What smart home devices actually save you money on energy

Smart home technology cuts energy use by automating the systems that consume the most power in a house: heating, cooling, water heating, and lighting. A smart thermostat learns your schedule and adjusts temperature when you're away or asleep. Smart power strips cut phantom power drain from devices left plugged in. Smart lighting turns off rooms you've left empty. The savings come from behavior you don't have to think about — the system does it for you.

The devices that matter most are thermostats, water heaters, and lighting. A smart thermostat typically saves 10 to 15 percent on heating and cooling costs because it prevents you from heating or cooling an empty house. Smart water heaters let you set schedules so the tank isn't maintaining hot water at 3 a.m. Smart LED bulbs with motion sensors or scheduling eliminate the cost of lights left on in closets, basements, or garages. Everything else — smart plugs, smart appliances, smart meters — saves smaller amounts but adds up if you have many devices.

Key Takeaways

  • Smart thermostats and water heaters produce the largest energy savings because heating and cooling account for 40 to 50 percent of home energy use.
  • Most smart devices work through a smartphone app or voice command, but they save money only if you actually use the scheduling and automation features.
  • Installation costs vary widely: a smart thermostat runs $200 to $400 installed, while smart bulbs cost $10 to $25 each and require no installation.
  • Some utility companies and state energy programs offer rebates or partial payment for smart thermostats and water heaters, which can cut your upfront cost by 25 to 50 percent.
  • Smart devices work best in homes where you have inconsistent schedules or forget to adjust temperature and lights — they save less if you already manage energy carefully.

Smart thermostats: how they work and what they cost

A smart thermostat learns your temperature preferences and your schedule, then adjusts heating and cooling automatically. You set it once through an app or voice command, and it remembers when you leave for work, when you come home, and when you sleep. If you leave early or stay out late, many models detect that your phone has left the house and adjust the temperature without you doing anything. Some models also sense whether anyone is home by detecting motion or checking your location.

Installation costs between $200 and $400 for the device plus labor, though some people install them themselves if they're comfortable with basic wiring. The thermostat itself costs $100 to $300 depending on features. You'll need a C-wire (common wire) running from your furnace or air handler to your thermostat — if you don't have one, installation costs more. Before buying, check whether your heating system is compatible; most gas furnaces and heat pumps work, but some older systems or electric baseboard heaters do not.

Many utility companies and state energy programs cover 25 to 50 percent of the cost through rebates. Contact your utility directly or search your state's energy office website for current programs. Some programs require you to buy a specific brand or model, so check before purchasing. Rebates typically arrive as a check or bill credit 4 to 8 weeks after you submit proof of purchase and installation.

Smart water heaters and heat pump water heaters

A smart water heater lets you schedule when the tank heats water, so it's not maintaining 120 degrees all night when nobody is showering. You can also lower the temperature setting remotely if you're away for a week. Some models send alerts if the tank is leaking or failing. The savings are smaller than a smart thermostat — typically 5 to 10 percent of your water heating bill — but water heating is usually 15 to 20 percent of total home energy use, so the dollar amount still matters.

A heat pump water heater is different: it moves heat from the air into the water instead of generating heat directly, using 50 to 60 percent less energy than a traditional electric water heater. Heat pump models cost $1,200 to $2,500 installed, compared to $800 to $1,500 for a traditional electric tank. They work best in climates where the air temperature stays above 50 degrees most of the year; in very cold climates they're less efficient. Many states and utilities offer rebates of $500 to $1,500 for heat pump water heaters because the energy savings are large enough to matter at a grid level.

If you rent, you cannot install either type without landlord permission. Some landlords will split the cost or cover it entirely if you show them the utility savings projection, especially if the current water heater is old.

Smart lighting and motion sensors

Smart LED bulbs use 75 percent less energy than incandescent bulbs and last 15 to 25 years instead of 1 to 2 years. A smart bulb costs $10 to $25 per bulb and screws into any standard socket — no installation required. You control them through an app or voice command, or you can set schedules so they turn off automatically at a certain time. Some models dim gradually in the evening to reduce blue light before bed.

Motion sensors are the real energy saver for smart lighting. A sensor turns lights on when it detects movement and off after 5 to 15 minutes of no motion. They work best in rooms you pass through briefly — bathrooms, closets, garages, basements — where lights often stay on accidentally. A motion sensor bulb or fixture costs $20 to $60 and saves the most energy in homes where people frequently forget to turn off lights. In a house where lights are already managed carefully, the savings are minimal.

Smart power strips work similarly: they cut power to devices plugged into them when they detect no activity. A smart strip costs $15 to $40 and works well for entertainment centers, computer setups, or kitchen appliances that draw power even when off. The savings are usually $5 to $15 per month per strip, depending on what's plugged in.

How to choose devices that actually fit your home

Start with the systems that use the most energy in your home. Heating and cooling account for 40 to 50 percent of energy use in most climates, so a smart thermostat is the first choice. Water heating is 15 to 20 percent, so a smart water heater or heat pump is second. Lighting is 10 to 15 percent, but the savings from smart bulbs are smaller unless you have many lights left on regularly. Appliances and plug loads are the rest.

Consider your household's actual behavior. Smart devices save the most money in homes where people have irregular schedules, forget to adjust temperature, or leave lights on frequently. If you already manage temperature and lights carefully, the savings will be smaller. If you have a very consistent schedule, you might save more money by straightforward programming a basic (non-smart) thermostat once and leaving it alone.

Check compatibility before buying. Smart devices need either WiFi or a hub (a small device that connects to your router). Some brands use their own hub, others use standard protocols like Zigbee or Z-Wave. If you already own smart home devices, check whether new devices work with the same system. Mixing incompatible brands means managing multiple apps.

Rebates and incentive programs for smart devices

Most utility companies offer rebates for smart thermostats, and many offer rebates for heat pump water heaters. The amount varies by utility and state — some cover 25 percent of cost, others cover 50 percent or more. A few utilities offer rebates for smart power strips or LED bulbs, but these are less common.

To find programs in your area, contact your electric and gas utility directly and ask about smart thermostat or water heater rebates. You can also search your state's energy office website (usually under the state's environmental or energy department). The Database of State Incentives for Renewables and Efficiency (DSIRE) lists programs by state, though the interface is technical.

Most rebate programs require you to submit a receipt and proof of installation within 30 to 90 days of purchase. Some require the device to be installed by a licensed contractor; others allow DIY installation. A few programs require you to buy from a specific retailer or installer. Read the rebate terms before you buy, because buying the wrong model or installer can disqualify you.

Installation: what you can do yourself and what requires a professional

Smart bulbs and smart power strips require no installation — you screw in the bulb or plug in the strip. Smart thermostats require basic wiring knowledge or a professional. If your current thermostat has four or more wires connected to it, you can likely install a smart thermostat yourself by taking a photo of the wires before disconnecting them, then matching them to the new thermostat's instructions. If you have only two wires or you're unsure, hire a technician — a bad connection can damage the thermostat or your heating system.

Water heater installation should be done by a licensed plumber because it involves gas or electrical connections and water lines. Heat pump water heater installation is more complex and almost always requires a professional. Smart water heater controls that attach to an existing tank can sometimes be installed by a handy homeowner, but check the manufacturer's instructions first.

If you rent, you cannot install a thermostat or water heater without written permission from your landlord. Smart bulbs and power strips are fine because they're removable. Some landlords will install a smart thermostat if you ask and explain the energy savings, especially if the current system is old or inefficient.

Frequently Asked Questions

Do smart devices work if my internet goes out?

Most smart devices stop responding to app commands if your WiFi is down, but they keep running on their last setting. A smart thermostat will maintain whatever temperature you set it to. A smart bulb will stay on or off depending on its state when the internet failed. Scheduling features won't work until the internet comes back. Devices with a local hub (like some smart home systems) work better during outages because they don't need to reach the internet for basic functions.

Can I use smart devices if I rent?

Smart bulbs and power strips are fine — they're removable and you can take them with you. Smart thermostats and water heaters require landlord permission because they're permanent installations. Some landlords will approve a smart thermostat if you show them the energy savings and promise to remove it when you move. Always ask in writing and keep the original thermostat so you can reinstall it before you leave.

How much money will I actually save?

A smart thermostat typically saves $10 to $20 per month depending on your climate and current heating costs. A heat pump water heater saves $15 to $30 per month. Smart lighting saves $5 to $15 per month if you have many lights or forget to turn them off. Total savings depend on your current energy use and local utility rates. Your utility company can estimate savings based on your address and current usage.

What if my smart device stops working?

Most smart devices have a warranty of one to three years. If a device fails, contact the manufacturer for a replacement. During the warranty period, replacement is usually free. After the warranty expires, you pay for a new device. Smart thermostats and water heaters are more durable than smart bulbs, which can fail after 5 to 10 years of use even though they're rated for longer.

Do I need a hub to use smart devices?

Some devices connect directly to your WiFi and don't need a hub. Others require a hub — a small device that plugs into your router and communicates with the smart devices. If you're buying multiple devices from the same brand, check whether they all use the same hub or if each device needs its own. Using one hub for many devices is simpler than managing multiple hubs.