Smart home kit under $500: thermostat, lock, doorbell, lights
Updated
A hub, a smart thermostat, a retrofit lock, a video doorbell, bulbs and leak sensors for under $500, with what to check on your wiring, your door and your lease first.
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Before you buy
This is the first kit that touches your home’s hardware. The spending is concentrated on the thermostat, the lock and the doorbell, so the order in which you check things matters.
Check these before ordering
- Thermostat wiring. Turn off power to the HVAC system at the breaker, remove the old faceplate, photograph the wires and read the terminal letters rather than colors. If the thermostat is marked 120 V or 240 V, it is line voltage and needs a different model: the Department of Energy notes that electric baseboard systems need thermostats that directly control 120- or 240-volt circuits. If there is no C wire, see our C-wire guide.
- Door. Single-cylinder deadbolt, thickness, backset and room around the thumbturn. See smart lock for renters.
- Doorbell transformer. A wired video doorbell needs enough voltage (often 16–24 VAC). Measure with a multimeter or read the transformer label before you buy. If not, choose a battery model.
- Permission. Renters need written approval for the thermostat swap, the lock and a doorbell on the door or frame.
Why a thermostat is the main purchase
ENERGY STAR’s technical bulletin puts the average saving for certified smart thermostats at about 8 percent of heating and cooling cost, or roughly $50 per year, and the Department of Energy says setting a thermostat back 7° to 10°F for eight hours a day can reduce costs by up to about 10 percent a year. Savings depend on your climate, your house and your habits; a thermostat does not save money if it is left on hold.
Safety
Never work on live wiring. Turn power off at the breaker and confirm with a tester. Hire a licensed electrician or HVAC technician if you are unsure, and follow local code. Do not install a lock that would keep anyone from getting out in an emergency: interior thumbturns or keyless exit should remain.
Security for locks and cameras
The FTC advice is the same for every device: a unique password, two-factor authentication on the account, automatic updates, and removing access for people who no longer need it.
Core items
Smart speaker or display (hub)
$30–$50The controller and voice for the rest of the kit; Thread-capable models can also connect Thread locks and sensors.
What to look for: Matter controller support in the vendor’s list, Thread border router if you plan to buy Thread devices, a microphone switch
See options on AmazonSmart thermostat (24 V)
$80–$125The savings device. ENERGY STAR certified smart thermostats save an average of about 8 percent on heating and cooling costs, roughly $50 a year, so it can recoup part of its cost.
What to look for: ENERGY STAR certification, C-wire or power adapter option, works with your HVAC type (heat pump, dual fuel, 24 V only), your ecosystem
See options on AmazonRetrofit or keypad smart lock
$100–$150Keyless entry, guest codes and a “door locked” status. A retrofit lock keeps your existing key and the landlord’s access.
What to look for: fits your deadbolt and door thickness, auto-lock, keypad or key backup, battery alerts, Matter over Thread or your ecosystem
See options on AmazonVideo doorbell
$50–$90Answers the door from anywhere and records visitors. Choose wired if you have a working doorbell transformer, battery if you do not.
What to look for: your transformer’s voltage if wired, local storage or a clear subscription list, a field of view that includes packages, your ecosystem
See options on AmazonSmart bulbs (E26, white or tunable) × 3
$8–$12Core lighting scenes in the room you use most.
What to look for: dimmable, tunable white, Matter or your ecosystem’s logo
See options on AmazonWater leak sensors × 2
$10–$16Water heater and kitchen sink or washer: the two places with the highest chance of an expensive leak.
What to look for: siren, one-year-plus battery, ecosystem support
See options on AmazonNice to have
Smart plugs × 2
$10–$13Lamps and a fan, plus the router power cycle.
What to look for: Matter or ecosystem logo, a rating that matches the load
See options on AmazonWindow or portable AC controller
$25–$70For apartments without central air: adds schedules and remote control to a unit that has a remote.
What to look for: infrared or compatible controls for your model, temperature sensor, your ecosystem
See options on AmazonDoor and window sensors × 2
$12–$18Entry door and back door status, a light trigger and an alert.
What to look for: your ecosystem or Matter, replaceable battery
See options on AmazonStep by step
- Verify wiring, door size and doorbell transformer, and get written approval if you rent.
- Set up the hub and create your home; add all adults.
- Install the thermostat with power off at the breaker; follow the maker’s wiring guide and test heating and cooling before you leave.
- Install the lock with the door open; test key, keypad and thumbturn before closing it. Set auto-lock to a short delay.
- Install the doorbell; if wired, power off at the breaker first. Adjust the angle to include packages.
- Add the bulbs and leak sensors; create a “Leaving” routine that lowers the thermostat and checks the lock.
- Give each adult a lock code of their own; remove it when no longer needed.
Cheaper or upgraded versions
Cheaper, about $300–$350: skip the lock and the thermostat; keep the hub, doorbell, bulbs and leak sensors. Add the thermostat when you know your wiring.
Stronger, about $600–$700: add a second doorbell or camera, door sensors and a mini-split or AC controller. For a whole house, see the under $1,000 kit, or start smaller with the under $300 kit.
Frequently asked questions
Is a smart thermostat worth it?
It can be. ENERGY STAR reports average savings of about 8 percent on heating and cooling, roughly $50 a year. The benefit depends on your climate and schedule, and you need compatible wiring.
Can I install the thermostat, lock and doorbell myself?
Most people can, with the power off at the breaker. If you are unsure about wiring, hire a licensed electrician or HVAC technician and follow local code.
Do renters need permission?
Usually yes for a thermostat, a lock and a doorbell mounted on the door or frame. Ask in writing, and keep the original parts to restore at move-out.
Wired or battery doorbell?
Wired if your transformer matches the doorbell’s requirement and the existing wiring is in good condition. Battery if you have no wiring or cannot change it.
Sources
- ENERGY STAR — Technical bulletin: ENERGY STAR certified smart thermostats
- U.S. Department of Energy, Energy Saver — Thermostats
- Federal Trade Commission — Securing your internet-connected devices at home
- Federal Trade Commission — Using IP cameras safely
- U.S. EPA WaterSense — Fix a Leak Week
- HUD and DOJ — Joint statement: Reasonable modifications under the Fair Housing Act (2008)