Quick answerHome automation saves electricity by eliminating unnecessary consumption and shifting the rest to cheaper hours: heating or cooling only occupied rooms and switching off when a window opens, cutting standby loads, lighting only when someone is present, running the water heater, dishwasher or EV charging in cheap periods, and sharing out power so you don’t need a bigger supply. Measuring consumption is the first step.
Home automation doesn’t work miracles on your bill, but it systematically tackles the consumption nobody switches off and the consumption that happens at the most expensive time of day. The key is knowing where your home’s energy goes before you automate.
First, measure
An energy meter in the consumer unit (for the whole house and, ideally, the main circuits) answers basic questions: how much the house uses overnight, what happens when the air conditioning starts, how much the water heater costs. Without this data, any savings figure is guesswork.
Where the savings are
1. Heating and cooling
Usually the largest controllable load in a home.
- Zoned climate control — only rooms that are occupied.
- Schedules and away mode: setback when nobody is home.
- Window contacts: switch off the room’s climate when a window opens.
- Blinds that close on sunny façades in summer.
More in controlling heating and air conditioning from your phone and motorised blinds.
2. Standby loads
TVs, sound systems, consoles, set-top boxes and chargers add up to a constant draw. A circuit or socket that switches off when you leave or overnight eliminates it.
3. Lighting
Presence sensors in hallways, bathrooms and the garage; dimming according to daylight; an all-off button when you leave. See smart lighting.
4. Shifting loads to cheaper hours
With time-of-use or hourly pricing, moving flexible loads reduces cost even if consumption stays the same:
| Load | What gets automated |
|---|---|
| Electric water heater | Heat in the cheap period, keep only what’s needed |
| Dishwasher and washing machine | Delayed start in cheap hours (if the appliance allows) |
| Electric car | Scheduled charging, or charging by hourly price |
| Heat-pump water heater | Run in cheap or solar hours |
| Pool pump | Schedule aligned with the tariff |
5. Load management
When several appliances coincide, the main limiter can trip. Automation can delay or pause loads (water heater, EV charging) as total consumption approaches the contracted power — often avoiding the need to upgrade it.
6. Solar self-consumption
With solar panels, using what you produce instead of exporting it is the most profitable approach. See home automation and solar panels.
Worked example: a home with a heat pump and an electric car
- Whole-house and per-circuit metering in the consumer unit.
- Three-zone climate control with schedules and window contacts.
- Water heater scheduled for the cheapest period.
- EV charging capped to stay within contracted power and prioritised overnight.
- Living-room standby loads cut on “Leave” and overnight.
- A monthly consumption report in the app to check the effect of each change.
Common mistakes
- Automating without measuring, so you never know if it worked.
- Hard-coding tariff schedules and forgetting them when conditions change.
- Cutting power to things that must stay on (router, alarm, fridge).
- Presence sensors that switch off with people in the room.
- Expecting big savings in a home that already uses very little.
Conclusion
Savings with home automation come from avoiding wasted consumption, heating and cooling sensibly and shifting flexible loads to cheaper hours — without giving up comfort. Measure first, automate what weighs most, and review the results. Equipment and tariffs change, so the programming should too.
Domolife designs home automation focused on energy management. Let’s review your home.
Frequently asked questions
How much can I save?
It depends on how the home is used today, the climate, the equipment and the tariff. That’s why you measure before and after — an energy meter shows what really changes. Be wary of generic percentages.
Can it help with time-of-use pricing?
Yes. With a time-of-use or variable-price tariff (such as Spain’s PVPC), automation can schedule flexible loads — water heater, dishwasher, EV charging — into the cheapest periods automatically.
What is load management?
Delaying or sharing loads when total consumption approaches your contracted power, avoiding trips and often allowing a lower contracted power.
Do the automation devices use much electricity themselves?
They have a small, constant draw. In a sensible design it’s far lower than the consumption they avoid, but it should be accounted for.
Sources and technical documentation
- Red Eléctrica — PVPC prices (esios)
- IDAE — energy saving and efficiency (Spanish)
- CNMC — Spanish markets and competition regulator
Features depend on the exact model and firmware: always check the manufacturer’s datasheet before buying.