Built to stay

A heat pump that is sized correctly and installed by someone who knew what they were doing should run for fifteen years without drama. With a little attention, twenty. We have seen well-cared-for units pushing twenty-five, mostly in milder climates and on light duty cycles.

What follows is the honest picture of what those years actually look like.

Years one through five

Almost nothing. The system runs. The filter on the indoor head gets pulled, vacuumed, and slid back in twice a year, which is a five-minute job and not a maintenance call. The outdoor coil collects leaves and grass clippings; a hose-down once a year keeps it clear. That is the entire homeowner-side maintenance for the first five years of a good install.

If the contractor is local and reputable, they will offer a yearly tune-up plan at a couple of hundred dollars a year. It is optional. It involves a technician checking refrigerant pressures, electrical connections, drainage, and airflow. On a healthy system, the tune-up confirms that everything is fine and recommends nothing. It is worth keeping in the first five years mostly to establish a service relationship for when you need one later. After that, every other year is enough.

Years six through ten

A small failure or two is realistic. A capacitor in the outdoor unit, which is a fifty-dollar part and a forty-five-minute service call. A condensate pump that wears out, which is similar. A control board on a multi-zone system, which is more like four hundred dollars. These are normal aging items, not signs of a bad install. A good service tech replaces them and the system goes another five years.

The refrigerant should not need to be topped up. A system that loses refrigerant has a leak, which needs to be found and fixed, not refilled. A technician who suggests “adding some refrigerant” without locating the leak is a technician to replace. The refrigerant is a closed loop, not a consumable.

In year eight to ten, on heavy-use systems in cold climates, the outdoor unit’s compressor may show signs of slowing. This is the equivalent of the engine on a high-mileage car. It is not failure. It is age. If the system is still keeping up with the load, leave it alone.

Years eleven through fifteen

This is the window in which decisions get made. A compressor failure in this range is realistic, and the cost of the repair is high enough that it is worth comparing against the cost of replacing the whole outdoor unit. The honest service company will tell you the math. A new outdoor unit, paired with the existing indoor heads, is a common refresh that restores the system without the full cost of a new install. The lines, the heads, and the wiring are usually fine.

A whole-system replacement, in this window, is the right call if the indoor units are also showing their age, if your needs have changed (a renovation, an addition, a different zone strategy), or if the new equipment available is materially better than what you have. Often it is. The category has moved meaningfully since 2015, and will keep moving.

What makes a system last

Three things, mostly. The sizing was correct, so the system runs at modulation rather than maxed out. The install was clean, so the refrigerant did not leak and the airflow was not constrained. The filters got changed. That is it. The cars-and-mileage saying applies. The way you treat it in the first month sets the pattern for the next fifteen years.

A heat pump is a long, quiet relationship. Done well, it is one of the calmest pieces of equipment you will ever own.