The bill arrives in the same envelope it always did, and somewhere in the house your father is probably holding it at arm's length and announcing that it is a robbery. Before you argue about the total, read the usage line. The usage line tells you what the house has been doing, and it does not care who is angry.
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What the usage line shows
Most utility bills show how much was used in the billing period, often with a small chart comparing it to the same month a year earlier or to the last several months. Find that chart first. A flat line means the house is using about the same amount each month. A sharp rise in one month means something changed in that month. The usual causes are a thermostat set higher or run for more hours, a water heater working harder, a toilet running through the night, or an appliance running that was not running before.
What drives the total up or down
Four things move most household bills, and you can check each one from the kitchen without climbing anything.
The thermostat is the big one in cold months. Ask him what temperature he keeps the house at when he is alone, and whether the heat runs all day with the rooms empty. Many people who spent decades heating a house for two never noticed that they were still heating it for two when only one of them was home. Write down the number on the thermostat and whether it is set to hold one temperature around the clock or to change with the day.
Hot water is the second. A water heater keeps heating whether anyone is showering or not. Before you lower the setting, check the label on the tank or the owner's manual, because some tanks have a range the maker recommends. Also notice how the laundry and dishes are run. Full loads run less often than small ones, and a half-empty machine running every day adds up.
A running toilet is the third, and it is the one most often missed. Listen in the evening when the house is quiet. If the tank keeps refilling on its own, water is leaking past the flapper, and the meter will show steady use overnight. The fix is often a small part, but this section is about the bill, so note the problem now and decide later who replaces the part.
The fourth is the appliances nobody thinks about: an old refrigerator with a worn door seal, a second refrigerator in the garage, a space heater left on in one room, a light left burning in the basement. These do not show up by name on the bill, but a daughter can walk the house once with a written list and tick off what is on and what is not.
Check the account before you pay
Look at whose name is on the account. If it still says your mother, the company may keep sending notices in her name, and some will not discuss the account with anyone else until the name is changed. Changing it usually takes one call and a copy of a document that shows the death. Ask the company exactly what they need before you start, so the call does not have to be made twice.
Next, ask whether the company offers a budget plan or an equal-payment plan. These spread the year's usage across twelve months so the winter bill does not arrive as a shock. Ask whether the plan carries any fee, and whether it is reviewed and adjusted at the end of the year. Compare the plan's estimate with his actual usage from the chart, not with what he remembers paying.
Check autopay too. Find out which bank account it draws from and which card, if any, is on file. If the account has changed or closed since the autopay was set up, the payment can bounce, and a late fee may follow before anyone notices. Find the due date and the payment source before you assume the bill is handled.
What to do tonight
Gather the last twelve months of bills, or as many as he has kept, and lay them out on the table in order. Look for the month that jumped and the month that dropped. Write a short note for each one in your own words: the month, the rough change in use, and what was happening in the house at the time. Do not argue about the total tonight. Ask him one question instead: what temperature does he keep the house at when he is home alone? Then listen to the answer without correcting it.
What to ask the utility
Ask the company to walk you through the usage chart, and ask whether they offer an energy review or a home visit. Ask what payment plans are available, whether there is a grace period before a late fee applies, and how to set up a payment reminder. Get the name of the person you spoke with and a direct phone line for next time, so you are not starting from the automated menu every month.
When to mention it to the doctor
If he says the house feels cold and he keeps the heat low, or if he tells you he is chilled all the time, mention that at his next doctor visit. A doctor should hear about it from the family, and it is worth bringing up whether or not the bill is high.