Vol. iv · No. 11
Tuesday, 12 November 2024
Account № 4471-08 · 124 Linden St.

The Household Energy Review

An annual audit of consumption, conducted in the manner of Edward Tufte — small multiples, sourced numbers, no chart junk.
I. Annual Narrative II. Five End-Uses III. Recommendations, Ranked IV. The Thermostat V. Sources
I. Annual Narrative

Fourteen thousand two hundred kilowatt-hours, and where they went.

Your household consumed 14,217 kWh over the trailing twelve months, peaking sharply in January and dipping to its quietest hum in early June. Heating accounted for forty-one percent of the year's burn, cooling another eleven, and a long tail of appliances and standby loads absorbed the remainder. At your blended supply rate of $0.2814 / kWh,3 the year cost $4,002 — roughly $334 a month, though February alone took $612.

The figures that follow are not estimates of the house in the abstract; they are this house, measured. Where a number is modeled rather than metered, it is marked so. Where a recommendation appears, its assumed savings are footnoted to the study that produced them.

Whole-house electricity, kWh / month · Dec 2023 – Nov 2024
peak 1,842 · trough 612 · mean 1,185
median 1,185 1,842 · Jan 612 · Jun DJF MAM JJA SON ·
14,217
kWh consumed, trailing 12 mo.
+8.2% vs. prior year4
$4,002
paid to utility, same period
blended $0.2814 / kWh3
$1,209
recoverable, per audit below
30.2% of annual bill
II. The Five End-Uses
each panel: kWh / month, Dec → Nov, common vertical scale 0–800

Where the kilowatt-hours actually go.

A note on scale: all five panels share a common vertical range so that a glance compares them honestly. Heating's January spike is roughly six times cooling's July peak — that proportion is the audit's central fact.
III. Recommendations, Ranked

Eight actions, sorted by recoverable kilowatt-hours.

# Action kWh / yr $ / yr saved Up-front Payback
1 Air-seal & insulate attic to R-497
current R-19 batts, gaps at chases
1,640 $462 $2,100 54 mo.
2 Set heat-pump lockout to 25 °F8
prevents resistance strip from cycling above setpoint
980 $276 $0 immediate
3 Heat-pump water heater, 50 gal6
replaces 2017 resistance tank in basement
820 $231 $1,650 net 86 mo.
4 Night setback 68 → 62 °F, 11 p.m.–6 a.m.8 412 $116 $0 immediate
5 Replace remaining 14 incandescents with LED9 218 $61 $42 8 mo.
6 Dryer vent cleaning & sensor calibration 96 $27 $110 49 mo.
7 Smart-plug standby loads (entertainment cabinet)10 61 $17 $36 26 mo.
8 Refrigerator coil cleaning & gasket reseat 68 $19 $0 immediate
Total, if all eight adopted 4,295 $1,209 $3,938 ≈ 39 mo. blended
IV. The Thermostat

A control, not a dashboard.

The house is currently calling for heat. The indoor sensor in the front hallway reads 67°; the target is 68°. At the current outdoor temperature of 31°, the heat pump is operating at COP 2.412 and the resistance backup is idle.

Connected device: Ecobee SmartThermostat Premium, paired 14 Mar 2024. Last sync 38 seconds ago. Schedule: weekday occupied 06:00–08:30 and 17:00–22:30.
Today, runtime
4h 12m
Today, kWh
14.8
Today, cost
$4.17
55° 60° 65° 70° 75° 80° target 68° now 67° 68 °
heating · stage 1 of 2
step 1°
Every degree lowered between 60–70 °F in winter reduces heating consumption ~3%.8