Energy savings calculator
Home automation energy savings calculator
How much you can save a year by automating climate, hot water and lighting, calculated with the same factors Spain’s Ministry uses for energy savings certificates.
The UNE-EN ISO 52120-1 standard classifies building automation into four classes, from D (no efficient control) to A (high efficiency), and gives each a consumption factor per service. Moving to a better class reduces consumption by the ratio between factors. This calculator applies the factors Spain’s MITECO includes in its energy savings certificate sheets.
Home automation energy savings calculator
Estimate how much you can save by automating heating, cooling, hot water and lighting, using the official UNE-EN ISO 52120-1 factors that Spain’s Ministry uses for energy savings certificates.
- Estimated annual savings
- Of the spend entered
- Payback
| Service | Spend | Savings | % |
|---|
Indicative estimate based on the UNE-EN ISO 52120-1:2022 efficiency factors included by Spain’s Ministry (MITECO) in CAE sheets RES040 and TER050. Actual savings depend on the building, equipment and use.
Where the figures come from
Spain’s Ministry for the Ecological Transition (MITECO) publishes standardised sheets to calculate savings from automation and control systems: RES040 for homes and TER050 for tertiary buildings. Their tables include the UNE-EN ISO 52120-1:2022 efficiency factors, with class C as the reference (factor 1).
Each service’s saving is current spend × 1 − (new class factor ÷ current class factor). For example, in a home, moving from class C to B for heating gives 1 − 0.88 ÷ 1 = 12 %.
| Building type | Service | D | C | B | A |
|---|---|---|---|---|---|
| Home | Heating | 1.09 | 1.00 | 0.88 | 0.81 |
| Home | Cooling | 1.09 | 1.00 | 0.88 | 0.81 |
| Home | Hot water | 1.11 | 1.00 | 0.90 | 0.80 |
| Offices | Heating | 1.44 | 1.00 | 0.79 | 0.70 |
| Offices | Cooling | 1.57 | 1.00 | 0.80 | 0.57 |
| Offices | Hot water | 1.11 | 1.00 | 0.90 | 0.80 |
| Offices | Lighting | 1.10 | 1.00 | 0.85 | 0.72 |
| Hotels | Heating | 1.17 | 1.00 | 0.85 | 0.61 |
| Hotels | Cooling | 1.76 | 1.00 | 0.79 | 0.76 |
| Hotels | Hot water | 1.11 | 1.00 | 0.90 | 0.80 |
| Hotels | Lighting | 1.10 | 1.00 | 0.88 | 0.76 |
| Restaurants | Heating | 1.21 | 1.00 | 0.76 | 0.69 |
| Restaurants | Cooling | 1.39 | 1.00 | 0.94 | 0.60 |
| Restaurants | Hot water | 1.11 | 1.00 | 0.90 | 0.80 |
| Restaurants | Lighting | 1.10 | 1.00 | 1.00 | 1.00 |
| Retail | Heating | 1.56 | 1.00 | 0.71 | 0.46 |
| Retail | Cooling | 1.59 | 1.00 | 0.85 | 0.55 |
| Retail | Hot water | 1.11 | 1.00 | 0.90 | 0.80 |
| Retail | Lighting | 1.10 | 1.00 | 1.00 | 1.00 |
| Schools | Heating | 1.20 | 1.00 | 0.88 | 0.80 |
| Schools | Cooling | 1.20 | 1.00 | 0.88 | 0.80 |
| Schools | Hot water | 1.11 | 1.00 | 0.90 | 0.80 |
| Schools | Lighting | 1.10 | 1.00 | 0.88 | 0.76 |
| Hospitals | Heating | 1.31 | 1.00 | 0.91 | 0.86 |
| Hospitals | Cooling | 1.31 | 1.00 | 0.91 | 0.86 |
| Hospitals | Hot water | 1.11 | 1.00 | 0.90 | 0.80 |
| Hospitals | Lighting | 1.20 | 1.00 | 1.00 | 1.00 |
Energy savings certificates (CAE)
Projects that bring a service to at least class B can certify their savings through Spain’s energy savings certificate scheme, with an energy performance certificate, invoices and the installer’s BAC class declaration. If it interests you, we assess it in the study.
Frequently asked questions
What does each class mean?
D: no efficient control. C: standard control, the reference. B: advanced control by zone, schedule and presence, with monitoring. A: high efficiency, demand and occupancy control with coordination between systems and continuous optimisation.
Why are there no lighting savings for homes?
The Ministry’s residential sheet only covers heating, cooling and hot water. Automating lighting also saves at home, but the standard gives no official factor for homes.
Are the savings guaranteed?
No. It is a standardised estimate; actual savings depend on the building, equipment and use. Measuring consumption before and after is recommended.
Related services
Home automation
Home automation installation in Valencia, start to finish: we bring lighting, climate, blinds, access and security together in one system you control from switches, touch panels and your phone, and hand it over programmed around the way you live.
View serviceWireless automation, no building work
We automate finished homes and premises in Valencia without chasing walls, without debris and without changing the décor: wireless devices that use the existing electrical installation and can be extended room by room.
View serviceShelly installation
We install the full Shelly range in Valencia to automate existing homes and businesses without building work: modules fit behind your current switches, in the consumer unit or in the blind box, and are controlled from the usual switch, your phone, a voice assistant or a home automation system.
View serviceContact
Shall we talk about your project?
Tell us what you need and what stage you are at. We will get back to you to arrange a site survey or a proposal.