What Your Old Appliance Actually Costs to Run

“It is costing you a fortune to run” is the most common argument for replacing a working appliance, and it is used loosely enough that it is worth checking. For some appliances in some households it is decisively true. For others it is a rounding error being used to justify a purchase.

The good news is that this is one of the few appliance questions you can answer precisely, for your own machine, in about ten minutes, with numbers rather than opinions.

Do the maths yourself

There are three ways to get a real number, in increasing order of accuracy.

1. The nameplate and the EnergyGuide label. Every major appliance has a data plate — inside the door, behind the kick plate, on the back — with electrical ratings. Appliances sold in the US also carry a yellow EnergyGuide label at purchase stating estimated annual energy use in kilowatt-hours. If you still have the manual, that figure is in it. Multiply annual kWh by your electricity rate and you have an annual cost.

2. A plug-in energy meter. A $20 to $30 meter between the outlet and the appliance measures actual consumption over time. Leave it on a refrigerator for a week and multiply. This is by far the most useful $25 anyone arguing about appliance running costs can spend, because it measures your machine in your kitchen, not a laboratory average. It will not work for a 240V dryer or a hardwired appliance.

3. Your utility bill. Look at the rate per kWh, not the total. It is on the bill, and it varies enormously across the country — there are states where residential electricity is roughly half what it is in others, and time-of-use plans can make the same kWh cost very different depending on when it is used. Using a national average rate to make a decision in a high-rate or low-rate state will mislead you badly in either direction.

The formula is trivial: annual kWh × your rate per kWh = annual cost. Everything below is about what to expect for that first number.

Refrigerators and freezers

This is the category where the argument usually holds, for one structural reason: a refrigerator runs continuously, every hour of every day, for its entire service life. It is the only major appliance with a 100 percent duty cycle. Small differences in efficiency compound across roughly 8,760 hours a year.

Refrigerator efficiency improved substantially over the last few decades, driven by successive federal efficiency standards and by better compressors, insulation and controls. The practical consequence is that a refrigerator from the 1980s or 1990s can consume several times what a comparable new one does. A unit from the last ten years is much closer to current models, and the saving from replacing it is correspondingly smaller.

Which gives a rough rule:

• A pre-2000 second refrigerator in the garage is the single best replacement candidate in most houses. It is old, it is inefficient, it is often running in a hot space that makes it work harder, and it is frequently half empty. Many utilities run recycling programs that will collect one and pay you a modest incentive; it is worth a search for your own utility's program.
• A ten-year-old main refrigerator that works is usually not worth replacing on energy grounds alone. The saving is real but modest, and it takes many years to offset $1,200.
• A refrigerator that is running constantly is a different case entirely — that is a fault, not an efficiency question, and it is usually fixable for far less than replacement.

Chest freezers are the efficiency exception in the other direction: they are well insulated, they lose little cold air when opened because cold air sinks, and a full one is very cheap to run. A working chest freezer is rarely worth replacing for energy reasons.

Dryers

Dryers are the biggest single-cycle energy user in most laundry rooms. An electric dryer element draws thousands of watts, and a typical load consumes a few kilowatt-hours. Multiply by loads per week and it becomes a real annual number for a large household — and close to noise for a single person doing one load a week.

The important insight about dryers is that condition matters more than age. A dryer's energy use is dominated by how long it runs, and how long it runs is dominated by airflow. A partially blocked vent can add substantially to every cycle for years without anyone noticing, because the change is gradual. Cleaning the vent is free-to-cheap and pays back immediately; replacing the dryer to fix a duct problem replaces the wrong thing. Work through the airflow chain before concluding your dryer is inefficient.

The second dryer variable is the washer. A washer with a high final spin speed leaves less water in the clothes, and the dryer then does less work. If you are replacing a laundry pair for energy reasons, spin speed on the washer is a bigger lever than anything on the dryer.

Heat pump dryers use dramatically less energy than conventional electric ones, at the cost of longer cycles and a higher purchase price. Gas dryers usually cost less per load to run than conventional electric ones where gas is cheap, though the comparison depends entirely on local rates for both fuels.

Washers and dishwashers

For both of these, most of the energy is not the appliance. It is heating the water.

That changes the analysis completely. A washer's electricity consumption for tumbling and spinning is modest; the cost is in the hot water, which comes from your water heater and shows up on whichever fuel that runs on. Which means the single biggest reduction available to you is free: wash in cold. Modern detergents are formulated for it, and for ordinary laundry it works.

Dishwashers are similar, with an added wrinkle. A dishwasher heats its own water and, on most machines, uses a heating element or a fan for drying. Skipping heated dry — using the air-dry or energy-saver option and cracking the door at the end — removes a real chunk of the per-cycle energy. That is also, incidentally, the fix for a lot of poor drying complaints once you understand what your machine is actually doing.

Both appliances have improved in water use more than in electricity use, which matters if you pay for water and sewer by volume. A modern dishwasher genuinely uses less water than washing the same dishes by hand under a running tap.

When running cost changes the decision

Running cost should tip a repair-or-replace decision when three things are all true:

1. The appliance runs continuously or very frequently. Refrigerators and freezers qualify. A microwave used four minutes a day does not, whatever its standby draw.
2. It is genuinely old — old enough to predate a meaningful step in efficiency standards, which for refrigerators generally means twenty years and up rather than ten.
3. You have measured or looked up the number, rather than assumed it.

When those hold, the annual saving is a legitimate line in the replacement calculation. Add it to the repair quote you are weighing and see whether it changes the answer. A $400 repair on a twenty-five-year-old refrigerator that costs meaningfully more per year to run than a new one is a much weaker proposition than the same repair on an eight-year-old one.

When they do not hold — and for most appliances most of the time they do not — make the decision on the ordinary grounds: the cost of the repair against the remaining life and value of the machine. The Appliance Blue Book handles that side, and which appliances are worth repairing past ten years covers where the line sits by type.

Cheap fixes that cut consumption

Before replacing anything on efficiency grounds, do these. Every one is cheaper than an appliance and several are free.

• Clean the refrigerator condenser coils. Free, twenty minutes, and the highest-yield efficiency action available on any appliance in the house. A coil buried in dust forces the compressor to run longer for the same cooling.
• Check the door seals. Close the door on a dollar bill and pull; no drag means no seal. A refrigerator or freezer door gasket runs roughly $40 to $140 and pays for itself if the old one is badly gone.
• Set the temperatures correctly. Around 37°F for fresh food and 0°F for the freezer. Every degree colder than necessary costs energy continuously. Many refrigerators are set colder than they need to be because someone once had a warm-milk complaint.
• Clear the dryer vent, end to end. The single biggest energy lever in the laundry room.
• Clean the dryer lint filter every load, and wash it with soapy water occasionally — fabric softener leaves an invisible film that restricts airflow.
• Wash in cold and skip heated dry. Free, immediate, and larger than most people expect.
• Fill the freezer. Frozen mass holds temperature through cycles. Water jugs work.
• Give any appliance in a hot space room to breathe — see appliances in a heat wave for what a garage does to a compressor's workload.

Do all of that first. If the numbers still say replace, they will say it more convincingly, and you will not have spent $1,200 to solve a $0 problem.