Be the Name on the Refrigerator When the Furnace Quits

Here is the arithmetic every HVAC, plumbing and roofing company lives inside, whether anybody in the office has written it down or not.

The big job comes around rarely. The homeowner does not stay forever. And when the big job does come, it comes as an emergency, on a cold night, to whoever they think of first.

How rarely the big job comes

The International Association of Certified Home Inspectors publishes a life-expectancy chart for home systems. It puts a furnace at 15 to 25 years, a heat pump at 10 to 15, a central air conditioner at 7 to 15 and a conventional water heater at 6 to 12. Architectural asphalt shingles run about 30 years. InterNACHI is careful to say the figures are guidelines, not guarantees, and the Department of Energy puts a storage water heater at 10 to 15 years.

ENERGY STAR's advice is to start thinking about replacement when a furnace or boiler passes 15 years, or a heat pump or air conditioner passes 10. Those are not lifespans. They are the point where a homeowner starts listening for the noise.

How long the homeowner stays

The National Association of Realtors' 2025 Profile of Home Buyers and Sellers found that sellers had lived in their homes a median of 11 years, an all-time high.

Put the two together. A homeowner who stays the median eleven years with a furnace that lasts fifteen to twenty-five may replace it once while they own the house, or not at all. You might get one shot at the biggest ticket in your business per customer, ever. Everything between now and then is a tune-up, a clogged drain and an invoice.

Who they call when it breaks

In August 2024, Clear Seas Research and The ACHR News asked homeowners how they choose an HVAC contractor. 73% said they would contact the same company they had used before, up from 29% when the same question was asked a year earlier.

I would not lean on that one hard. The jump is enormous, Clear Seas is the research unit of the magazine's own publisher, no sample size is published, and homeowners could choose more than one answer. Take it as a direction rather than a measurement — but it is the direction every trade already suspects. When something breaks, the call goes to whoever is already in mind.

This card goes on the refrigerator

A card from an accountant or an attorney goes up on an office wall. Yours is different. A card from your company lands on a kitchen counter and ends up on the refrigerator door or the corkboard by the back door, which is exactly where somebody is standing when the water heater starts making a noise.

The magnet your tech left on the fridge three years ago has been covered by a pizza place. A card gets kept because a person signed it.

How to do it

Mail the whole customer file. A service company that has been around ten years can easily have thousands of households in its records, every one of them a customer who let you into their home and was satisfied enough not to call anyone else. That list is the asset. Plenty of trades only ever touch it with an invoice and a service reminder.

Sign it with the name they remember. Homeowners do not remember companies. They remember the tech who came out on a Sunday, or the crew that put down drop cloths without being asked. Imprint the company and the owner's name, and if you are small enough, have your techs sign a stack for their own customers.

Do not put a coupon in it. A coupon makes it the same as every other mailer on the counter, and it goes where they go. The card is worth more for being the one thing from you that is not selling a tune-up.

Hand off the addressing if the list is big. A few thousand envelopes is not an afternoon. We address them for $75 per 100, and the cards come back to you with the envelopes done, so your techs can still sign them. The full mailing service, $350 per 100 with postage included, sends the cards straight out, so save it for the part of the list nobody is going to sign. How to split a list between the two is in Should We Address and Mail Your Holiday Cards?

The short version

The furnace outlasts the homeowner's memory of who serviced it. A card a year closes that gap for a few dollars a household. When it finally quits on a cold night, be the name on the refrigerator. The designs we pick for the trades are on our page for HVAC, plumbing and home services.