Figure 4
The horizontal axis lists months from “January” through “December”. The left vertical axis is labeled “Average electricity (kilowatt-hours per day)” and ranges from 0 to 7000 in increments of 1000 kilowatt-hours per day. The right vertical axis is labeled “kilograms of carbon dioxide equivalent per day”, and ranges from 0 to 4500 in increments of 500 kilograms of carbon dioxide equivalent per day. The stacked bars represent five components: “Space heating (gas)”, “H V A C (Electricity)”, “Lighting”, “Other uses”, and “Water heating (gas)”. Total energy use increases from about 3500 in January to a peak around 6600 to 6500 in July and August, then decreases to about 3600 in December. Space heating (gas) dominates summer months, rising sharply from about 500 in January to about 4000 in July and August, then falling to about 1000 in December. H V A C electricity contributes roughly 1200 to 1500 throughout the year, with slightly higher values in June through August. Lighting remains a smaller steady segment around 200 to 400. Other uses contribute about 700 to 1000 each month. Water heating (gas) remains the smallest segment near 100 to 200. The G H G emissions line stays between about 3300 and 3900 kilograms of carbon dioxide equivalent per day, peaking around May near 4000 and reaching the lowest level in December near 3000. Note: All numerical values are approximated.Monthly average daily energy use by end-use and GHG emissions. Source: Authors' own work