Last updated: April 15, 2026
The difference comes down to one question most gadget guides skip entirely: what’s actually driving your electricity costs in the first place? Get that wrong and you can spend $500 on smart home technology and save $30 a year. Get it right and the same investment pays back in under two years.
This guide covers which smart home energy upgrades work, which are marginal, what realistic savings look like, and the order to tackle them — based on where your money is actually going, not what the product box claims.
Where Your Electricity Bill Actually Comes From
Before buying anything, it helps to understand what you’re actually paying for. The EIA’s most recent residential energy consumption data breaks down the average US home’s electricity use:
- Heating and cooling (HVAC): 40–50% of total electricity use
- Water heating: ~18%
- Appliances (refrigerator, washer, dryer, dishwasher): ~15%
- Lighting: ~9%
- Electronics and everything else: ~8–18% depending on household
That breakdown determines the value of every smart home device you could buy. If a device targets a category that represents 9% of your bill, its ceiling — even at 100% efficiency — is 9% of your total. If a device targets HVAC, which is 40–50% of most bills, even a modest improvement has real financial weight.
This is why the order you tackle these upgrades matters as much as which ones you choose.
Your own bill breakdown may differ depending on your climate, home size, and how you heat and cool. Homes in Texas, Florida, and Arizona skew heavily toward cooling — HVAC can represent 60–70% of summer bills. Homes in colder climates may carry more of that weight in winter heating. If you want to understand your specific usage before buying anything, your utility’s online account portal typically shows monthly and sometimes daily consumption data. Some utilities, particularly in deregulated markets like Texas and Illinois, provide hourly usage data that makes this analysis much more precise.
For a full breakdown of average electricity costs by state, see our average electric bill guide.
Smart Thermostat: The Highest-Leverage Device
Heating and cooling is where your money goes. A smart thermostat is the device that directly controls it. That’s why it consistently delivers more measurable savings than any other smart home product — and why it’s the right place to start.
What the savings actually look like
ENERGY STAR, which measures real-world performance across thousands of homes, reports average savings of approximately 8% on heating and cooling bills. At the national average HVAC spend of around $600–900 per year, that’s $48–$72 annually. Not the $131–$145 figure Nest advertises, and not the 26% ecobee claims — both of those figures compare against households that never adjust their thermostat at all, which isn’t most people.
The realistic range is 5–15% on your HVAC costs, depending on your situation. On the high end of that range, a homeowner with a $200/month summer cooling bill in Phoenix or Houston could see $120–$360 in annual savings. On the low end, someone in a mild climate with a modest bill might save $40–$60.
When a smart thermostat saves more
The savings increase meaningfully when:
Your schedule is irregular or unpredictable. The thermostat’s home/away detection and geofencing do the work of setbacks you’d otherwise forget to make. Every degree of setback for eight hours saves roughly 1% on that portion of your bill, according to the Department of Energy — the thermostat automates that without you thinking about it.
You’re on a time-of-use electricity rate plan. This is the factor no gadget review covers, and it’s the one that matters most in deregulated electricity markets. TOU plans charge more for electricity during peak hours — typically 4–9 PM in summer — and less during off-peak hours. A smart thermostat that pre-cools your home before peak hours and reduces HVAC runtime during them can deliver savings that go well beyond the ENERGY STAR average, because you’re not just using less energy — you’re shifting when you use it to cheaper windows.
If you’re a ComEd customer in Illinois on the BESH hourly pricing plan, an Ameren customer on a time-variant rate, or a Texas homeowner on a variable-rate plan through ERCOT, this rate structure interaction is significant. A smart thermostat on a TOU plan can perform 40–60% better than the ENERGY STAR average in terms of dollar savings. The device is the same — your rate structure is doing additional work.
When a smart thermostat saves less
The savings are smaller when:
You’re already doing manual setbacks consistently. If you’re already dropping the temperature at night and when you leave, the thermostat has less room to improve on your existing habits.
Someone is home all day. Home/away mode and geofencing don’t help a household where someone is always present. The savings come from setbacks during unoccupied hours — if those hours don’t exist, you’re relying on scheduling and learning algorithms that may not capture much additional efficiency.
You’re on a flat-rate electricity plan with no time-of-use pricing. The thermostat can still save through setbacks, but you won’t capture the rate-shifting benefit that makes TOU plans so valuable in combination with smart thermostats.
Your home is very small or in a temperate climate. If your HVAC bill is $40/month, 8% savings is $3.20. The payback period on a $200 thermostat extends considerably.
Compatibility: the thing to check before buying
Most US homes use forced-air heating and cooling systems — central HVAC with ductwork and vents. Nest, ecobee, and Honeywell Home thermostats work well with these systems.
They do not work with:
- Electric baseboard heaters (line-voltage systems using 120V or 240V wiring directly to the thermostat). If you have individual heaters along the walls with their own thermostats, that’s a baseboard system. Standard smart thermostats are incompatible and can cause serious problems if installed incorrectly.
- Steam radiator systems common in older Northeast homes. These require specialized controls.
- Radiant floor heating. Limited compatibility depending on the control system.
If you’re not sure what system you have, the quickest check: look at your existing thermostat wiring. If there are more than two wires, it’s likely low-voltage and compatible. Two wires only, or thick wires, suggests line-voltage — get a professional to confirm before buying anything.
Also check for a C-wire (common wire). Most smart thermostats need one for consistent power. Many older homes don’t have one. This isn’t necessarily a dealbreaker — some thermostats include an adapter, some can draw power through the heating/cooling wires — but it’s something to verify before purchase. An HVAC technician can confirm your wiring situation in a short visit if you’re unsure.
Home Energy Monitor: A Diagnosis Tool, Not a Savings Device
A home energy monitor — products like the Sense Home Energy Monitor or Emporia Vue — connects to your electrical panel and tracks real-time electricity consumption across your whole home. Some models can identify individual appliances by their electrical signature.
Here’s the honest framing: a home energy monitor does not save electricity by itself. It shows you where electricity is going. The savings come from what you do with that information.
That distinction matters because many homeowners buy an energy monitor hoping it will lower their bill the way a thermostat does. It won’t — not automatically. What it will do is tell you whether your dryer is using more power than expected, whether something is drawing power overnight that shouldn’t be, whether your HVAC is running more than its runtime should suggest, and whether you have appliances in standby mode consuming meaningful power.
When a home energy monitor is worth it
After you’ve installed a smart thermostat and dealt with HVAC — the largest cost driver — a home energy monitor helps you understand what’s left. If you’ve done everything obvious and your bill still seems high, a monitor can surface the non-obvious culprits: an aging refrigerator that’s running constantly, an electric water heater with a failing element, a hot tub heater that’s set too aggressively, a chest freezer in the garage that no one thinks about.
It’s also useful if you’re trying to understand whether a specific appliance replacement would pay for itself. Knowing your refrigerator uses 2.1 kWh/day versus the 1.1 kWh/day a new ENERGY STAR model would use gives you the actual payback math.
When to skip it for now
If you haven’t installed a smart thermostat yet, a home energy monitor is not the right first purchase. You already know where 40–50% of your bill is going — into HVAC. The monitor will confirm that, and you’ll have spent $200–$300 to learn something you already knew.
Start with the thermostat. Once that’s optimized, a monitor helps you find what’s left.
A note on installation
Home energy monitors connect to your electrical panel. The basic installation involves attaching current sensing clamps to the main service lines inside the panel — this is a low-voltage sensing connection, not a wiring modification, but it does require opening the panel. If you’re not comfortable working inside an electrical panel, hire an electrician for the installation. It’s typically a 30–60 minute job.
Smart EV Charger: Only Matters If You Have the Right Rate Plan
If you drive an electric vehicle and charge at home, a smart EV charger can deliver meaningful savings — but only under specific conditions. The savings aren’t from the charger itself. They’re from when the charger runs.
Most EVs take 8–12 hours to charge from a typical daily driving deficit. If you plug in at 6 PM and charge through the night on a flat-rate electricity plan, you’re paying the same rate per kilowatt-hour regardless of when the car charges. A smart charger on a flat-rate plan is mostly a convenience feature — scheduling, app control, energy tracking. It’s not a savings tool.
The situation changes completely on a time-of-use plan. If your off-peak rate is $0.07/kWh and your on-peak rate is $0.35/kWh — a real spread in markets like California (PG&E), Texas (variable-rate plans), and Illinois (ComEd BESH) — scheduling your EV to charge between midnight and 6 AM instead of 6 PM to midnight can save $400–$800 per year depending on how much you drive. That’s on a charge alone, without changing anything else.
Most EVs have built-in charge scheduling that can accomplish the same thing without a smart charger. The smart charger adds data visibility, better integration with home energy systems, and sometimes utility demand response program enrollment. If your EV already has good scheduling software, a basic Level 2 charger with a timer does the same job.
The bottom line: if you have a TOU rate plan and your EV doesn’t have built-in charge scheduling, a smart charger pays for itself. If you have a flat-rate plan or your EV already handles scheduling, it’s a convenience upgrade, not a savings tool.
If you’re not sure whether you have a TOU plan or what your off-peak rate is, check your utility bill or log into your utility account. It’s one of the most financially significant details on your electricity plan and most people have never looked at it.
What’s Not Worth Prioritizing First
Smart plugs and smart power strips
Standby power — electricity consumed by devices that are technically off or in standby mode — is real. Studies estimate it accounts for 5–10% of home electricity use, or roughly $75–$150/year for the average household. Smart plugs eliminate it for specific devices, and smart power strips do it for clusters.
The savings are real but small on a per-device basis. A smart plug on a television setup might save $8–$15/year. A smart strip on an entertainment center might save $20–$30/year. Across your whole home, eliminating standby power could save $50–$100/year — meaningful, but roughly half what a smart thermostat saves in the first year on HVAC alone.
Smart plugs make sense as a later-stage purchase once you’ve addressed the larger cost drivers. They’re also useful for remote control and scheduling of specific appliances — running a dehumidifier on a schedule, monitoring a chest freezer, controlling a space heater. The energy savings are a bonus, not the primary value.
Smart lighting
Lighting is approximately 9% of the average home electricity bill. Smart LED bulbs are energy-efficient and convenient. The problem is that if you’ve already switched to standard LED bulbs — which most households have — the marginal efficiency gain from switching to smart LED bulbs is small. You’ve already captured most of the available savings by going LED.
The real value of smart lighting is behavioral: lights that turn off automatically when you leave a room, or that dim on a schedule, prevent the kind of waste that happens when people forget. That’s real but hard to quantify precisely and varies entirely by household habits.
Smart lighting is worth doing. It’s not where to start.
Smart appliances
A smart refrigerator, washer, or dishwasher won’t save significantly more energy than a standard ENERGY STAR model of the same type. The “smart” features are primarily connectivity — remote control, diagnostics, app integration. The energy savings come from the appliance’s efficiency rating, not from its WiFi connection.
If you’re replacing an old, inefficient appliance, upgrade to an ENERGY STAR model. Whether it’s “smart” matters much less than its efficiency rating.
The Right Order
Given where electricity bills actually come from and what these devices realistically deliver, the order is straightforward:
First: smart thermostat. HVAC is 40–50% of your bill. This is where the leverage is. If you have a compatible system and haven’t installed one, this is the starting point.
Second: understand your rate plan. Before buying anything else, look at your electricity bill and identify whether you’re on a flat rate or a time-of-use plan. If you’re in a deregulated market — Texas, Illinois, Ohio, Pennsylvania, New Jersey, and others — you may have the option to switch to a TOU plan that significantly increases the value of a smart thermostat and smart EV charging. This costs nothing and can change the math on every other purchase.
Third: home energy monitor, if your bill still seems higher than it should after optimizing HVAC. Use it to find the non-obvious cost drivers. Not a first purchase.
Fourth: smart EV charger, if you have an EV and a TOU rate plan and your vehicle doesn’t already handle charge scheduling.
Fifth: smart plugs, strips, and lighting — do these eventually, but don’t start here.
This order isn’t about which devices are most impressive. It’s about which ones have the most financial leverage given where your money is actually going.
A Note on Realistic Expectations
Smart home energy technology works. The savings are real. But the marketing figures — 26% from ecobee, $145/year from Nest — are upper bounds based on favorable comparisons, not typical results.
For most homeowners, the realistic total annual savings from a well-configured smart thermostat is $60–$150. Add a TOU rate plan and that can climb to $150–$300. A smart EV charger on the right rate plan adds another $400–$800 if you drive regularly. A home energy monitor helps you find another $50–$200 in waste once you’ve handled the big categories.
Combined and done in the right order: a realistically managed smart home energy setup can reduce your annual electricity bill by $300–$600 for a typical household. That’s meaningful. It’s not the 30% reduction some guides promise, but it’s real money, and most of it pays back within two to three years on the device cost.
The goal isn’t the gadget. It’s the bill.
For more on understanding your electricity costs, see our electricity cost guides by state: https://exspenditure.com/states/
Frequently Asked Questions
Which smart home device saves the most electricity? A smart thermostat, by a significant margin. Heating and cooling is 40–50% of the average home electricity bill. A smart thermostat directly controls that category and delivers average savings of 8% on HVAC costs according to ENERGY STAR — more if you’re on a time-of-use electricity rate plan. Every other smart home device targets a smaller portion of the bill.
Does smart home technology actually lower your electricity bill? Yes, but the savings depend heavily on which devices you install, in what order, and whether your electricity rate plan is set up to maximize their value. A smart thermostat on a flat-rate electricity plan delivers modest savings. The same thermostat on a time-of-use plan with significant peak/off-peak rate differences can deliver two to three times the savings. The device is the same — the rate structure does the additional work.
Is a home energy monitor worth buying? It depends on where you are in the process. A home energy monitor is a diagnosis tool — it shows you where electricity is going but doesn’t reduce consumption on its own. If you’ve already installed a smart thermostat and your bill is still higher than expected, a monitor can surface non-obvious cost drivers. It’s not the right first purchase if you haven’t addressed HVAC yet.
Do smart plugs save significant money? Not on their own. Smart plugs eliminate standby power on individual devices, which can save $8–$20 per device per year. Across an entire home, eliminating standby power might save $50–$100 annually. That’s real but modest compared to HVAC savings. Smart plugs are more useful for remote control, scheduling, and monitoring specific appliances than for dramatic bill reduction.
What electricity rate plan works best with smart home devices? A time-of-use (TOU) plan — where electricity costs more during peak hours and less during off-peak hours — significantly increases the savings from smart thermostats and smart EV chargers. If you’re in a deregulated electricity market (Texas, Illinois, Ohio, Pennsylvania, New Jersey, and others), you have the option to choose a rate plan. A TOU plan combined with smart devices that shift consumption to off-peak hours is the highest-leverage combination available.
Can I start with just one smart home device? Yes — and you should. Start with a smart thermostat if you have a compatible forced-air HVAC system. Get that working correctly and understand your electricity rate plan before adding anything else. Adding devices without understanding your rate structure or your existing usage patterns often leads to disappointing results.
Data sources: U.S. Energy Information Administration (EIA) Residential Energy Consumption Survey; ENERGY STAR Smart Thermostat Program savings data; U.S. Department of Energy thermostat setback guidance. All figures reflect US residential averages as of 2025-2026 and will vary by home, climate, utility, and usage patterns. This is not financial advice — consult your utility and a qualified energy professional before making significant upgrades.