drinks for parties, and meat from a bulk purchase, a chest freezer is a much cheaper option. A modern 7-cubic-foot ENERGY STAR chest freezer uses around 150–200 kWh per year, which works out to roughly $25–$32 at $0.16/kWh. That's significantly less than even a newer fridge in a warm garage. We compared the two in more detail in our post on chest freezer vs. upright freezer energy use.
When keeping the second fridge makes sense
It's not always the wrong call. If you have a large household, regularly host, buy in bulk, or have specific needs like a dedicated beverage fridge that actually gets daily use, the convenience has real value. The question is whether you're paying a fair price for that convenience. A newer ENERGY STAR fridge in a garage that stays below 85°F in summer might cost you $75–$110 per year — that's a reasonable price for meaningful extra storage.
What doesn't make sense is running a 1994 fridge in a garage that gets to 95°F every summer and paying $300+ per year for it without realizing it. At that point, even if you decide you need extra cold storage, replacing it with a small modern fridge or a chest freezer pays for itself fairly quickly.
What to do if you want to cut the cost
If you're not ready to unplug it completely, there are a few practical moves. Keep the fridge reasonably full — an empty fridge loses more cold air every time you open it and works harder to recover. Cleaning the condenser coils (usually on the back or underneath) can recover 5–15% of efficiency on an older unit, as we detailed in our guide to cleaning refrigerator coils. And if your garage has insulation and you're heating it in winter, check whether the fridge is actually running so rarely in cold months that it's not keeping the freezer section safe.
If you use the second fridge heavily only in certain months, unplugging it seasonally is legitimate. Six months unplugged cuts six months of cost. Just prop the door open slightly when it's off so moisture doesn't build up and cause odors.
If you decide to replace it, look for an ENERGY STAR certified unit sized to what you actually need. A 15-cubic-foot ENERGY STAR fridge will cost you far less per year than a 22-cubic-foot older model, even if the older one was free.
P3 Kill A Watt Electricity Usage Monitor
The simplest way to know exactly what your garage fridge is costing you. Plug it in, let it run for a week, and you'll have a real annual kWh figure — no guessing required. Works on any 120V appliance.
Check Price on AmazonMidea ENERGY STAR Chest Freezer (7 cu ft)
If your garage fridge is mainly storing frozen items, this is worth considering as a replacement. Around 200 kWh/year — roughly $32 at average rates — compared to $200+ for an older fridge doing the same job less efficiently.
Check Price on AmazonFrequently asked questions
How much does it cost to run a second refrigerator in the garage per year?
Typically $130 to $300 per year, depending on the age and efficiency of the fridge and your garage's temperature swings. An older, pre-2000 model in a hot garage can easily hit $300 or more.
Why does a garage refrigerator use more electricity than one indoors?
The compressor has to work harder when the surrounding air is hot. In summer, a garage can reach 90°F or above, which forces the fridge to run almost continuously rather than cycling on and off as it would in a 70°F kitchen.
Can I put any refrigerator in the garage?
Most standard refrigerators are designed to operate in conditioned space, typically 60°F to 95°F ambient. Very cold garages in winter (below 50°F) can cause the compressor to stop cycling properly, leaving the freezer section warm. Some models are specifically rated for wider temperature ranges — worth checking the spec sheet before placing a unit in an unconditioned garage.
Is it worth unplugging the garage fridge when not in heavy use?
Yes, if you use it mainly for parties or seasonal overflow. Unplugging it for six months of the year cuts that portion of the annual cost in half. Leave the door propped open slightly so it doesn't develop odors while off.
What's the most energy-efficient option if I need extra cold storage?
A modern ENERGY STAR chest freezer used only for frozen items is typically the most efficient choice for extra cold storage — often under $40/year to run. If you need refrigerated (not frozen) overflow space, a newer ENERGY STAR fridge in a temperature-controlled area beats an old garage unit every time.
In short
Measure what your garage fridge actually uses with a plug-in monitor, then compare that to your rate and decide. If it's a pre-2000 model in a warm garage, the annual cost is probably higher than you assumed, and either unplugging it or switching to a small chest freezer is likely to pay for itself within a year or two. If it's a newer efficient unit and you genuinely use it, $80–$110 per year is a reasonable price for real extra storage. The key is knowing the number instead of assuming it's negligible.
Affiliate Disclosure: Some links in this article are Amazon affiliate links. As an Amazon Associate, EcoThrift Home earns from qualifying purchases, at no extra cost to you. See our full affiliate disclosure.