Heat is one of the things a house does quietly until the day it stops. Keeping it running is less about heroics and more about routine: a known filter schedule, a service visit each year, and a clear answer to who owns the account. When those three are in place, a cold house becomes a small phone call instead of an emergency.
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Know the system she depends on
Find out what heats her home. It may be a furnace, a heat pump, a boiler, or a mix of systems. Find the model and serial numbers, the location of the thermostat, the filter size, and the location of the main shutoff for the fuel or electricity. Put this in one folder with the manuals and the warranty papers. Write the information on a single page so someone else can read it in the dark.
Set a filter calendar
Most heating systems need the filter checked on a regular schedule, and the manual or the service technician can tell you how often for your home. Pick a simple way to remember it, such as a monthly reminder on the phone of the person who lives closest. Keep spare filters where they are easy to reach. A dirty filter is one of the most common reasons a system works harder than it should.
Schedule the yearly service visit
Ask a heating company for a yearly service visit that covers the system's basic checks. Ask what the visit includes, whether it covers the thermostat, the vents, and the safety controls, and how they will note anything that needs follow-up. Ask them to send a written summary after each visit. Keep those summaries with the manuals.
Make the thermostat readable
Check that the thermostat is easy to read from her usual chair and that the settings are simple. If she or a helper adjusts it often, consider a model with large numbers and a clear mode button. Keep a note that says what the normal setting is and who to call if the house feels cold or the system sounds different.
Name who holds the account
Decide who is the named contact with the heating company, whose name is on the account and the service agreement, and who receives the invoices. If you are a renter, ask the landlord who is responsible for the system and how to report a problem. If you own the home, make sure at least two people know the company name, the account number, and the phone line for after-hours calls. A plan with one person who holds all of it is fragile when that person is away.
If you want help thinking through the rest of the house, the start here guide shows the order many families read in.