We’ve all seen the articles: “This smart thermostat will save you 23 percent on your energy bill!” Then you buy it, install it, and your bill goes up because you keep cranking the AC to 68 degrees since now you can do it from your phone. The truth is, some smart home devices genuinely save you money, and some are expensive toys that cost more than they’ll ever return. Here are the devices that pay for themselves — and the ones that never will.
The Devices That Actually Pay for Themselves
1. Smart Thermostat (Payback: 12 to 24 months)
The smart thermostat is the gold standard of smart home ROI. Not because of the scheduling — you can do that with any programmable thermostat. The savings come from geofencing (it turns down when you leave, up when you’re coming home), learning algorithms (Ecobee and Nest figure out your patterns and optimize around them), and remote control (you can turn it down from bed instead of walking to the hallway).
Realistic savings: 10 to 15 percent on heating and cooling, which translates to 100 to 200 dollars per year for most households. The Ecobee Premium costs around 250 dollars, so payback is 12 to 24 months. See our full breakdown in the Smart Thermostat ROI guide.
The catch: if you already use a programmable thermostat and set it properly, your savings will be smaller — maybe 5 to 8 percent. The thermostat pays for itself fastest for people who forget to adjust the temperature when they leave home.
2. Smart Plugs on High-Draw Devices (Payback: 6 to 18 months)
A smart plug on a space heater, window AC unit, or old chest freezer can pay for itself surprisingly fast. These devices draw significant power even in standby. A smart plug with energy monitoring (like the Kasa KP125M, around 15 dollars) lets you see exactly how much each device costs to run and set schedules to cut phantom power.
A space heater running 8 hours a day costs about 60 dollars per month. A smart plug that turns it off when you leave the house (geofencing) and on 30 minutes before you arrive saves about 20 dollars per month. The plug pays for itself in under a month. For more, see our Best Smart Plugs guide.
3. LED Bulbs with Smart Scheduling (Payback: 3 to 6 months)
This is the cheapest “smart” upgrade with the fastest payback. A 9-watt LED smart bulb replaces a 60-watt incandescent. If you run that bulb 8 hours a day, the energy savings alone is about 2 dollars per month per bulb. With scheduling (auto-off when you leave, dimming at night), you save another 50 cents to 1 dollar per month. A 10-dollar Wyze smart bulb pays for itself in 3 to 6 months.
The math gets even better if you’re replacing halogen or CFL bulbs. And scheduling means you never leave lights burning all day because someone forgot to turn them off.
4. Water Leak Detectors (Payback: Potentially immediate)
A water leak sensor costs 20 to 30 dollars. A single water damage claim costs an average of 11,000 dollars. If a leak detector catches one leak — ever — it has paid for itself hundreds of times over. This isn’t a “savings over time” device. It’s insurance.
Place them under your water heater, behind the washing machine, next to the toilet, and under the kitchen sink. Four sensors for under 100 dollars. See our full guide: Smart Water Leak Detectors: The 30-Dollar Device That Can Save You Thousands.
5. Smart Power Strips (Payback: 6 to 12 months)
Phantom power — the electricity your devices draw in standby mode — accounts for 5 to 10 percent of the average electricity bill. A smart power strip with auto-off (it cuts power to peripheral devices when the main device turns off) eliminates phantom draw from entertainment centers and home offices. At 30 to 40 dollars for a strip, and savings of 3 to 8 dollars per month, payback is under a year.
The Devices That Never Pay for Themselves
Smart Speakers
An Echo Dot costs 30 dollars. It saves you zero dollars. You’re paying for convenience, not ROI. That’s fine — smart speakers are great for controlling other devices, setting timers, and answering questions. But they don’t save you money. They make spending money easier (reordering products, ordering food), which is the opposite of ROI.
Smart Locks
A smart lock costs 150 to 250 dollars. It doesn’t save you money. It saves you the 30 seconds it takes to find your keys. That’s convenience, not financial return. Smart locks are worth it for convenience and security, but not for ROI.
Security Cameras
A security camera might save you money if it deters a break-in or provides evidence for an insurance claim. But that’s speculative. The subscription costs (3 to 10 dollars per month per camera) add up fast. Cameras are a security investment, not a financial one. For budget security, see our Smart Home Security on a Budget guide.
Robot Vacuums
A robot vacuum saves you time, not money. It’s a 300 to 800 dollar convenience purchase. Unless you were paying a cleaning service and the robot replaces that expense, it doesn’t pay for itself. (Though the time savings are real — see our robot vacuum guide.)
The Compound Effect: When Devices Work Together
The real savings come when devices work together. A smart thermostat saves 10 to 15 percent on its own. Add smart blinds that close automatically when the sun hits your windows, and you save another 5 to 10 percent on cooling. Add smart plugs that cut phantom power when you leave, and you save another 3 to 5 percent. Combined, these devices can reduce your energy bill by 20 to 30 percent — which is 300 to 600 dollars per year for most households.
The total cost for all three: about 400 dollars (thermostat 250, blinds motor 80, smart plugs 70). Payback in 8 to 16 months, and they keep saving money every year after that.
This is why smart home automations matter more than individual devices. One device saves a little. Several devices working together save a lot.
How to Calculate Your Own ROI
For any smart home device, the ROI math is simple:
- Calculate annual savings. Check your energy bill before and after installing the device. Most smart plugs with energy monitoring will tell you exactly how much each device costs to run.
- Subtract the purchase price. A 250-dollar thermostat that saves 15 dollars per month pays for itself in about 17 months.
- Factor in subscription costs. If the device requires a monthly subscription (security cameras, some thermostats), add that to the purchase price.
- Include intangible benefits. Convenience, security, and peace of mind have value too — just don’t count them as dollar savings.
The Bottom Line
The five devices that genuinely pay for themselves: smart thermostats, smart plugs on high-draw devices, LED smart bulbs, water leak detectors, and smart power strips. Everything else is a convenience purchase. That’s not a bad thing — convenience is worth paying for. But if you’re justifying a smart home on financial grounds, start with the devices that actually save money, and add the fun stuff later.