Furnace & AC Tune-Ups

Why yearly maintenance matters

A furnace in the Hamilton area runs from October to April, often thousands of hours a season, and most of what goes wrong with it starts small. A flame sensor slowly coats over. A condensate trap fills with sludge. A blower wheel collects dust until it moves less air. Furnace maintenance in Hamilton is the visit that catches those before they turn into a no-heat call on the coldest night of the year, and it is the one time each year a trained person looks at the parts that keep combustion gases out of the house.

There is also a paperwork reason. Many furnace and air conditioner manufacturers make their parts warranty conditional on proper installation and regular maintenance. If a heat exchanger or compressor fails at year eight, the first question may be whether the unit was serviced.

What a proper furnace tune-up checks

• Heat exchanger inspected for cracks, rust or signs of overheating.
• Burners cleaned and the flame checked; flame sensor cleaned; igniter inspected.
• Gas pressure measured and adjusted to the manufacturer’s setting.
• Venting checked for blockages, sags and loose joints, inside and out.
• Condensate trap and drain cleaned and flushed.
• Blower wheel and motor checked, and the temperature rise across the furnace measured.
• Safety controls tested: limit switch, pressure switch, rollout switches.
• Filter checked or replaced, and the thermostat confirmed to be calling properly.

A quick visit that only swaps the filter and vacuums the cabinet is not a tune-up. Ask what is on the checklist before you book, and ask for the readings afterwards.

And for an air conditioner or heat pump

In spring, the outdoor unit gets its own visit. The technician cleans the condenser coil, which collects cottonwood fluff, grass and dust through a Hamilton summer, checks the refrigerant pressures and temperatures, tests the capacitor and contactor, and makes sure the condensate line from the indoor coil drains freely. A heat pump runs all year, so it benefits from service in the fall as well, with the defrost cycle tested before winter.

What you can do yourself

The most useful thing a homeowner can do is change the filter on schedule. A 1-inch filter usually needs changing every one to three months; a deeper 4- or 5-inch media filter every six to twelve. Our guide on how often to change a furnace filter has the details. Keep the area around the furnace clear, keep the outdoor AC unit free of leaves and snow drifts, and, on a high-efficiency furnace, keep snow away from the two white vent pipes outside.

Are maintenance plans worth it?

Many contractors and the big rental companies offer plans that bundle a yearly tune-up with discounts, priority booking or parts and labour coverage. A plan that only covers the tune-up and a discount usually costs about what booking the visit yourself would. Plans that cover repairs can be worth it on an older system, but read what is excluded: heat exchangers, ductwork, and "wear and tear" are common carve-outs. Ask whether the plan renews automatically and what it costs to cancel.

When to book

Book furnace maintenance in September or October, before the first cold snap fills every contractor’s schedule, and AC maintenance in April or May. If a furnace has not been serviced in several years, book it now regardless; there is no point waiting for the season.

What the readings tell you

Ask the technician to leave the numbers, not just a tick on a form: the gas pressure, the temperature rise across the furnace, the flame sensor reading and, on the air conditioner, the refrigerant pressures and the temperature drop across the coil. Kept year to year, they show a part slowly drifting before it fails. A temperature rise creeping up, for example, often means a dirty blower or a restrictive filter, and a falling refrigerant pressure points to a slow leak worth finding before a hot July weekend.

How the request works

You request a tune-up once, and we pass it to one licensed contractor who works your area. They call to book a time. If they find something that needs repair, they quote it before doing anything. If the furnace is old, ask them to say how much life they think is left; the furnace lifespan guide explains what they will look at.