The smart-home industry has done a remarkable marketing job: convincing people that energy management requires an ecosystem of connected devices, an app for each one, and substantial upfront investment. The truth is that almost all the energy-saving benefits of smart homes come from a small number of behaviours that you can implement without buying a single new device.
Here are the habits that deliver the smart-home benefit without the smart-home cost.
Schedule your heating
The single largest smart-home claim is “your heating learns when you’re home.” The actual benefit is heating that runs only when needed. You can achieve this with a basic programmable thermostat, which most modern flats already have.
The habit: spend 15 minutes setting your heating schedule once. Heat for 30 minutes before you wake. Drop to 16°C when you leave for work. Heat for 30 minutes before you arrive home. Hold at 19-20°C in the evening. Drop to 16-17°C overnight.
This schedule, manually set on a basic thermostat, captures roughly 90 percent of the benefit of a smart thermostat at zero cost.
Run laundry and dishwasher at night
Many smart-home systems claim to “shift load to off-peak hours” for cost savings. You can do this manually by simply running your washing machine and dishwasher at night or early morning when electricity prices are lower (if you’re on a time-of-use tariff).
Most modern appliances have delay-start functions, load the machine in the evening, set delay-start for 2am, the cycle runs at off-peak rates. Same effect as a smart system, no devices needed.
Turn things off properly
Smart plugs that automatically turn off devices when not in use are useful but unnecessary. A regular plug strip with a switch achieves the same thing manually.
The habit: identify devices with significant standby loads (TVs, set-top boxes, gaming consoles, computer setups, kitchen appliances). Plug them into a switched plug strip. Hit the switch when not in use.
The standby savings can be 5-10 percent of total household electricity for plug-strip-discipline households.
Heat occupied rooms only
Smart radiator valves promise to heat only occupied rooms. Most flats already have thermostatic radiator valves (TRVs) that achieve this manually.
The habit: turn TRVs down in unused rooms. Spare bedroom, hallway, dining room if you’re not using it. Heat the rooms you’re in; let the others stay cooler. The energy savings are substantial, sometimes 20-30 percent of heating use.
Use natural light
Smart lighting systems promise to optimise illumination automatically. Manual optimisation works almost as well: open blinds during daylight, position your workspace near a window, only turn on lights when needed.
The habit: be intentional about lighting. Don’t leave lights on in empty rooms. Use task lighting (a desk lamp) rather than overhead lighting when only one area needs to be lit. The savings are modest but easy.
Open windows strategically
Smart ventilation systems promise to manage indoor air quality automatically. Manual ventilation works almost as well in apartments.
The habit: open windows for 15 minutes every morning, especially after sleeping. This flushes stale air, reduces humidity (preventing mould), and improves indoor air quality. Close windows when you leave for work. Don’t leave windows open all day in winter, heat is escaping.
Track your usage manually
Smart home apps show you real-time energy data. You can get similar awareness by checking your bills monthly and noting unusual changes.
The habit: read your bill each month. Compare to the same month last year. If consumption is higher, investigate (new device? heating settings? a leak?). This monthly check catches drift before it becomes expensive and identifies high-impact interventions.
Use timers
Smart plugs let you schedule devices remotely. Simple mechanical or digital plug-in timers achieve the same scheduling at a tenth of the price.
Useful applications: turning lights on at dusk and off at midnight (a £5 timer). Switching off chargers and small appliances overnight. Scheduling the kettle to boil at 6:45am for your morning coffee. Each timer is £5-15; same functionality as a £25-40 smart plug.
The cooking pattern
Smart ovens promise to optimise cooking energy. Old-fashioned cooking discipline does the same:
- Plan to cook multiple things in one oven session (a meal plus next-day lunches).
- Use lids on pots to retain heat.
- Match pot size to hob ring.
- Use the right tool: kettle for boiling water, microwave for reheating, oven only for things that really need it.
- Turn off oven and hob a few minutes before the food is fully done; residual heat finishes the cooking.
When smart-home tech is genuinely worth it
Some smart-home tech does deliver beyond what manual systems can. The cases:
- Smart thermostats for landlords/property managers managing multiple properties remotely.
- Smart radiator valves in homes with very irregular schedules where manual TRV adjustments are too frequent.
- Smart plug strips for households with major standby load issues that won’t reliably remember to flick switches.
- Smart-home hubs for accessibility where physical interaction with switches is genuinely difficult.
For most households, these cases don’t apply.
Related: Which Energy-Efficient Appliances Are Actually Worth the Upgrade?
The hidden cost of smart homes
Beyond purchase price, smart-home devices have ongoing costs:
- The standby power consumption of always-on devices (sometimes higher than the energy they save).
- Software subscriptions for advanced features.
- Compatibility issues between platforms and brands.
- Devices that stop working when manufacturers discontinue services.
- Security vulnerabilities and privacy concerns.
- Eventual e-waste when devices fail or become obsolete.
These hidden costs often eliminate the energy savings the devices promise.
Related: Phantom Load: The Standby Electricity Bill You Didn’t Know You Were Paying
The honest comparison
A household that implements the manual habits in this article will achieve roughly 80-90 percent of the energy savings of a fully-equipped smart home, at zero additional cost and with none of the ongoing complications.
The biggest energy savings come from heating discipline, full appliance loads, eliminating standby waste, and shorter showers. None of these require connected devices. They require habits, which are free, durable, and not vulnerable to firmware updates or platform shutdowns.
Related: Cutting Your Energy Bill: The Renter-Friendly Playbook
The one purchase that does pay back
If you’re going to buy one piece of “smart” energy kit, make it a smart meter (in-home display). Most utility suppliers install these for free. They show real-time consumption, which makes wasteful behaviours visible. Most users reduce consumption by 5-10 percent purely from increased awareness.
Beyond that, the smart-home category is largely solutions in search of problems for the average household. The manual habits achieve almost the same outcome with none of the downsides.
The energy math in one table
| Section | What the article covers |
|---|---|
| Schedule your heating | The single largest smart-home claim is "your heating learns when you’re home." The actual benefit is heating that runs only when needed. |
| Run laundry and dishwasher at night | Many smart-home systems claim to "shift load to off-peak hours" for cost savings. |
| Turn things off properly | Smart plugs that automatically turn off devices when not in use are useful but unnecessary. |
| Heat occupied rooms only | Smart radiator valves promise to heat only occupied rooms. |
| Use natural light | Smart lighting systems promise to optimise illumination automatically. |
Sources and further reading
Frequently asked questions
A single smart plug on your main entertainment cluster (TV, streaming box, console) with an evening auto-off schedule. Costs under £15, needs no landlord permission, cuts standby draw the day you install it, and gives you a week of data to decide whether the rest of the ecosystem is worth expanding into. Everything else, plugs on kitchen appliances, motion-based lighting, hub-based automation, should be judged against what that one plug actually saved.
For some devices yes, particularly always-on hubs and bridges. A smart-home setup with 10 connected devices can use more standby power than the standby power it claims to save elsewhere.
Setting a heating schedule with cooler temperatures when away or asleep. Captures most of the smart-thermostat benefit at zero cost.
Only if you wouldn't reliably flip a manual switch. A regular plug strip with a switch costs £5 and provides 90 percent of the same benefit.
