Most of the time the meter will fail in your favor. It is however
possible that it was calibrated incorrectly, or was fiddled with by someone.
Your meter is a device that is certified for use in trade, and there should
be some government agency in your jurisdiction that has authority to ensure
it's performance. Every meter here has the back sealed by the government.
Our electric water heater is our #1 power user. Check for hot water
leaks, dripping taps, etc. It takes a lot of energy to heat water.
Other things to watch out for are baseboard heaters, malfunctioning
refrigerators, etc. A older furnace with less efficient motors could use
more power. Sometimes people will put baseboard heaters to compensate in
colder rooms, if the thermostat is cranked up for it then it might end up
running all the time (with the heat being carried to the rest of the house).
This would be expensive.
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