Home energy monitoring systems and what they measure

What types of home energy monitor are there?

• Utility smart meter data. No hardware to buy, but you see whole-house use, often after a delay. See smart meter energy tracking.
• Panel-mounted monitors. Sensors clamp around the main feed or individual breakers inside the electrical panel and report in near real time. Panel work should be done by a licensed electrician.
• Plug-in meters. A small adapter between an appliance and the outlet gives that device's use. Cheap and safe for fridges, computers and space heaters.
• Smart thermostats. They log run time and temperature, which tells you how hard the heating works. See smart thermostat savings.
• Solar inverter monitoring. A home with panels already has production data, covered in solar system monitoring.

Prices vary widely by brand, features and region, so compare current offers rather than relying on a quoted range.

What should you measure?

Energy in kilowatt-hours shows how much was used over a period, and power in kilowatts shows how much is being drawn right now. Both are useful. A device drawing 1.5 kW for two hours uses 3 kWh. The figures that matter most for most households are these.

• The overnight baseline when nobody is using much, which shows standby loads.
• Peaks from heating, cooking, laundry and water heating.
• Heating or cooling runtime on cold days compared with outdoor temperature.
• Production and export for homes with solar.

Compare days with similar weather, otherwise the weather swamps everything else. Gas and other fuels need their own meter reading, taken at the same time each week, if the monitor does not cover them.

What can monitoring actually save?

Results depend on the household. Studies of feedback on energy use report modest average reductions, and some households see little change once the novelty fades. The largest savings come when the data leads to a concrete action, for instance finding an old second freezer running all year, lowering a water heater setpoint or fixing a heating schedule.

Treat savings claims on product pages with caution. The honest test is your own before and after data, at similar weather, over a few weeks. If heating dominates the winter, an assessment of the building shell will do more than any display, as set out in home energy audits, and the day-to-day steps are in how to lower your heating bill in winter.

What should you check before buying a system?

• Does it work with your panel, your meter and your province's electricity setup?
• Does it need a cloud account, and what happens to the data if the company closes?
• Who can see the data, and can you delete it?
• Is the installation within what a homeowner may legally do, or does it need an electrician?
• Does it integrate with the thermostat or solar system you already have?

Local data storage and open formats keep options open. Ask the utility whether it offers a free portal or an in-home display before spending money.

How was Drake Landing monitored?

Monitoring was central to Drake Landing Solar Community in Okotoks, Alberta. Heat flows through the Energy Centre, the storage tanks, the borehole field and the district loop were logged, and the community's reported solar share of 97 percent by 2012 and 100 percent in the 2015-16 heating season came from that data. The results are summarized on the performance results page, and the system layout is on the Energy Centre page.

The principle carries down to a single house: you cannot manage what you do not measure, and the measurement has to be at the point where the energy is used. The community was wound down from about 2020. For a house-scale view of heat storage, see solar fraction explained.

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