Repair or Replace? How We Think About It

Something failed, you have a repair number in hand, and you want to know whether to spend it or put the money toward a new system.

Here is the framework we use, roughly in priority order.

Is it safe to keep running

This overrides everything.

A cracked heat exchanger on a gas or oil furnace is not repairable on residential equipment, and it is a carbon monoxide risk. A boiler with a compromised pressure vessel is not something to nurse along. If a technician condemns equipment on a safety basis, ask them to show you the evidence, and if it is there, replace it.

Everything below this line assumes the equipment is safe.

What fraction of a replacement is the repair

The common rule of thumb: if the repair costs more than about a third of a replacement and the unit is past two thirds of its expected life, replacement usually wins.

It is a decent starting frame. Where it fails is at the extremes.

A four hundred dollar repair on a fifteen year old furnace is worth doing even though the furnace is old, because four hundred dollars does not move you meaningfully toward a new system and it might buy three more years.

A repair equal to half the cost of new equipment, on a unit at the end of its life, is almost never worth it, because you are paying half price for a machine with an unknown and probably short remaining life.

Is this the first failure or the fourth

Failures cluster at the end of equipment life, because everything in the machine aged at the same rate. The capacitor, the motor, the board, the coil.

One repair in a decade is normal maintenance. Three in two years is the equipment telling you something, and each individual repair looks reasonable in isolation while the total does not.

Add up what you have spent in the last three years. People consistently underestimate this because the calls are spread out and each one felt small at the time.

What is it costing to run

An older system running at seventy or eighty percent efficiency against a modern one in the nineties is a real annual difference over a New Hampshire heating season.

We will not print a payback number, because it depends on fuel prices, your house, and your usage. But bring twelve months of bills and we can do the arithmetic with your actual numbers.

Note this cuts both ways. On a system you barely run, efficiency gains are small and the repair usually wins.

How long are you staying in the house

Frequently decisive and frequently skipped.

Selling in two years: a new system does not return its cost at closing, though a dead one absolutely costs you at inspection. Repair, generally.

Staying fifteen years: the operating cost difference compounds, and it is also the right moment to ask whether you want the same type of system at all, or whether this is when you get off oil.

Is the part even available

On older equipment this becomes the deciding factor without anybody planning for it. Control boards get discontinued. Coils for obsolete refrigerants get expensive and scarce.

If a repair depends on a part with a long lead time in January, the practical answer may be replacement regardless of what the math says, because you need heat this week.

The refrigerant question

For cooling equipment and heat pumps, ask what refrigerant it uses. Older refrigerants are being phased down, and as supply tightens, the cost of a repair that involves recharging climbs. A significant refrigerant repair on equipment using a phased down refrigerant is often the moment to replace rather than the moment to repair.

The one piece of advice I give everybody

Replace on your schedule, not on the equipment’s.

The worst possible time to buy a heating system is the coldest week of the year when yours just died. You are making a large decision under pressure, from whoever can get there fastest, with no time to get comparison quotes or think about whether a different system type would serve you better. You will pay more and you will have fewer options.

So if your equipment is past fifteen years and a technician has flagged concerns, start the process in the fall or the spring. Get quotes. Decide what you would do. Then either replace it deliberately, or run it another season knowing exactly what your plan is when it quits.

That single habit saves our customers more money than any efficiency rating.

What we do on a service call

If we can fix it and it makes sense to fix it, we fix it. If we think you are throwing money at something near the end, we say so, and we will tell you what we would do if it were our house.

We are not going to condemn working equipment to sell you a system. If yours has years left, we would rather tell you that and be the ones you call when it does not.