The Tool Desk
Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →The biggest surprise on an electric bill is often not a tiny charger left plugged in. It is a heater, water heater, dryer, pump, or other appliance that draws substantial power or runs for hours. To find the real cost, look at both power and time: a 1,500-watt heater running for two hours uses 3 kilowatt-hours (kWh), while a 5-watt router running continuously uses about 43.8 kWh in a year. Your electricity rate, climate, equipment, and habits determine what matters most in your home.
Why an appliance can use more energy than it seems
There are three common ways a device can drive energy use:
As an Amazon Associate I earn from qualifying purchases.
- High power while operating: Space heaters, kettles, hair dryers, and ovens can draw substantial power, even if used briefly.
- Long operating hours: Refrigerators, freezers, routers, aquarium heaters, and dehumidifiers may run or cycle for much of the day.
- Hidden idle or standby use: TVs, game consoles, computers, printers, and smart-home equipment may draw power while apparently off.
Watts describe the rate of electricity use at a moment; kilowatt-hours measure energy over time. A high-wattage appliance is not automatically the largest annual expense. A short burst of high power may use less energy than a smaller device running continuously.
Which household devices are worth checking first?
This is a practical screening list, not a universal ranking. The biggest load in a home depends on climate, fuel type, equipment efficiency, runtime, thermostat settings, and electricity rates.
#1 Best Overall
- 【Insightful Energy Tracking】Track your plug's energy use with clear and easy-to-understand statistics and intuitive charts, helping you optimize power usage.
- 【Estimate Your Energy Bill】 Enhance energy management by integrating with billing systems for clear cost visualization (both single and periodic readings). Additionally, programmable scheduling allows automatic operation of high-consumption devices during off-peak hours with lower electricity rates, resulting in cost savings.
- 【Smart Charging for Devices】Automatically cuts power once your device reaches the low-battery limit you set, preventing overcharging.
- 【Auto-Shutoff】Prevents electrical overload by automatically shutting off devices that use too much power.
- 【Voice & Remote Control】 With built-in support for both Alexa and Google Assistant, issue simple voice commands to adjust settings, turn devices on or off, or even access specific functions without lifting a finger. Manage Tapo P115 and its connected devices from anywhere with the user-friendly Tapo app.
| Device or group | Why it can be underestimated | First useful check |
|---|---|---|
| Electric heating and cooling | Long seasonal runtimes can outweigh many smaller loads. | Review usage and schedules; check filters, airflow, and thermostat settings. |
| Electric water heater | The tank can use electricity to replace heat lost while stored water cools. | Check for leaks, hot-water recirculation, and unnecessary demand. |
| Clothes dryer | Repeated electric-resistance cycles can add up, especially with frequent laundry. | Clean the lint screen and check the vent for restricted airflow. |
| Pool pumps, hot tubs, and other pumps | Circulation can run for many hours; heating water adds a separate, potentially larger load. | Review schedules, pump settings, and whether equipment is heating. |
| Dehumidifier or portable air conditioner | Long runtimes can make a portable unit a significant load. | Check filters, drainage, settings, and the source of moisture or heat. |
| Refrigerator, freezer, or second refrigerator | It cycles around the clock, including when rarely used. | Check seals, ventilation, location, and multi-day energy use. |
| Kitchen appliances | Some draw heavily while operating; a heated carafe or ready mode can extend use. | Look for prolonged warming or standby, not just peak watts. |
| Electronics and network gear | Many small idle loads can accumulate, although each may be modest. | Measure a grouped entertainment or office setup before adding controls. |
High-use heating, cooling, and water heating
Heating and air conditioning
Central air conditioners, heat pumps, electric furnaces, baseboard heaters, room air conditioners, portable air conditioners, and space heaters can all matter. Their use varies with outdoor temperature, insulation, air leakage, equipment efficiency, and how long the system runs. A space heater used in one room may be a noticeable local load; whole-home electric heating can be much larger. There is no reliable single ranking without those conditions.
Before replacing equipment, check filters and airflow, thermostat schedules, and obvious drafts. Portable air conditioners can be less efficient than an appropriately sized window or central system. ENERGY STAR’s product finder includes relevant categories such as room air conditioners, heat pumps, and smart thermostats; certification helps with screening but does not establish the lowest total cost for every home.
Electric water heaters
An electric tank water heater uses energy to heat water and to replace heat lost while water sits in the tank. Long showers, baths, leaks, high temperature settings, and continuously operating recirculation can add demand. Heat-pump water heaters have a different energy profile from electric resistance tanks, but whether one fits depends on installation conditions, climate, space, noise, condensate drainage, and electrical capacity.
Free tools Windows power users keep installed
One-click scans. No signup required.
Fix leaking fixtures, insulate accessible hot-water pipes, and review recirculation schedules where practical. Change a water-heater setting only within manufacturer guidance and applicable safety advice. When comparing replacements, use the EnergyGuide label and consider lifetime operating cost, installation, and available rebates, not purchase price alone. ENERGY STAR lists heat-pump water heaters in its product finder.
Dryers, pools, and dehumidifiers
Clothes dryers
Electric resistance dryers use electricity for heat as well as the drum and controls. Gas dryers use gas for heat but still draw electricity for the motor and controls; their gas use is a separate part of the household energy bill. Heat-pump dryers use a different, generally lower-electricity approach than resistance heating, but can have longer cycles, a higher purchase price, and different maintenance needs.
Rank #2
- 【Matter-Certified】Matter-certified devices, regardless of brand, can work together and are compatible with most major smart home platforms like Amazon Alexa, Apple HomeKit, Google Home, and Samsung SmartThings. Enjoy more flexible and unified control.
- 【Insightful Energy Tracking】 Monitor your energy consumption with in-depth statistics and clear visuals, helping you optimize power usage.
- 【Estimate Your Energy Bill】 Enhance energy management by integrating with billing systems for clear cost visualization (both single and periodic readings). Additionally, programmable scheduling allows automatic operation of high-consumption devices during off-peak hours with lower electricity rates, resulting in cost savings.
- 【Overcharge Prevention & Power Management】 Automatically cuts off power based on user-set thresholds and durations to prevent overcharging, conserve energy, and protect connected devices from overcurrents by shutting off when power exceeds set limits.
- 【Voice & Remote Control】 With built-in support for both Alexa and Google Assistant, issue simple voice commands to adjust settings, turn devices on or off, or even access specific functions without lifting a finger. Manage Tapo P110M and its connected devices from anywhere with the user-friendly Tapo app.
The U.S. Energy Information Administration’s preliminary 2024 Residential Energy Consumption Survey data, released in March 2026, report about 111.33 million U.S. homes with a clothes dryer, including about 90.96 million with electric dryers (EIA 2024 dryer data). To reduce wasted runtime, clean the lint screen every load, keep the vent system clear as directed by the manufacturer, avoid overloading, choose the lowest practical dryness setting, and air-dry when convenient. Compare certified models in the ENERGY STAR product database rather than assuming all dryers use similar energy.
Pool equipment and hot tubs
Pool circulation pumps may run for many hours. Pool heaters and hot tubs have the additional task of heating water, so they can be much larger loads than circulation alone. Pump speed, filter condition, plumbing resistance, schedule, and climate all affect use. ENERGY STAR includes pool pumps among its certified products in the product database. A variable-speed pump may reduce electricity use, but correct sizing, programming, and installation matter.
Pond and fountain pumps, well and irrigation pumps, and outdoor refrigerators or freezers are other easy-to-miss loads. Check their runtimes and whether they are needed on their current schedule.
Dehumidifiers and portable air conditioners
A dehumidifier in a damp basement, laundry room, or humid climate may run for long periods. A nearly continuous runtime can point to a full tank or drainage problem, dirty filter or coils, an unsuitable humidity setting, or a continuing moisture source such as water intrusion. Check those conditions before buying a larger unit. Dehumidifiers also release heat into the room, so that heat may matter in a cooled space. ENERGY STAR includes dehumidifiers in its product finder.
Appliances that quietly run around the clock
Refrigerators and freezers
Refrigerators and freezers cycle day and night. An older second refrigerator in a hot garage can be particularly worth measuring, but age alone does not prove that replacement will pay back. Check that door gaskets seal evenly, required clearance is maintained, and the appliance is used within its rated ambient conditions. Clean condenser areas only as the manufacturer permits. Ice makers and automatic defrost systems also affect use.
Rank #3
- 【Insightful Energy Tracking】Track your plug's energy use with clear and easy-to-understand statistics and intuitive charts, helping you optimize power usage.
- 【Estimate Your Energy Bill】 Enhance energy management by integrating with billing systems for clear cost visualization (both single and periodic readings). Additionally, programmable scheduling allows automatic operation of high-consumption devices during off-peak hours with lower electricity rates, resulting in cost savings.
- 【Smart Charging for Devices】Automatically cuts power once your device reaches the low-battery limit you set, preventing overcharging.
- 【Auto-Shutoff】Prevents electrical overload by automatically shutting off devices that use too much power.
- 【Voice & Remote Control】 With built-in support for both Alexa and Google Assistant, issue simple voice commands to adjust settings, turn devices on or off, or even access specific functions without lifting a finger. Manage Tapo P115 and its connected devices from anywhere with the user-friendly Tapo app.
Measure over several days rather than relying on a brief reading that might catch the compressor off. DOE provides a refrigerator and freezer energy-rating database searchable by appliance type, brand, model, and manufacturing year. Do not simply switch off a food-storage appliance: empty it, clean it, dry it, and store it safely first.
Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Aquariums and network or security equipment
Aquarium heaters and pumps, Wi-Fi routers and mesh nodes, security cameras, and alarm equipment may operate continuously. Their individual draw can be modest, but long runtime makes measurement more informative than a quick watt reading. Keep connected equipment that supports security, alarms, remote access, or other essential functions powered.
Standby power: what to unplug and what to leave alone
A device can be operating, idle and ready, in a lower-power standby state, or disconnected from mains power. Standby means the product remains connected while using its lowest-power state; the U.S. Department of Energy describes standby measurement and the IEC 62301 context in its standby-power guidance. Some devices maintain network access, clocks, updates, remote-control readiness, or charging when they appear off.
Federal guidance that agencies buy products using 1 watt or less in standby when compliant products are available is a procurement benchmark, not a claim that every consumer device meets that level. DOE says ENERGY STAR-certified TVs meet the benchmark in its low-standby product guidance and television purchasing guidance.
Standby use is real, but do not assume each charger or indicator light is a major bill driver. The useful candidates to measure are grouped TV and game-console setups, computer desks, printers and peripherals, and other noncritical electronics. A properly rated smart power strip can switch a group together, but may disrupt timers, updates, network access, or settings.
Rank #4
- Real-Time Energy Monitoring: Smart plugs track the real-time power, current, and voltage of your plug-in devices on Govee Home App. Supports reviewing data daily / weekly / monthly and up to 1 year to effectively save energy and reduce waste.
- Stable WiFi & Bluetooth Connectivity: Connecting with Govee Home App via WiFi and Bluetooth to access the Smart Plug easily, even away, you can remotely control your home appliances and never come back to a dark home. Note: Do NOT support 5G Wi-Fi.
- Convenient Voice Control: Free hands by using simple voice commands with Alexa and Google Assistant. Just once setting, you can enjoy coffee immediately after waking up and experience a leisurely morning. It's also a caring choice for the elderly.
- Scheduling & Group Control: Smart plugs with timer help create detailed to the minute schedules power your appliances on/off automatically for helping save energy and money. And supports share on the Govee Home App to enjoy the smart life together.
- Safe and Comfortable Smart Home: Govee plug not only fully FCC & ETL certified, but also made of fire-resistant materials. 15A 120V smart outlet is suitable for high-power appliances such as coffee maker, brings you a stable and safe life assistant.
- Usually suitable to consider: noncritical entertainment or office equipment that can safely lose power when not in use.
- Keep powered unless you understand the consequences: refrigerators and freezers, medical equipment, alarms and security systems, required network equipment, and devices with important timers or freeze protection.
Kitchen and laundry habits that add up
Ovens, ranges, toaster ovens, air fryers, kettles, and hair dryers can draw substantial power during use, but their shorter runtimes may limit total energy. Microwaves are also usually used briefly. Coffee makers and espresso machines may be less obvious if a warming plate or ready mode stays on for long periods. Dishwashers use electricity for pumps, controls, and sometimes water heating or drying; the incoming hot-water source and selected cycle change the energy picture. Lower-temperature or air-dry options may help, but savings depend on the model and use.
Washing-machine hot cycles can also affect energy use, particularly where the washer draws and heats water electrically. EIA’s 2024 appliance tables provide U.S. ownership and usage context for household appliances, including washers and dryers. Check your own cycles and settings instead of inferring cost from rated watts alone.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to calculate and measure actual cost
Use your electricity rate
For an appliance with a reasonably stable draw, estimate energy and cost this way:
Annual cost = (watts × hours used ÷ 1,000) × electricity price per kWh
Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesFor example, a 1,500-watt heater used two hours a day consumes 3 kWh a day. A 5-watt device running all year consumes about 43.8 kWh (5 × 24 × 365 ÷ 1,000). Multiply kWh by the rate on your bill. If your rate changes by time of day or includes demand charges, the simple calculation may not capture the full bill impact.
Best Value
- 【Matter-Compatible Smart Home Integration】Works with Matter-certified platforms such as Apple Home, Amazon Alexa, Google Home, and Samsung SmartThings. Users can manage compatible devices across supported apps within the Matter ecosystem.
- 【Energy Monitoring】Tracks energy usage over time to help you understand consumption patterns and make informed decisions about how your devices are used.
- 【Matter: Smooth LAN Control】All Matter-certified devices in your local area network (LAN) will work smoothly even when your home internet goes offline. Matter allows effective communication directly between devices, without the need for a specific 'forwarding' device. For example, a Matter smart switch or sensor can turn on/off a Matter bulb directly without being connected to a cloud service, or other specific action. Once configured, communication and control between Matter devices can be achieved directly on the local network.
- 【Compact & Flame Retardant Design】Avoid blocking additional outlets with its compact design, and plug in your WiFi smart plug with confidence thanks to its UL certified flame retardant design and 2-year limited warranty.
- 【App & Voice Control】Control your WiFi smart plug from anywhere, anytime via the free Kasa App or just give voice commands to Siri, Amazon Alexa, Google Assistant or Samsung SmartThings. Your favorite smart assistant enables you to have a truly hands-free experience.
Measure plug-in appliances over time
- Use a plug-in energy meter or monitoring smart plug designed for the appliance’s voltage and current.
- Connect the meter to the wall outlet, then connect the appliance to the meter.
- Record accumulated kWh and the measurement duration; an instantaneous watt reading alone is not enough for a cycling appliance.
- Measure a refrigerator, freezer, dehumidifier, or air conditioner for at least 24 hours, preferably several days, under representative conditions.
- Multiply measured kWh by your actual electricity rate and compare like periods or operating conditions.
Low-cost meters can be unreliable at very low loads or with some electronic loads. Choose a meter intended for the measurement, and average over time. Do not use an ordinary plug-in meter for hardwired HVAC, electric water heaters, dryers, ovens, or pool pumps.
Use whole-home data when individual plugs are not enough
Utility bills and smart-meter data can confirm whether household use rises at particular times or seasons. A panel-mounted monitor can add circuit-level detail, but installation can expose live conductors and may require a qualified electrician; it is not equivalent to plugging in a consumer meter. Emporia describes its Vue monitor as offering approximately ±2% accuracy, with configuration-dependent mains and branch-circuit monitoring, on its manufacturer product page. Those are vendor-listed specifications, not independent test results.
For renters or others who cannot access a panel, Emporia says its Utility Connect reads compatible smart-meter data wirelessly through an outlet-connected device; utility and meter compatibility vary. It provides whole-home usage data rather than identifying each appliance circuit. A plug-in meter or smart plug can help isolate a suitable individual device; check load ratings, motor compatibility, Wi-Fi requirements, and what happens if connectivity fails.
When to fix, change habits, or replace
- Measure first when the appliance is a significant suspected load and the measurement can be made safely.
- Fix operating conditions such as clogged filters, poor seals, blocked dryer vents, incorrect schedules, or excessive runtime.
- Change low-cost habits if they reduce use without creating food-storage, moisture, safety, or comfort problems.
- Compare replacement options using measured use, repair history, installation cost, remaining service life, EnergyGuide estimates, certification, and local rebates.
- Automate only after checking the load and confirming the control is rated for the device and safe to operate remotely.
Replacement is more compelling when a frequently used appliance has a measured abnormal load, rising repair costs, or a certified alternative with materially lower estimated annual operating cost. It is less compelling when use is rare, savings are small, installation is expensive, the measurement is seasonal or unreliable, or the case rests only on a generic wattage claim. ENERGY STAR’s product finder helps locate certified products; certification does not guarantee the best total cost for every household.
Quick Recap
Important exceptions and safety checks
- Gas appliances: A gas furnace, water heater, or dryer may use little electricity for controls or motors while consuming substantial gas. Keep electricity and total energy use distinct.
- Seasonal and rate effects: HVAC, pools, and dehumidifiers can dominate for only part of the year. Time-of-use rates can make shifting laundry or dishwashing change cost without changing kWh; some utilities also charge for peak demand.
- Solar homes: Appliances still consume energy, but onsite generation, export compensation, and time-of-use pricing affect the bill calculation.
- Shared equipment: Renters may not control central heating, water heating, or pool equipment; use available utility data and focus on loads within your control.
- Smart plugs and strips: Check voltage, current and continuous-load ratings, motor or compressor compatibility, indoor/outdoor rating, and manufacturer instructions. Do not use a consumer smart plug instead of a properly rated disconnect or electrician-installed control for high-current equipment.
- Electrical panels: Use a qualified electrician when installation or measurement requires panel access you are not equipped to handle safely.
- Safety comes first: Do not switch off ventilation, sump pumps, food-storage equipment, medical devices, alarms, or freeze-protection systems merely to cut electricity use.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
